I have made a "computer". My conctructor looks like this:
PC::PC()
{
cout << "Would you like to turn the pc on? type y for yes." << endl;
a = getchar();
while (a != 'y')
{
cout << "If you dont turn it on, then nothing will happen. Loser." << endl;
a = getchar();
}
}
Then if you press y you will be sent to the next step which is the function PC::pcOn which looks like this:
void PC::pcOn()
{
for (auto i = 0; i < 3; i++)
{
cout << "----------------------------------------" << endl;
}
cout << "--------- What is your name? -----------" << endl;
changeName();
for (auto i = 0; i < 3; i++)
{
cout << "----------------------------------------" << endl;
}
for (auto i = 0; i < 5; i++)
{
cout << "**" << endl;
Sleep(100);
}
cout << "Welcome " << name << " to the future of computing." << endl << endl;
cout << "This computer program can do a lot of things for you" << endl << "it is a good calculator, try to type \"calculater\"" << endl;
}
However when i have the while loop in the contructor to get the y to go on, the changeName(); wont work, but if i remove that, the changeName function works just fine, and it takes my input just fine.
The code for the changeName() looks like this:
void PC::changeName()
{
string _name;
getline(cin, _name);
name = _name;
}
I have tried using the Visual Studio's debugger to see why i wont call it correctly, but alas to no hope.
The weird thing is, that the function works fine if the while loop in the constructor is not there.
It is because in getline(cin, _name), it always inputs the "/n" character as it is feeded when you type enter.
To correct it, put a getchar();
void PC::changeName()
{
string _name;
getchar();
getline(cin, _name);
name = _name;
}
You need to flush cin before calling changeName(), this can be done using
int c;
while ((c = getchar()) != '\n' && c != EOF);
Related
I asked this question a couple of hours ago; I want to see if someone can now explain the problem.
One code is about separating items in a grocery; in the end you'll have two(2) bags; a fragileBag and a normalBag.
Other code separates passengers depending on the office they go for pickup; in the end you'll have three(3) types of passengers; ones that go to rio, ones that go to maya, and ones that request elsewhere.
Both codes use the same logic but the passenger code gives an error on a line that works perfectly on the grocery code.
Just to be clear, BOTH CODES RETURN VALUES OF STRING.
ERROR FROM THE PASSENGER CODE:
Error (active) E0304 no instance of overloaded function "std::vector<_Ty,_Alloc>::push_back [with _Ty=trans, _Alloc=std::allocator<trans>]" matches the argument list dataPractice2 C:\Users\javye\source\repos\dataPractice2\dataPractice2\main.cpp 82
and also:
Error C2664 'void std::vector<trans,std::allocator<_Ty>>::push_back(_Ty &&)': cannot convert argument 1 from 'std::string' to 'const _Ty &' dataPractice2 c:\users\javye\source\repos\datapractice2\datapractice2\main.cpp 82
//GROCERY FUNCTION
//separate function
void separateItems(vector<myBag>& newMyVector) {
for (int x = newMyVector.size() - 1; x >= 0; --x) {
if (newMyVector[x].getItem() == "eggs" || newMyVector[x].getItem() == "bread") {
fragileBag.push_back(newMyVector[x].getItem()); //NO PROBLEM HERE
newMyVector.pop_back();
}
else {
normalBag.push_back(newMyVector[x].getItem()); //OR HERE
newMyVector.pop_back();
}
}
}
//PASSENGER FUNCTION
//separate function
void separateP(vector<trans>& newMyVector) {
for (int x = newMyVector.size() - 1; x >= 0; --x) {
if (newMyVector[x].getXoLoc() == "rio") {
rioLoc.push_back(newMyVector[x].getXoLoc()); //PROBLEM HERE
newMyVector.pop_back();
}
else
if (newMyVector[x].getXoLoc() == "maya") {
mayaLoc.push_back(newMyVector[x].getXoLoc()); //HERE
newMyVector.pop_back();
}
else
elseLoc.push_back(newMyVector[x].getXoLoc()); //HERE
newMyVector.pop_back();
}
}
//GROCERY FULL CODE
//HEADER
#pragma once
#include<iostream>
#include<vector>
#include<string>
using namespace std;
#ifndef BAG_H
#define BAG_H
class myBag {
public:
myBag(); //default constructor
myBag(string anItemName); //overload constructor
void addItem(string anItemName); //mutator
string getItem();//accessor
private:
string itemName;
};
#endif
//SOURCE
#include"bag.h"
myBag::myBag() {
addItem("");
}
