The variable "read" in this program needs to be passed through a function and i don't know what data type it is. I have used http://www.cplusplus.com/reference/fstream/ifstream/ifstream/
and http://www.cplusplus.com/reference/fstream/ifstream/ but I'm struggling to find anything, is this just not possible?
int main()
{
string line = " ", ans = " ", ans2 = " ", data = " ";
int i = 0, j = 0;
cout << "What file do you want to read? : ";
cin >> ans;
cout << "What do you want the new file to be called? : ";
cin >> ans2;
ifstream read(ans.c_str());
for (i = 0; !read.eof(); i++)
{
read_function(line, read);
write_function(line, ans2);
}
return 0;
}
string read_function(string line, string read)
{
getline(read, line, ' ');
cout << line;
}
void write_function(string line, string ans2)
{
ofstream write(ans2.c_str(), ios::app);
write << line;
write.close();
}
You have ifstream read but a function
string read_function(string line, string read)
// ^------
If you change the function to
string read_function(string line, ifstream & read)
// ^------
the read_function then expects a stream as the second parameter, not a string.
You will have a similar problem with the next function.
The comments point out other problems.
If you get an error about types, sit back and look at what you are passing to functions and what they expect.
Related
im a Student and new to this site. I want to split my txt file with my highscore data back to my Highscore List.
The txt file stores my Highscore like name:score
My parsing is not working and i dont know why?
I just want to split it to name and score again and then put it in my HighscoreList.
If you have any question about the code just ask :)
#include "highscore.h"
highscore::highscore(){
}
struct highscore::Player{
string spielerName;
int score;
};
void highscore::writeHighscore(string name, int score ,int playerNumberx){
Player HighscoreListe[100];
for(int i=0;i<=99;i++){
HighscoreListe[i].score = {0};
}
for(int i=0;i<=99;i++){
HighscoreListe[i].spielerName = "leer";
}
HighscoreListe[playerNumberx].spielerName = name;
HighscoreListe[playerNumberx].score = score;
int i, j,temp;
string temp1;
ifstream myfile("scores.txt");
string line;
//heres the point where i need help!!
if (myfile.is_open()){
int z=0;
while(getline(myfile, line)){
string name1;
string score1;
int d = 20;
while(line[z] != ':'){
name1 += line[z];
z++;
}
z = z+2;
while(line[z] != '\0'){
score1 += line[z];
z++;
}
HighscoreListe[d].spielerName = name;
HighscoreListe[d].score = score;
d++;
}
myfile.close();
}else cout << "Unable to open file" << endl;
for(i = 0; i<100; i++) {
for(j = i+1; j<100; j++)
{
if(HighscoreListe[j].score < HighscoreListe[i].score) {
temp = HighscoreListe[i].score;
temp1 = HighscoreListe[i].spielerName;
HighscoreListe[i].score = HighscoreListe[j].score;
HighscoreListe[i].spielerName = HighscoreListe[j].spielerName;
HighscoreListe[j].score = temp;
HighscoreListe[j].spielerName = temp1;
}
}
}
ofstream myfilex("scores.txt");
if (myfilex.is_open()){
for(int i = 99;i>89;i--){
myfilex << HighscoreListe[i].spielerName << ":" << HighscoreListe[i].score<<endl;
}
myfilex.close();
}
else cout << "Unable to open file" << endl;
}
void highscore::readHighscore(){
string line;
ifstream myfile("scores.txt");
if (myfile.is_open()){
while(getline(myfile, line)){
cout << line << endl;
}
}
else cout << "Unable to open file" << endl;
}
Make a >> overload for highscore::Player.
In the >> overload
Use std::getline to read a line from the input stream.
Create a std::istringstream out of the line.
Use std::getline to read up to the : from the istringstream into a local string name;.
Use another std::getline to read the rest of the line into a string.
Convert the string into an int with std::stoi and store into a local int score;. Make sure you provide a pos argument.
Ensure that the entire string was converted by comparting the pos argument with the string's length.
If nothing went wrong, store name and score into the highscore::Player passed by the caller. Otherwise, set the failbit on the input stream with setstate
return the input stream.
Now the reading code should be something simple like
int scorecount = 0;
while (myfile >> HighscoreListe[scorecount])
{
scorecount++;
}
I am new to C++ (I usually use Java) and am trying to make a k-ary heap. I want to insert values from a file into the heap; however, I am at a loss with the code for the things I want to do.
