Thread: No compiler/runtime error?

This is definitely a newbie question. I've got a very simple example where I expected to get a compile or runtime error, but it actually works, albeit with the wrong answer:

Code:

#include <stdio.h>
int square(int x) {
    return x*x;
}
int main() {
    float a = 12.5;
    int b = square(a);
    printf("%f^2 = %d\n", a, b);
    return 0;
}

If I compile it and run it, I get the following:

Code:

12.500000^2 = 144

It's the wrong answer and the wrong data type for the function call, but the C compiler allows it. Can someone point me to a reason?

Many thanks!