myBag::myBag(string anItemName) {
addItem(anItemName);
}
void myBag::addItem(string anItemName) {
itemName = anItemName;
}
string myBag::getItem() {
return itemName;
}
//MAIN
#include"bag.h"
void inputItems(vector<myBag>&); //input data function prototype
void displayQuantity(vector<myBag>&); //display data function prototype
void separateItems(vector<myBag>&); //function that separates items; func prototype
void fragBag(vector<myBag>&); //fragile bag function prototype
void norBag(vector<myBag>&); //normal bag function prototype
vector<myBag> myVector; //main vector
vector<myBag> fragileBag, normalBag; //seconday vectors
string item; //global item variable
int main() {
int option;
try {
do {
cout << "\tMENU"
<< endl << "1) Input Items"
<< endl << "2) Display Quantity"
<< endl << "3) Separate (IMPORTANT)"
<< endl << "4) Display Items in Fragile Bag"
<< endl << "5) Display Items in Normal Bag"
<< endl << "6) Exit Program"
<< endl << endl << "Choose: ";
cin >> option;
if (option > 6) {
throw 404;
}
switch (option) {
case 1: //input
system("cls");
inputItems(myVector);
system("pause");
system("cls");
break;
case 2://display
system("cls");
displayQuantity(myVector);
system("pause");
system("cls");
break;
case 3: //separate
system("cls");
separateItems(myVector);
system("pause");
system("cls");
break;
case 4: //fragile
system("cls");
fragBag(myVector);
system("pause");
system("cls");
break;
case 5: //normal
system("cls");
norBag(myVector);
system("pause");
system("cls");
break;
case 6: //exit
exit(0);
}
} while (option != 6);
}
catch(int x){
cout << "ERROR, OPTION DOESN'T EXITS" << endl;
system("pause");
}
}
//input function
void inputItems(vector<myBag>& newMyVector) {
do {
cout << "Enter grocery items || enter letter X to stop: ";
cin >> item;
if (item != "x")
newMyVector.push_back(myBag(item));
} while (item != "x");
}
//display function
void displayQuantity(vector<myBag>& newMyVector) {
try {
for (int x = 0; x < newMyVector.size(); ++x) {
if (x == 0) {
cout << "Store bag has " << newMyVector.size() << " items in it. These are: " << endl;
}
cout << newMyVector[x].getItem() << endl;
}
if (newMyVector.empty())
throw 404;
}
catch (int x) {
cout << "ERROR " << x << " ,QUANTITY NOT FOUND" << endl;
}
}
//separate function
void separateItems(vector<myBag>& newMyVector) {
for (int x = newMyVector.size() - 1; x >= 0; --x) {
if (newMyVector[x].getItem() == "eggs" || newMyVector[x].getItem() == "bread") {
fragileBag.push_back(newMyVector[x].getItem()); //PROBLEM WOULD APPEAR HERE, BUT DOESN'T, UNLIKE THE OTHER CODE
newMyVector.pop_back();
}
else {
normalBag.push_back(newMyVector[x].getItem());
newMyVector.pop_back();
}
}
}
//fragile bag function
void fragBag(vector<myBag>& newMyVector) {
try {
for (int x = 0; x < fragileBag.size(); ++x) {
if (x == 0) {
cout << "The fragile bag has " << fragileBag.size() << " items in it. These are: " << endl;
}
cout << fragileBag[x].getItem() << endl;
}
if (fragileBag.empty()) {
throw 404;
}
}
catch (int x) {
cout << "ERROR " << x << " ,FRAGILE BAG EMPTY" << endl;
}
}
//normal bag function
void norBag(vector<myBag>& newMyVector) {
try {
for (int x = 0; x < normalBag.size(); ++x) {
if (x == 0) {
cout << "The normal bag has " << normalBag.size() << " items in it. These are: " << endl;
}
cout << normalBag[x].getItem() << endl;
}
if (normalBag.empty()) {
throw 404;
}
}
catch (int x) {
cout << "ERROR " << x <<" , NORMAL BAG EMPTY" << endl;
}
}
//PASSENGER FULL CODE
//HEADER
#pragma once
#include<iostream>
#include<vector>
#include<string>
using namespace std;
#ifndef TRANSPORT_H
#define TRANSPORT_H
class trans {
public:
trans();
trans(string aName, string anXoLoc, string anXfLoc, string aTime, string aCellNum);
void setName(string aName);
void setXoLoc(string anXoLoc);
void setXfLoc(string anXfLoc);
void setTime(string aTime);
void setCellNum(string aCellNum);
string getName();
string getXoLoc();
string getXfLoc();
string getTime();
string getCellNum();
private:
string name;
string xoLoc; //offices
string xfLoc; //destination
string time;
string cellNum;
};
//SOURCE
#include"transport.h"
trans::trans() {
setName("");
setXoLoc("");
setXfLoc("");
setTime("");
setCellNum("");
}
trans::trans(string aName, string anXoLoc, string anXfLoc, string aTime, string aCellNum) {
