在C ++中无法在计算中获得正确答案

Question

This is my program for a lab. I have to apply two formulas and print answers for both. The first one is in this line:

cout<<"Hypoteneus is: " <<sqrt((x*x)+(y*y)) <<endl;

This one worked. The problem is in this one:

cout<<"Area is: " <<a*x <<((1/2)*x*y);

The problem is that it prints its answer as 0. I put the a*x for testing, that worked but the expression (1/2)*x*y is rendering 0 as answer. I input x as 1 and y as 2. Please help.

int main ()
{
    float x, y, a=122;
    cout<<"Enter x and y.\n";
    cin>>x >>y;
    cout<<"Hypoteneus is: " <<sqrt((x*x)+(y*y)) <<endl;
    fflush(stdin);
    cout<<"Area is: " <<a*x <<((1/2)*x*y);
    getch();
    return 0;
}

Answer 1

((1/2)*x*y) should be ((1.0/2.0)*x*y) or (0.5*x*y) .
Otherwise, the compiler will understand int/int and the result will be int so your expected 0.5 will become 0 .

Answer 2

1/2 specifies integer arithmetic, truncating the result to the nearest integer, which is zero.

Use 0.5f or 1.0f/2.0f for a float constant with the right value. Or divide by two instead of multiplying by a half.