#include cmpFsFd( float s, double d ) { float tmp = (float)d; return s == tmp ? 1 : 0; } int main(void) { double nv = 2.0 / 3; float foo = 2.0 / 3; if( foo == nv ) printf("True "); else printf("False "); if( cmpFsFd( foo, nv )) printf("True\n"); else printf("False\n"); return 0; }