why nan and infs evaluate to true when used as if condition values?

#include <stdio.h>
int main() {
    int a = 0;
    if (1.0/0.0)
         printf("result was true");
    else
        printf("result was false");
}

I get "result was true" in the compilers i tried - Is this the right
behaviour expected? shouldn't nans and infs treated as false?

thanks!
-ganesh
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