setName(aName);
setXoLoc(anXoLoc);
setXfLoc(anXfLoc);
setTime(aTime);
setCellNum(aCellNum);
}
void trans::setName(string aName) {
name = aName;
}
void trans::setXoLoc(string anXoLoc) {
xoLoc = anXoLoc;
}
void trans::setXfLoc(string anXfLoc) {
xfLoc = anXfLoc;
}
void trans::setTime(string aTime) {
time = aTime;
}
void trans::setCellNum(string aCellNum) {
cellNum = aCellNum;
}
string trans::getName() {
return name;
}
string trans::getXoLoc() {
return xoLoc;
}
string trans::getXfLoc() {
return xfLoc;
}
string trans::getTime() {
return time;
}
string trans::getCellNum() {
return cellNum;
}
#endif
//MAIN
#include"transport.h"
void inputInfo(vector<trans> &);
void displayInput(vector<trans>&);
void separateP(vector<trans>&);
void rio(vector<trans>&);
void maya(vector<trans>&);
void elsewhere(vector<trans>&);
vector<trans> myVector;
vector<trans> rioLoc, mayaLoc, elseLoc;
string newName;
string newXoLoc; //offices
string newXfLoc; //destination
string newTime;
string newCellNum;
//main not ready. Creating each function one by one to them make it look nice
int main() {
int option;
do {
cout << "MENU"
<< endl << "1) input "
<< endl << "2) output "
<< endl << "3) separate"
<< endl << "4) rio passengers"
<< endl << "5) maya passengers"
<< endl << "6) elsewhere passengers";
cin >> option;
switch(option){
case 1:
inputInfo(myVector);
break;
case 2:
displayInput(myVector);
break;
case 3:
separateP(myVector);
break;
case 4:
rio(myVector);
break;
case 5:
maya(myVector);
break;
case 6:
elsewhere(myVector);
break;
case 7:
exit(0);
}
} while (option != 7);
system("pause");
}
void inputInfo(vector<trans> &newMyVector) {
int charSize;
cout << "How many passangers to register: ";
cin >> charSize;
for (int x = 0; x < charSize; ++x) {
cout << "Name of passanger: ";
cin >> newName;
cout << "Office: ";
cin >> newXoLoc;
cout << "Destination: ";
cin >> newXfLoc;
cout << "Time of pickup: ";
cin >> newTime;
cout << "Cellphone: ";
cin >> newCellNum;
if (charSize != 0)
newMyVector.push_back(trans(newName, newXoLoc, newXfLoc, newTime, newCellNum));
}
}
void displayInput(vector<trans>& newMyVector) {
for (int x = 0; x < newMyVector.size(); ++x) {
if (x == 0) {
cout << "There are " << newMyVector.size() << " passengers. These are: " << endl;
}
cout << "-----------------------------Passenger #" << x + 1 << endl;
cout << newMyVector[x].getName() << endl;
cout << newMyVector[x].getXoLoc() << endl;
cout << newMyVector[x].getXfLoc() << endl;
cout << newMyVector[x].getTime() << endl;
cout << newMyVector[x].getCellNum() << endl;
}
}
void separateP(vector<trans>& newMyVector) {
for (int x = newMyVector.size() - 1; x >= 0; --x) {
if (newMyVector[x].getXoLoc() == "rio") {
rioLoc.push_back(newMyVector[x]);
newMyVector.pop_back();
}
else
if (newMyVector[x].getXoLoc() == "maya") {
mayaLoc.push_back(newMyVector[x]);
newMyVector.pop_back();
}
else
elseLoc.push_back(newMyVector[x]);
newMyVector.pop_back();
}
}
void rio(vector<trans>& newMyVector) {
for (int x = 0; x < rioLoc.size(); ++x) {
if (x == 0) {
cout << "Num. of passangers to pickup in Rio Piedras is " << rioLoc.size() << " , these are: " << endl;
}
cout << rioLoc[x].getName() << endl;
cout << rioLoc[x].getXoLoc() << endl;
cout << rioLoc[x].getXfLoc() << endl;
cout << rioLoc[x].getTime() << endl;
cout << rioLoc[x].getCellNum() << endl;
}
}
void maya(vector<trans>& newMyVector) {
for (int x = 0; x < mayaLoc.size(); ++x) {
if (x == 0) {
cout << "Num. of passangers to pickup in Mayaguez is " << mayaLoc.size() << " , these are: " << endl;
}
cout << mayaLoc[x].getName() << endl;
cout << mayaLoc[x].getXoLoc() << endl;
cout << mayaLoc[x].getXfLoc() << endl;
cout << mayaLoc[x].getTime() << endl;
cout << mayaLoc[x].getCellNum() << endl;
}
}
void elsewhere(vector<trans>& newMyVector) {
for (int x = 0; x < elseLoc.size(); ++x) {
if (x == 0) {
cout << "Num. of passangers to pickup in elsewhere is " << elseLoc.size() << " , these are: " << endl;
}
cout << elseLoc[x].getName() << endl;
cout << elseLoc[x].getXoLoc() << endl;
cout << elseLoc[x].getXfLoc() << endl;
cout << elseLoc[x].getTime() << endl;
cout << elseLoc[x].getCellNum() << endl;
}
}
To explain why the second code does not work I first have to explain why the first code appears to work.