I wanted to use .nextLine and .hasNextLine like I would in Java with a scanner, but I am not sure those are applicable to C++. Also, in the file the items are listed as such: "IN 890", "IN 9228", "EX", "IN 847", etc. The "IN" portion tells me to insert and the "EX" portion is for my extract_min. I don't know how to separate the string and integer in C++ so I can insert just the number though.
int main(){
BinaryMinHeap h;
string str ("IN");
string str ("EX");
int sum = 0;
int x;
ifstream inFile;
inFile.open("test.txt");
if (!inFile) {
cout << "Unable to open file";
exit(1); // terminate with error
}
while (inFile >> x) {
sum = sum + x;
if(str.find(nextLin) == true //if "IN" is in line)
{
h.insertKey(nextLin); //insert the number
}
else //if "EX" is in line perform extract min
}
inFile.close();
cout << "Sum = " << sum << endl;
}
The result should just add the number into the heap or extract the min.
Look at the various std::istream implementations - std::ifstream, std::istringstream, etc. You can call std::getline() in a loop to read a std::ifstream line by line, using std::istringstream to parse each line. For example:
int main() {
BinaryMinHeap h;
string line, item;
int x sum = 0;
ifstream inFile;
inFile.open("test.txt");
if (!inFile) {
cout << "Unable to open file";
return 1; // terminate with error
}
while (getline(inFile, line)) {
istringstream iss(line);
iss >> item;
if (item == "IN") {
iss >> x;
sum += x;
h.insertKey(x);
}
else if (item == "EX") {
// perform extract min
}
}
inFile.close();
cout << "Sum = " << sum << endl;
return 0;
}
I'm trying to get the function getFilename to prompt the user for which file to read and then pass that to the function readFile which calculates the numbers in the file and then (using displayAverage) display the average of the numbers in the file.
I'm new to coding and can't figure out why it doesn't seem to be using the readFile function... the program prompts the user for the file but after that it just inputs a blank line. Am I calling the functions & passing the parameters correctly?
void getFilename(char fileName[])
{
cout << "Please enter the filename: ";
cin >> fileName;
return;
}
float readFile(char fileName[])
{
cout.setf(ios::fixed);
cout.precision(0);
ifstream fin(fileName);
int sum = 0;
int numValue = 0;
float grades = 0;
float average= 0;
if (fin.fail())
{
cout << "Error opening file \"" << fileName << "\"";
return false;
}
while (!fin.eof())
{
fin >> grades;
sum += grades;
numValue++;
if (numValue != 10)
cout << "Error reading file \"" << fileName << "\"";
}
fin.close();
average = sum / 10;
return average;
}
void displayAverage(int average)
{
cout << average;
return;
}
int main()
{
char* fileName;
int average;
getFilename(fileName);
readFile(fileName);
displayAverage(average);
return 0;
}
Your program has undefined behaviour since fileName does not point to anything valid that can hold data.
Unless you are required to use an array of chars to hold the filename, use std::string for fileName.
std::string fileName;
If you are required to use an array of chars to hold the filename, use
char fileName[FILENAME_LENGTH];
Make sure FILENAME_LENGTH is large enough for your needs.
I want to make a factory class which creates and loads objects in from a file;
however when I try to read in a int from the file it appears to return a incorrect number.
std::ifstream input;
input.open("input.txt");
if (!input.is_open()){
exit(-1);
}
int number;
input >> number;
cout << number;
input.close();
When I enter a number in the input.txt file it shows: -858993460.
Changing the number doesn’t make a difference and when I use cin instead of ifstream it works like it should. I'm probably just missing something really stupid, but I can't figure it out.
Edit: Using getLine() works like it should. I guess there is a problem using >>.
Here is another solution to open a file a read it line by line:
string line;
ifstream myfile("input.txt");
if (myfile.is_open())
{
while ( getline (myfile,line) )
{
cout << line << '\n'; // Use this to verify that the number is outputed
// Here you can transform your line into an int:
// number = std::stoi(line);
}
// myfile.close(); Use this if you want to handle the errors
}
else cout << "Unable to open file";
If you don't want to read line by line, just remove the while
...
getline(myfile,line);
number = std::stoi(line);
...
Read multiple numbers in one line
Image that your input file is like this:
1, 2.3, 123, 11
1, 2
0.9, 90
Then, you can use this piece of code to read all the numbers:
string line;
ifstream myfile("input.txt");
string delimiter = ", ";
if (myfile.is_open())
{
while ( getline (myfile,line) )
{
cout << "Reading a new line: " << endl;
size_t pos = 0;
string token;
while ((pos = line.find(delimiter)) != string::npos) {
token = line.substr(0, pos);
cout << token << endl; // Instead of cout, you can transform it into an int
line.erase(0, pos + delimiter.length());
}
}
}
else cout << "Unable to open file";
The output will be:
Reading a new line:
1
2.3
123
11
Reading a new line:
1
2
Reading a new line:
0.9
90
New solution that may work =)
I didn't test this, but it works apparently:
std::ifstream input;
double val1, val2, val3;
input.open ("input.txt", std::ifstream::in);
if (input >> val1 >> val2 >> val3) {
cout << val1 << ", " << val2 << ", " << val3 << endl;
}
else
{
std::cerr << "Failed to read values from the file!\n";
throw std::runtime_error("Invalid input file");
}
To check the IO, see http://kayari.org/cxx/yunocheckio.html
I have the following structure:
struct productInfo
{
int item;
string details;
double cost;
};
I have a file that will input 10 different products that each contain an item, details, and cost. I have tried to input it using inFile.getline but it just doesn't work. Can anyone give me an example of how to do this? I would appreciate it.
