while(cin >> ) input in keyboard does not stop

general
,
1

I have already asked this type of question here:
[READ IT FOR MORE DETAILED QUESTION]

and i was advised that when there is nothing to be read, the while loop will break.

But that doesnt work for me. When i open the program, type the input, and when im finished with the input I just keep pressing enter and the program doesnt stop. It keeps on accepting nothing.

the inputs are
A 3
B 5
B+ 3
C 3

the expected output is 3.10714

and here’s my code
#include
#include
using namespace std;

int main()
{
string letterGrade;
int units;
float pointValue = 0, prod1 = 0, sum = 0, product = 0;

while(cin >> letterGrade >> units)
{
    
    if(letterGrade[0] == 'A')
    {
        pointValue += 4;
    }
    else if(letterGrade[0] == 'B')
    {
        if(letterGrade[1] == '+')
        {
            pointValue += 3.5;
        }
        else
            pointValue += 3;
    }
    else if(letterGrade[0] == 'C')
    {
        if(letterGrade[1] == '+')
        {
            pointValue += 2.5;
        }
        else
            pointValue += 2;
    }

    else if(letterGrade[0] == 'D')
    {
        pointValue += 1;
    }

    product = pointValue * units;
    pointValue = 0;
    prod1 += product;
    sum += units;




}


cout << prod1/sum << endl;

return 0;

}

I am not allowed to use advance methods either. Any advice?

2

Ur code works fine!
link : http://ideone.com/3whSPD

3

When I run the program in Windows XP, the command prompt doesnt stop accepting input and it doesnt terminate either. I am quite puzzled that some are saying it works fine.

4

On online judges or on online compilers(because they use linux complier) your code will run fine but on windows it will not stop at EOF.Here is the link http://stackoverflow.com/questions/7095581/actual-difference-between-end-of-line-and-end-of-file-under-windows

1 Like