myBag::myBag(string anItemName)
can make a bag out of a string. It is a Conversion Constructor. So when
fragileBag.push_back(newMyVector[x].getItem());
is compiled, the compiler quietly inserts a call to the myBag(string) constructor and you get something more like
fragileBag.push_back(myBag(newMyVector[x].getItem()));
which makes no sense logically. It says turn an item in a bag into a bag with one item and insert this new bag into still another bag, fragileBag.
When you look more closely at myBag, you see that it isn't a bag at all. It is a single item and should be renamed to myItem or discarded all together in favour of an all-new all-different myBag that is a wrapper around a vector of string where the strings represent items. This makes
myBag fragileBag;
the real bag.
In other words, the only reason the working code works is it doesn't actually do what the naming implies it does. The code compiles and produces the expected result, but is semantically troubled.
This leads to the confusion with
rioLoc.push_back(newMyVector[x].getXoLoc());
rioLoc is a vector<trans> and can only hold trans. There is no trans::trans(string) to convert a string to a trans so the faulty logic of the grocery code is exposed. As bag and item have been intertwined in grocery, passenger and transport are combined here.
The fix for grocery described above is relatively straight forward. Passenger will need a slightly different solution with both a passenger class to describe the passengers and a transport class to describe the means of transport. transport will have a vector<passenger> member to contain its passengers as well as methods to add and remove the passengers and possibly book-keeping to track the location of the transport, details incompletely specified by the question.
Both codes are pushing string values into a vector that does not hold string values.
Your grocery code uses a vector of myBag objects. The code works because myBag has a non-explicit constructor that takes a single string as input, so the compiler is able to implicitly construct a temporary myBag object to push into the vector.
Your passenger code uses a vector of trans objects. The code fails because trans does not have a constructor that takes a single string as input, so the compiler cannot construct a temporary trans to push into the vector.
I've been working on a simple console application and was stopped when, upon compiling my latest code, it began outputting strings of text and integers which did not match what I have entered.
The purpose of the program thus far is simple: to input a string of data and for it to output correctly multiple times in the console application. Below I have linked the pseudocode.
Thanks in advance.
#include <iostream>
#include <string>
void printIntro();
void RunApp();
bool RequestRestart();
std::string GetAttempt();
int main() // entry point of the application
{
printIntro();
RunApp();
RequestRestart();
return 0;
}
void printIntro() {
// introduce the program
constexpr int WORD_LENGTH = 8; // constant expression
std::cout << "Welcome to the Bull and Cow guessing game\n";
std::cout << "Can you guess the " << WORD_LENGTH;
std::cout << " letter isogram I am thinking of?\n\n";
return;
}
void RunApp()
{
// loop for number of attempts
constexpr int ATTEMPTS = 5;
for (int count = 1; count <= ATTEMPTS; count++)
{
std::string Attempt = GetAttempt();
std::cout << "You have entered " << GetAttempt << "\n";
std::cout << std::endl;
}
}
std::string GetAttempt()
{
// receive input by player
std::cout << "Enter your guess: \n";
std::string InputAttempt = "";
std::getline(std::cin, InputAttempt);
return InputAttempt;
}
bool RequestRestart()
{
std::cout << "Would you like to play again?\n";
std::string Response = "";
std::getline(std::cin, Response);
std::cout << "Is it y?: \n" << (Response[0] == 'y'); //response must be in brackets
return false;
}
You have to change this line
std::cout << "You have entered " << GetAttempt << "\n";
instd::cout << "You have entered " << Attempt << "\n";
In this way you do not print the address of the function, just like you did before, but the variable in which you stored the return value of the GetAttempt function.