Edit
The file contains 10 lines that look like this:
570314,SanDisk Sansa Clip 8 GB MP3 Player Black,55.99
Can you provide an example please.
Edit
Sorry guys, I am new to C++ and I don't really understand the suggestions. This is what I have tried.
void readFile(ifstream & inFile, productInfo products[])
{
inFile.ignore(LINE_LEN,'\n'); // The first line is not needed
for (int index = 0; index < 10; index++)
{
inFile.getline(products[index].item,SIZE,DELIMETER);
inFile.getline(products[index].details,SIZE,DELIMETER);
inFile.getline(products[index].cost,SIZE,DELIMETER);
}
}
This is another approach that uses fstream to read the file and getline() to read each line on the file. The parsing of the line itself was left out on purpose since other posts have already done that.
After each line is read and parsed into a productInfo, the application stores it on a vector, so all products could be accessed in memory.
#include <iostream>
#include <fstream>
#include <vector>
#include <iterator>
#include <string>
using namespace std;
struct productInfo
{
int item;
string details;
double cost;
};
int main()
{
vector<productInfo> product_list;
ifstream InFile("list.txt");
if (!InFile)
{
cerr << "Couldn´t open input file" << endl;
return -1;
}
string line;
while (getline(InFile, line))
{ // from here on, check the post: How to parse complex string with C++ ?
// https://stackoverflow.com/questions/2073054/how-to-parse-complex-string-with-c
// to know how to break the string using comma ',' as a token
cout << line << endl;
// productInfo new_product;
// new_product.item =
// new_product.details =
// new_product.cost =
// product_list.push_back(new_product);
}
// Loop the list printing each item
// for (int i = 0; i < product_list.size(); i++)
// cout << "Item #" << i << " number:" << product_list[i].item <<
// " details:" << product_list[i].details <<
// " cost:" << product_list[i].cost << endl;
}
EDIT: I decided to take a shot at parsing the line and wrote the code below. Some C++ folks might not like the strtok() method of handling things but there it is.
string line;
while (getline(InFile, line))
{
if (line.empty())
break;
//cout << "***** Parsing: " << line << " *****" << endl;
productInfo new_product;
// My favorite parsing method: strtok()
char *tmp = strtok(const_cast<char*>(line.c_str()), ",");
stringstream ss_item(tmp);
ss_item >> new_product.item;
//cout << "item: " << tmp << endl;
//cout << "item: " << new_product.item << endl;
tmp = strtok(NULL, ",");
new_product.details += tmp;
//cout << "details: " << tmp << endl;
//cout << "details: " << new_product.details << endl;
tmp = strtok(NULL, " ");
stringstream ss_cost(tmp);
ss_cost >> new_product.cost;
//cout << "cost: " << tmp << endl;
//cout << "cost: " << new_product.cost << endl;
product_list.push_back(new_product);
}
It depends on what's in the file? If it's text, you can use the redirect operator on a file input stream:
int i;
infile >> i;
If it's binary, you can just read it in to &your_struct.
You have to
0) Create a new instance of productInfo, pinfo;
1) read text (using getline) to the first comma (','), convert this string to an int, and put it into pinfo.item.
2) read text to the next comma and put it into pinfo.details;
3) read text to the endline, convert the string to a double, and put it into pinfo.cost.
Then just keep doing this until you reach the end of the file.
Here is how I would use getline. Note that I use it once to read from the input file, and then again to chop that line at ",".
ostream& operator>>(istream& is, productInfo& pi)
{
string line;
getline(is, line); // fetch one line of input
stringstream sline(line);
string item;
getline(sline, item, ',');
stringstream(item) >> pi.item; // convert string to int
getline(sline, item, ',');
pi.details = item; // string: no conversion necessary
getline(sline, item);
stringstream(item) >> pi.cost; // convert string to double
return is;
}
// usage:
// productInfo pi; ifstream inFile ("inputfile.txt"); inFile >> pi;
N.b.: This program is buggy if the input is
99999,"The Best Knife, Ever!",16.95