I'm a student in a basic programming class and I'm trying to complete this program for a class assignment. It's a simple program that calculates compounded interest by the inputs of the user. However, when writing the code, I noticed that the the result is 0 even though based on the input I would expect otherwise. Could anyone tell me why the program isn't showing results?
#include <iostream>
#include <cmath>
using namespace std;
// Declarations of Prototype
void futureValue(double* presentValue, float* interestRate, int* months, double* value);
// List of variables
double presentValue = 0;
float interestRate = 0;
double value = 0;
int months = 0;
// Start of Main function
int main(void)
{
cout << "What is the current value of the account?";
cin >> presentValue;
cout << "How many months will Interest be added to the account?";
cin >> months;
cout << "And what will be the Interest Rate of the account?";
cin >> interestRate;
cout << "After " << months << " months, your account balence will be $" << value << ".";
return 0;
}
void futureValue()
{
if (presentValue <= 0)
{
cout << "I'm sorry, you must have a current balence of more than 0.00 dollars to calculate.";
return;
}
else
{
value = presentValue * pow(interestRate + 1, months);
return;
}
}
Yes. You are not calling the futureValue function which would compute the value for you. Due to the value not being computed, it remains 0. Fix:
#include <iostream>
#include <cmath>
using namespace std;
// Declarations of Prototype
void futureValue(double* presentValue, float* interestRate, int* months, double* value);
// List of variables
double presentValue = 0;
float interestRate = 0;
double value = 0;
int months = 0;
// Start of Main function
int main(void)
{
cout << "What is the current value of the account?";
cin >> presentValue;
cout << "How many months will Interest be added to the account?";
cin >> months;
cout << "And what will be the Interest Rate of the account?";
cin >> interestRate;
futureValue(); //Here we compute the value
cout << "After " << months << " months, your account balence will be $" << value << ".";
return 0;
}
void futureValue()
{
if (presentValue <= 0)
{
cout << "I'm sorry, you must have a current balence of more than 0.00 dollars to calculate.";
return;
}
else
{
value = presentValue * pow(interestRate + 1, months);
return;
}
}
Related
my code runs without errors or anything but after I put in an "F" or "P" it skips to "click any button to continue" but if I use any numbers it goes through the code fine.
Here is my code:
#include <iostream>
#include <iomanip> // needed to use set precision
using namespace std;
void calcCost(double f_benefits, double F, double total_cost, double emp_salary)
{
if (f_benefits == F)
(total_cost += emp_salary * 1.5);
else
(total_cost += emp_salary * 1.25); // calculating operating function
}
int main()
{
double num_emp = 0; // employees
double emp_salary = 0; // employees salary
double f_benefits = 0; // are they full time or part time benifits
double total_cost = 0;
int F = 0;
int P = 0;
cout << setw(69) << "Cost of Operation\n\n";
cout << "Please enter the number of employees to process: ";
cin >> num_emp;
cout << endl;
for (int i = 1; i <= num_emp; i++) // loop for each employees salary and benifits
{
cout << "Please enter the salary for employee " << i << ":";
cin >> emp_salary;
cout << "Is employee " << i << " receiving(F)ull or (P)artial benefits ? Please enter F or P : "; // Dont forget input validation for this step
cin >> f_benefits;
}
return 0;
}
Shouldn't f_benefits be a string?
The "cin >> f_benefits" is trying to read a double value. You should read the response into a char or string. Reading into a string expects a newline before returning.
You should also check that you got an "F" or "P" .
#include "stdafx.h"
#include <iostream>
#include <iomanip>
using namespace std;
int numofEmployees();
int daysMissed(int);
int AverageMissed(int, int);
int main()
{
cout << "Welcome to employee absentee calculator!" << endl;
int numEmployees = numofEmployees();
int Missed = daysMissed(numEmployees);
double misAverage = AverageMissed(numEmployees, Missed);
cout << "There are " << numEmployees << " in the company. They have missed " << Missed << " days total. On average, they have missed " << misAverage << " days." << endl;
return 0;
}
int numofEmployees() {
cout << "How many employees are in your company? ";
int employees;
cin >> employees;
while (employees < 1) {
cout << "Employee count must 1 or greater!" << endl;
}
return employees;
}
int daysMissed(int numEmployees) {
int Absence, totAbsence = 0;
for (int i = numEmployees; i < numEmployees; i++) {
cout << "How many days has each employee missed this passed year? ";
cin >> Absence;
totAbsence += Absence;
}
while (Absence < 0) {
cout << "Values entered must be positive numbers!" << endl;
cin >> Absence;
}
return totAbsence;
}
int AverageMissed(int numEmployees, int Missed){
double Average;
Average = double(numEmployees) / double(Missed);
return Average;
}
This code is being used to calculate the average number of employee absences by way of using three functions. The second function is not working correctly as it is not being called properly by the main. This is for a school assignment.