You are printing a pointer to GetAttempt. Instead print Attempt:-
std::cout << "You have entered " << Attempt << "\n";
#include <iostream>
#include <string>
#include <cstdlib>
#include <ctime>
using namespace std;
void armySkirmish();
void battleOutcome();
string commander = "";
int numberOfHumans = 0;
int numberOfZombies = 0;
class ArmyValues
{
protected:
double attackPower;
double defensePower;
double healthPoints;
public:
void setAttackPower(double a)
{
attackPower = a;
}
void setDefensePower(double d)
{
defensePower = d;
}
void setHealthPoints(double h)
{
healthPoints = h * (defensePower * .1);
}
};
class Zombies: public ArmyValues
{
};
class Humans: public ArmyValues
{
};
int main(int argc, char ** argv)
{
cout << "Input Commander's Name: " << endl;
cin >> commander;
cout << "Enter Number of Human Warriors: " << endl;
cin >> numberOfHumans;
cout << "Enter Number of Zombie Warriors: " << endl;
cin >> numberOfZombies;
armySkirmish();
battleOutcome();
return 0;
}
void armySkirmish()
{
cout << "\nThe Humans tense as the sound of the undead shuffle towards them." << endl;
cout << commander << " shuffles forward with a determined look." << endl;
cout << "The undead form up into ranks and growl a war chant!" << endl;
cout << commander <<" shouts, CHARGE!!!" << endl;
cout << endl;
cout << "Warriors from both sides blitz across the field!" << endl;
cout << endl;
cout << "*The Carnage has begun!*" << endl;
cout << "*Steal, Sparks, and Flesh flies" << endl;
}
void battleOutcome()
{
int zombieLives = numberOfZombies;
int humanLives = numberOfHumans;
int randomNumber = 0;
int humanDeath = 0;
int zombieDeath = 0;
double newHumanLife = 0;
double newZombieLife = 0;
Zombies zombieBattleData;
Humans humanBattleData;
srand(time(NULL));
zombieBattleData.setAttackPower(20.0);
humanBattleData.setAttackPower(35.0);
zombieBattleData.setDefensePower(15.0);
humanBattleData.setDefensePower(20.0);
zombieBattleData.setHealthPoints(150.0);
humanBattleData.setHealthPoints(300.0);
while(zombieLives && humanLives > 0)
{
randomNumber = 1+(rand()%10);
if(randomNumber < 6)
{
newHumanLife = humanBattleData.healthPoints - zombieBattleData.attackPower;
if(newHumanLife <= 0)
{
humanLives--;
humanDeath++;
}
}else
{
newZombieLife = zombieBattleData.healthPoints - humanBattleData.attackPower;
if(newZombieLife <= 0)
{
zombieLives--;
zombieDeath++;
}
}
}
if(zombieLives <= 0)
{
cout << "Humans have emerged victorious!" << endl;
cout << "Human Deaths: " << humanDeath << "Zombie Deaths: " << zombieDeath << endl;
}else if(humanLives <= 0)
{
cout << "Zombies have emerges victorious!" << endl;
cout << "Human Deaths: " << humanDeath << "Zombie Deaths: " << zombieDeath << endl;
}
I know the code wont run properly as of now. What I was doing was a test run to make sure I was receiving no errors. The two errors I'm getting are:
armySimulatorMain.cpp:25:10: error: 'double ArmyValues::healthPoints' is protected
armySimulatorMain.cpp:115:67: error: within this context.
newHumanLife = humanBattleData.healthPoints - zombieBattleData.attackPower;
This is the case for Attack Power and Health Power however, Defense power is clearing the errors. i don't understand why they are getting flagged. I'm changing the variable through the public function so shouldn't this be allowed?
Also, I'm calling three variables outside of all functions because they are being used by multiple functions. How can I plug those variables somewhere I don't like that they are floating freely above everything?
Thanks guys I can't believe I forgot about getters... Anyway the code runs now much appreciated I'll make sure to remember this time xD
It's not complaining about the line where you set the values; as you say, that uses a public function. But here, you try to read the protected member variables:
newHumanLife = humanBattleData.healthPoints - zombieBattleData.attackPower;
You only try to read two variables, and those are the ones it complains about.
