how come the following code doesn't print out that i want.

[Yangfizz]

#include <iostream>

using namespace std;

int function(int x, int y);


int main()
{
    int x, y;
    function(x,y);
    return 0;
}

int function(int x, int y)
{
    cin>>x;
    cin>>y;
    return (x+y);
}

after i input two values and the program ends, it doesn't return me the sum of the 2 values.

[whitenite1]

@Yangfizz

For one, x and y have no values. Your not passing anything to function(int, int y). Below is probably not the best way of doing it, but this works.

int main()
{
    int x, y, sum;
   cin>>x;
    cin>>y;
    sum = function(x,y);
    cout << sum << "\n"; 
}

int function(int x, int y)
{
 
    return (x+y);
}

[Yangfizz]

i know what you saying, so the any value after return will not be printed out on the screen?

[Chervil]

Well, your original code didn't do anything with the value returned from the function.

Your code:

    function(x,y);
    return 0;

needed at least something like this:

    cout << function(x,y);
    return 0;

Or you could have:

    int sum = function(x,y);
    cout << "Sum = " << sum;
    return 0;

Basically, the reason nothing was printed was because there was no cout in the code shared in the opening post above.