C compiler bug (floating point arithmetic)?

Question

#include

int main()
{
    double fract=0;
    int tmp;

    //scanf(\"%lf\",&fract);
    fract=0.312;
    printf(\"%lf\",fract);
    printf(\"\\n         


        

Answer 1

Floating-point arithmetic is confusing, and not guaranteed to behave intuitively.

Here's a good reference document: What Every Computer Scientist Should Know About Floating-Point Arithmetic. It's a long document, because it's a complicated problem.

In summary: Don't use floating-point values if you are relying on exact values.