You'll need a public getter function to read the values.
You need to do something like:
public:
double gethealthPoints()
{
return healthPoints;
}
because attackPower, defensePower, healthPoints are all protected, so if you want to access to any of them you need a getter, otherwise you will always receive an protect error
I am trying to load a text file and import the contents into a vector of structs.
Here are my definitions
typedef struct
{
string pcName, pcUsername, pcPassword, pcMessage, pcAdvertisement; //I know that
//this is incorrect convention. It was originally a char*
}
ENTRY;
vector<ENTRY> entries;
fstream data;
Here is my display data function
void DisplayData()
{
std::cout << (int)(entries.size() / 5) <<" entries" << endl;
for(int i = 1; i <=(int)entries.size()/5; i++)
{
cout << endl << "Entry " << i << ":" << endl
<< "Name: " << entries[i].pcName << endl
<< "Username: " << entries[i].pcUsername << endl
<< "Password: " << entries[i].pcPassword << endl
<< "Message: " << entries[i].pcMessage << endl
<< "Advertisement: " << entries[i].pcAdvertisement << endl;
}
}
and here is my Load Data function
bool LoadData(const char* filepath)
{
std::string lineData ;
int linenumber = 1 ;
data.open(filepath, ios::in);
ENTRY entry_temp;
if(!data.is_open())
{
cerr << "Error loading file" << endl;
return false;
}
while(getline(data, lineData))
{
if(linenumber==1) {entry_temp.pcName = lineData;}
else if(linenumber==2) {entry_temp.pcUsername = lineData;}
else if(linenumber==3) {entry_temp.pcPassword = lineData;}
else if(linenumber==4) {entry_temp.pcMessage = lineData;}
else if(linenumber==5) {entry_temp.pcAdvertisement = lineData;}
entries.push_back(entry_temp);
if(linenumber == 5)
{
linenumber = 0;
}
linenumber++;
}
data.close();
puts("Database Loaded");
return true;
}
Here is the text file I am loading:
Name1
Username1
Password1
Message1
Ad1
And here is the result of the display data function after calling load data:
1 entries
Entry 1:
Name: Name1
Username Username1
Password:
Message:
Advertisement:
As you can see, the first two load but the last three don't. When I did this with an array instead of a vector, it worked fine so I don't know what I'm doing wrong. Thanks.
I suggest that you read each line directly into the data field where it goes:
getline(data, entry_temp.pcName);
getline(data, entry_temp.pcUsername);
getline(data, entry_temp.pcPassword);
getline(data, entry_temp.pcMessage);
getline(data, entry_temp.pcAdvertisement);
entries.push_back(entry_temp);
This makes your intent much clearer than your current while loop. It also creates a single entry for all 4 input lines rather than one for each input line (with the other three blank). Now you can read several "entries" by using a while loop that checks if you have reached the end of the file.
Doing this will also make printing out the data much easier since the vector will have exactly the number of entries rather than five times as many as you expect (which also eats up a lot more memory than you need to).
Your DisplayData function is a little weird, and so is your LoadData.
Your LoadData pushes back a new copy of the current ENTRIES entry with every line. Your DisplayData starts at 1 (which is not the beginning of any vector or array), and iterates only up to the 1/5th entry of the entire vector.
This needs a heavy rework.
First, the size() member of any standard container returns the number of elements that it contains, and will not take the number of fields in a contained struct into account.
