Produces incorrect result. Where is the mistake?

Question

C++ / C#

Explain to the blind man why the program below displays either "C" or nothing, empty, emptiness, 0.
The task is this:

And here is the code itself:

int main()
{
    float x, y, r1, r2, t;

    printf("r1 = ");
    scanf("%d", &r1);
    printf("r2 = ");
    scanf("%d", &r2);
    printf("x = ");
    scanf("%d", &x);
    printf("y = ");
    scanf("%d", &y);

    t = (x * x)+ (y * y);
   
    if (t > r2*r2) printf("D");
    else if (t > r1*r1)
    {
        if (x > 0 && y > 0) printf("D");
        else printf("B");
    }
    else if (t < r1*r1)
    {
        if (x > 0 && y > 0) printf("C");
        else printf("A");
    }

    return 0;
}

As I understand it, depending on the given coordinates, you need to find the area under which these coordinates fall and display "A", "B', "C" or "D".

Answer 1

Go through the debugger. At least check that your input is correct.