CODEWITHSUNDEEP
c++while-loop
libra
libra

Reputation: 683

cannot quit while loop, (C++)?

here im trying a example from "C++ primer", however, it stuck at while loop. Here is my codes:

#include<iostream>
int main()
{
    int sum =0 , value =0 ;    
    while (std::cin >> value)
    {
        sum += value;
    }

    std::cout << "sum is: " << sum << std::endl;
    //system("pause");
    return 0;
}

Please tell me how is it wrong, i will really appreciate that Cheers Eason.li

Upvotes: 2

Views: 1095

Answers (4)

Josamoda
Josamoda

Reputation: 77

#include <iostream>
#include <string>

using namespace std;
int main()
{
    bool input=true;

    int sum =0 , value =0 ;    
    while (input)
    {
        string choice;
        std::cout << "Enter Value to be added to sum"<<std::endl;
        std::cin>>value;  
        sum += value;

        std::cout<<"add another value?"<<std::endl;
        std::cout<<"Enter yes or no"<<std::endl;
        std::cin>>choice;
        if(choice=="yes")
        input=true;

        if(choice=="no")
        break;

    }

    std::cout << "sum is: " << sum << std::endl;
    system("pause");
    return 0;
}

Upvotes: 0

Josamoda
Josamoda

Reputation: 77

You need to have a condition in the while loop 

while (value !=0)

Upvotes: 1

Sam I am says Reinstate Monica
Sam I am says Reinstate Monica

Reputation: 31204

just put a condition to exit in your while clause

std::cin >> value;
while (value != 0)
{
    sum += value;
    std::cin >> value;
}

or, alternatively

do
{
    sum += value;
    std::cin >> value;
}while(value != 0);

Upvotes: 1

Vlad from Moscow
Vlad from Moscow

Reputation: 311058

After entering a next value and pressing the Enter key you should press combination Ctrl+z (in Windows ) or Ctrl + d ( in Unix)

Upvotes: 9

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