The problem is daysMissed - if numEmployees is <= 0, then Absense will be uninitialized. But, you say, "I check that in numofEmployees" - the problem is that the compiler doesn't do that sort of whole-program analysis before issuing these warnings.
There is another problem: daysMissed is wrong (twice). If there are two employees, and I enter -2 and 1, there will be no error for the negative number. If on the other hand, if I enter 1 and -2, you never correct totAbsence. You would be much better off writing a little function which reads a number >= some limit in a loop, and keeps prompting until given the correct value. Something like:
int read(const char* prompt, const char* err_prompt, int limit) {
cout << prompt << endl;
for(;;) {
int result;
cin >> result;
if (result >= limit) {
return result;
}
cout << err_prompt << endl;
}
}
Then daysMissed becomes much pleasanter to write - and you can use the same function to read the number of employees (which will go into an infinite loop at the moment)
You should also validate a division by zero plus change the return type.
double AverageMissed(int numEmployees, int Missed){
if (Missed > 0) return double(numEmployees) / Missed;
return 0;
}
by the way, there is no need to cast both operands in the division (/). Casting one of them will be enough to return a double type.
Hello I've ran into some trouble creating a GroceryItem class and using functions to accept and set input from a user.
Currently when I run the dataEntry function, the compiler moves on to the next function before accepting input from the first function.
I've created a test milk object to test my code but It doesn't allow me to enter data before moving to the next input prompt.
Once I can figure out the class functions, I will also create an array of objects and input values for such.
Any advice for how I can go about fixing this class and functions would be greatly appreciated!
#include <iostream>
using namespace std;
class GroceryItem{
private: int stockNumber;
double price = 0.0;
int quantity;
double totalValue;
double setPrice();
int setStockNum();
int setQuantity();
void setTotalValue();
public:
void dataEntry();
void displayValues();
};
int GroceryItem::setStockNum(){
int stock = 0;
cout << "Enter the stock number for the grocery item: ";
do {
cout << "Stock Number(1000-9999): ";
cin >> stock;
} while (!(stock >= 1000 && stock <= 9999));
stockNumber = stock;
return stockNumber;
}
double GroceryItem::setPrice(){
double x = 0.0;
cout << "Enter the price of the item: ";
while (!(x > 0)) {
cout << "Please enter a positive number for price!";
cin >> x;
}
price = x;
return price;
}
int GroceryItem::setQuantity(){
int x = 0;
cout << "Enter the quantity in stock: ";
while (!(x > 0)){
cout << "Please enter a positive number for quantity!";
cin >> x;
}
quantity = x;
return quantity;
}
void GroceryItem::setTotalValue(){
totalValue = (quantity * price);
}
void GroceryItem::dataEntry(){
setStockNum();
system("pause");
setPrice();
system("pause");
setQuantity();
system("pause");
setTotalValue();
}
void GroceryItem::displayValues(){
cout << "Stock number: " << stockNumber;
cout << "\nItem price: " << price;
cout << "\nQuantity on hand: " << quantity;
cout << "\nTotal value of item: " << totalValue;
}
int main(){
GroceryItem Milk;
Milk.dataEntry();
Milk.displayValues();
system("pause");
return 0;
}
Dude, pay attention to the condition of the while statement, the line
!(stock >= 1000 || stock <= 9999)
returns true for stock = 0 (always true, in this case), so the program won't enter the loop.
Maybe you meant something like:
!(stock >= 1000 && stock <= 9999)
AND(&&) not OR(||)
I've been trying to write a C++ program that calculates your end of year grade (an exercise given by the Google for Education C++ course). The program works, except for the fact that it doesn't calculate your final grade, instead, it just outputs "0". I have searched the code and can't seem to find the problem.
#include <iostream>
using namespace std;
int check(int a) {
if (!(cin >> a)) {
cout << "Come on, that isn't a score" << endl;
return 0;
}
}
int assignments() {
int assignment1 = 0;
int assignment2 = 0;
int assignment3 = 0;
int assignment4 = 0;
cout << "Enter the score for the first assignment. ";
check(assignment1);
cout << "Enter the score for the second assignment. ";
check(assignment2);
cout << "Enter the score for the third assignment. ";
check(assignment3);
cout << "Enter the score for the fourth assignment. ";
check(assignment4);
return ((assignment1 + assignment2 + assignment3 + assignment4) / 4 * 0.4);
}
int mid() {
int midterm = 0;
cout << "Enter the score for the midterm. ";
check(midterm);
return (midterm * 0.15);
}
int finalex() {
int finals = 0;
cout << "Enter the score for the final. ";
check(finals);
return (finals * 0.35);
}
int participation() {
int parti = 0;
cout << "Enter the class participation grade. ";
check(parti);
return (parti * 0.1);
}
int main() {
int assign = assignments();
int midt = mid();
int fingra = finalex();
int partigra = participation();
cout << "The final grade is: " << assign + midt + fingra + partigra << endl;
}
(The reason I have a different program for every grade type is because the course states that you should make as many functions as possible)
Either you should pass value to check() as reference or make check to return input value.