For future reference, you'll want to post your question in a complete, standalone example that we can immediately compile to help. (see http://sscce.org/)
Try this modified data, which runs correctly, and see if you can tell what is being done differently:
#include <iostream>
#include <fstream>
#include <vector>
#include <string>
using namespace std;
typedef struct
{
string pcName, pcUsername, pcPassword, pcMessage, pcAdvertisement;
}
ENTRY;
vector<ENTRY> entries;
fstream data;
bool LoadData(const char* filepath)
{
std::string lineData ;
int linenumber = 1 ;
data.open(filepath, ios::in);
ENTRY entry_temp;
if(!data.is_open())
{
cerr << "Error loading file" << endl;
return false;
}
while(getline(data, lineData))
{
if(linenumber==1) {entry_temp.pcName = lineData;}
else if(linenumber==2) {entry_temp.pcUsername = lineData;}
else if(linenumber==3) {entry_temp.pcPassword = lineData;}
else if(linenumber==4) {entry_temp.pcMessage = lineData;}
else if(linenumber==5) {entry_temp.pcAdvertisement = lineData;}
if(linenumber == 5)
{
entries.push_back(entry_temp);
linenumber = 0;
}
linenumber++;
}
data.close();
puts("Database Loaded");
return true;
}
void DisplayData()
{
std::cout << entries.size() <<" entries" << endl;
for(int i = 0; i < entries.size(); i++)
{
cout << endl << "Entry " << i << ":" << endl
<< "Name: " << entries[i].pcName << endl
<< "Username: " << entries[i].pcUsername << endl
<< "Password: " << entries[i].pcPassword << endl
<< "Message: " << entries[i].pcMessage << endl
<< "Advertisement: " << entries[i].pcAdvertisement << endl;
}
}
int main()
{
LoadData("/tmp/testdata");
DisplayData();
return (0);
}
While I think #code-guru has the right idea, I'd take the same idea just a little further, and make your code work a little more closely with the standard library. I'd do that by reading a data item with a stream extractor, and displaying it with stream inserter. So, the extractor would look something like this:
std::istream &operator>>(std::istream &is, ENTRY &e) {
getline(is, e.pcName);
getline(is, e.pcUsername);
getline(is, e.pcPassword);
getline(is, e.pcMessage);
getline(is, e.pcAdvertisement);
return is;
}
..and the inserter would look something like this:
std::ostream &operator<<(std::ostream &os, ENTRY const &e) {
os << e.pcName << "\n";
os << e.pcUsername << "\n";
os << e.pcPassword << "\n";
os << e.pcMessage << "\n";
os << e.pcAdvertisement << "\n";
return os;
}
With those in place, loading and displaying the data becomes fairly straightforward.
Load the data:
std::ifstream in("yourfile.txt");
std::vector<ENTRY> data((std::istream_iterator<ENTRY>(in)),
std::istream_iterator<ENTRY>());
Display the data:
for (auto const & e: data)
std::cout << e << "\n";
For the moment, I haven't tried to duplicate the format you were using to display the data -- presumably the modifications for that should be fairly obvious.
Im new to programming and C++ and I started making a little string type game for fun, which gives the user two options through out the program, but in the final part of the program i cant get it to output a unique option for the final input(makeCure) - which i only want to output at the end not through out the program. Hope Im making sense :/ .Iv tried and tried and tried and the more i try the more probloms I create. Iv shown below in my code where Im sure the problom lies. Any advice would much appreciated.
#include<iostream>
#include<string>
using std::string;
bool intro(void);
void room(bool enemy, bool data, bool cure, string description);
//player stats
string Name = "";
//enemy states
string enemyName = "";
//data stats
string dataName = "";
//Cure - Option in room7 only
string makeCure = "";
//room descriptions(string constructs)
const string room1 = "You enter the first town of infected Zombies.";
const string room2 = "You are overwelmed by Zombies, and plunder into the sewers to escape.";
const string room3 = "You make your way to safety and find yourself in the Central Town Hall.";
const string room4 = "You decide to venture into the local forest to find the finalingrediants";
const string room5 = "You venture further for the final ingrediant, into a nearby Cave.";
const string room6 = "Its time for you to face the Zombie General!!!";
const string room7 = "You work day and Night in the Labs to make the Cure.";
int main(void)
{
if(intro())
return 0;
dataName = "First Ingrediant- Zombie Rags with infected DNA";
enemyName = "Zombie Soldior";
room(true, true, false, room1);
enemyName = "Massive Zombie Rat";
room(true, false, false, room2);
dataName = "Seconed Ingrediant- StemCells";
enemyName = "Mutated Scientists";
room(true, true, false, room3);
dataName = "Third Magic-Mushrooms";
room(false, true, false, room4);
dataName = "Fourth Final Ingrediant - Coffee Beans";
enemyName = "Commander Zombie";
room(true, true, false, room5);
enemyName = "Zombie General";
room(false, true, false, room6);
return 0;
makeCure = "Elixier to Save the World";
room(false, false, true, room7);
return 0;
}
bool intro(void)
{
using std::cout;
using std::cin;
cout << "Brave Soul!!! What is your name?\n";
cin >> Name;
cout << "Ahh... " << Name << " You say.." << "How about Zombie Slayer?.. Good, glad we agree!\n";
cout << "Humanity is in need of your Help, "
<< "The world is being infected by the\n"
<< "ZD1678 ZOMBIE VIRUS \n"
<< "And we need to send you to Cape Town to stop the central spread.\n"
<< "Your task will be tough, but we know you can do it \n"
<< "Will you accept the challenge?\n\n";
cout << "1)Yes. \n"
<< "2)No. \n\n";
int response;
cin >> response;
return !(response ==1);
}
void room(bool enemy, bool data, bool cure, string description)
{
using std::cout;
using std:: cin;
while(true)
{
cout << description.c_str() << "\n\n";
int response = 0;
do
{
cout << "Shall Our Hero continue his Quest?\n";
if(enemy)
cout << "1) Attack the "
<< enemyName.c_str() << "\n";
else if(!enemy)
cout << "1) venture further....";
if(data)
cout << "2)Pick up the "
<< dataName.c_str() << "\n";
cin >> response;
/* Trying to create the last if that only kicks in at room7( string makeCure )
* that displays the option to make the cure
* This is where my Problem is.
