What happens to unused function return values?

Question

If I have a program:

#include 

using namespace std;

int TestIntReturn(int &x, int &y)
{
    x = 1000;
    y = 1000;
    return x+y;         


        

Answer 1

The return value is stored on the stack and popped off when the function returns. Since it is not being assigned to a variable by the caller, it is just discarded when the stack is popped.