Change
int check(int a)
to
int check(int& a)
Second method
Modify check to
int check(int a) {
if (!(cin >> a)) {
cout << "Come on, that isn't a score" << endl;
return a;
}
}
And use return value to assign input to variables. Like
int midterm = 0;
cout << "Enter the score for the midterm. ";
midterm=check(midterm);
Your cin >> a statements updates value of a local variable which is gone as soon as check() returns. You want to update value of variables that are actually used for calculating grades. Just change the function check() to pass by reference check(int &a) or pass a pointer check(int *a)
Ok i've been programming for about a week now, i started with c++. I'm writing a program that is a kind of an arithmetic trainer, you enter the amount of equations you want, you enter your limit for the random number generator, you specify what kind of equations you want(/*-+), then the program uses a for loop and goes through and generates the equations and their answers in a var and then the users input is checked against this var and if they match another var which is counting the right answers is incremented. After the last equation the program tells the user how many they got right out of how many equations, and by dividing the amount of right answers by the amount of questions then multiplying this value by 100 u should obtain the accuracy percentage for this users arithmetic session. Problem is c++ keeps returning to me a friggin 0 value and i cannot for the life of me work out why in the world c++ is doing this.
entire program:
#include <iostream>
#include <string>
#include <ctime>
#include <cstdlib>
using namespace std;
void menu(void);
class session{
public:
session(){
create_session();
}
void create_session(void){
amount = 0;
range_limit = 0;
rights = 0;
answer = 0;
input = 0;
type = "";
while(amount == 0){
cout << "\nHow many equations do you want?: "; cin >> amount;
if(amount < 1){
cout << "\nAmount is too low!";
amount = 0;
}
}
while(range_limit == 0){
cout << "Enter the number range limit: "; cin >> range_limit;
if(range_limit < 1){
cout << "\nRange limit too low!";
range_limit = 0;
}
}
while(type == ""){
cout << "What equation type do you want?: "; cin >> type;
int strlen = type.size();
if(strlen < 1){
cout << "Invalid type input!";
type = "";
}
}
if(type == "+"){
for(int i=0;i<amount;i++){
int a = random();
int b = random();
answer = a + b;
cout << "\n" << a << " + " << b << " = "; cin >> input;
if(answer == input){
rights++;
}
}
}
cout << "\nYou got " << rights << " answers right out of " << amount << " equations." << endl;
cout << "Accuracy percentage: " << getAccuracy() << "%" << endl;
int post_menu=0;
while(post_menu == 0){
cout << "Enter 1 to create another session or 2 to return to the menu: ";
cin >> post_menu;
if(post_menu == 1){
create_session();
}else if(post_menu == 2){
menu();
}else{
cout << "Invalid input: ";
post_menu = 0;
}
}
}
float getAccuracy(){
float x = (rights/amount)*100;
return x;
}
int random(){
int x = 1+(rand()%range_limit);
return x;
}
void set_amount(int a){
amount = a;
}
void set_range_limit(int r){
range_limit = r;
}
void set_rights(int R){
rights = R;
}
void set_answer(int a){
answer = a;
}
void set_input(int i){
input = i;
}
void set_type(string t){
type = t;
}
private:
int amount;
int accuracy;
int range_limit;
int rights;
int answer;
int input;
string type;
};
int main(){
cout << "=== WELCOME TO ARITH! === \n=========================\n";
menu();
return 0;
}
void menu(void){
//Set the seed for random number gen.
srand(time(0));
//Set var for getting menu input, then get the menu input..
int menu_input;
cout << "\n[1]Create a Session. [2]Exit Arith. \nWhat would you like to do?: ";
cin >> menu_input;
//Now we check what the user wants and act accordingly..
if(menu_input > 2){
cout << "error";
menu_input=0;
}else if(menu_input == 1){
session start;
}else if(menu_input == 2){
cout << "\nExiting Arith!";
}else{
cout << "error";
menu_input=0;
}
}
Troublesome part:
float getAccuracy(){
float x = (rights/amount)*100;
return x;
some how the program is returning 0%.
anyone know why this is so and how to get the result im after.
rights and amount both are int , so when you divide the value is floored, for example if you do 5/2 the answer would be 2 instead of 2.5. To solve this you need to cast one of the variable to float like this: (float(rights)/amount) * 100.
when two int numbers are divided the result will also be int even if temporary variable. so you can make any of the variable float or double or cast it.
You need to convert only one data type because the other will be type promoted implicitly.
float x = ((double)rights/amount)*100;
or you can make your amount variable float by default if it doesnt affect any other part of your code.
Also you have the option to static cast:
float x = (static_cast<double>(rights)/amount)*100;