* Iv tried anouther if
* and else
* and while and nothing works, its just messes up everything..
* badly
*/
} while(response < 1 || response > 2);
switch(response)
{
case 1:
if(enemy)
{
enemy = !enemy;
cout << "You slay the deadly "
<< enemyName.c_str() << "\n";
}
else if(!enemy)
return;
break;
case 2:
data = !data;
cout << "You pick up the "
<< dataName.c_str() << "\n";
break;
}
}
}
what you probably want to do is dynamically generate a list of possible events each time you write out the list and present it to the user, then you can match the response to the list to get what the user wants to do. like this:
enum EventType
{
ET_Enemy,
ET_Item,
ET_Cure,
ET_Continue,
ET_MAX
};
void room(bool enemy, bool data, bool cure, string description)
{
using std::cout;
using std:: cin;
int currentEventChoices[ET_MAX];
int numEventChoices;
while(true)
{
cout << description.c_str() << "\n\n";
int response = 0;
do
{
numEventChoices = 0;
cout << "Shall Our Hero continue his Quest?\n";
if(enemy)
{
cout << (numEventChoices+1) << ") Attack the "
<< enemyName.c_str() << "\n";
currentEventChoices[numEventChoices] = ET_Enemy;
numEventChoices++;
}
if(data)
{
cout << (numEventChoices+1) << ") Pick up the "
<< dataName.c_str() << "\n";
currentEventChoices[numEventChoices] = ET_Item;
numEventChoices++;
}
if(cure)
{
cout << (numEventChoices+1) << ") cure related string "
<< makeCure.c_str() << "\n";
currentEventChoices[numEventChoices] = ET_Cure;
numEventChoices++;
}
cout << (numEventChoices+1) << ") venture further....\n"; // note if this is only meant to be an option if there is no enemy, put it in an else after the if(enemy)
numEventChoices++;
cin >> response;
} while(response < 1 || response > numEventChoices);
switch(currentEventChoices[response-1])
{
case ET_Enemy:
enemy = !enemy;
cout << "You slay the deadly "
<< enemyName.c_str() << "\n";
break;
case ET_Item:
data = !data;
cout << "You pick up the "
<< dataName.c_str() << "\n";
break;
case ET_Cure:
//do cure stuff
break;
case ET_Continue:
return;
}
}
}
the trouble you are having is that by just using a very static next of if/else statements each time you want to match the option number to the event, it gets very complex and messy, it was fine when there was just the 4 cases of there being an enemy or not, or data or not. but now you are adding another branch with cure, its just got really complex to do it that way.
It's a bit hard to understand what you need, so tell me if it's not what you wanted.
Using braces and indenting consistently can really help with this:
do {
cout << "Shall Our Hero continue his Quest?\n";
if (enemy) {
cout << "1) Attack the " << enemyName << "\n";
} else {
cout << "1) venture further....";
}
if (data) {
cout << "2) Pick up the " << dataName << "\n";
}
if (cure) {
cout << "2) take the " << makeCure << "\n";
}
cin >> response;
} while (response < 1 || response > 2);
and fix "case 2" in the switch part:
case 2:
if (data) {
data = false;
cout << "You pick up the " << dataName << "\n";
} else if (cure) {
// fill in ...
}
break;
Notes:
You can use endl (from std) instead of '\n'. cout << "hello" << endl;
You can pass many of your global variables as arguments, so you won't need them to be global (global is bad, in general).
Much of your game can be be squeeszed into arrays and structs - being "data driven" and "table driven". I don't know if you got there already, but you can try and identify these parts.
if(enemy) ... else if(!enemy) you don't need the !enemy part. it is implied by the else.