#include <stdio.h>
#include <math.h>
// Return non-zero if x is a NaN and zero otherwise
int main(int argc, char **argv)
{
printf("isnan(1.0 / 0.0) = %d\n", isnan(1.0 / 0.0));
printf("isnan(-1.0 / 0.0) = %d\n", isnan(-1.0 / 0.0));
printf("isnan(0.0) = %d\n", isnan(0.0));
printf("isnan(NAN) = %d\n", isnan(NAN));
printf("isnan(INFINITY) = %d\n", isnan(INFINITY));
printf("isnan(0.0 / 0.0) = %d\n", isnan(0.0 / 0.0));
printf("isnan(INFINITY / -INFINITY) = %d\n", isnan(INFINITY / -INFINITY));
return 0;
}
/*
run:
isnan(1.0 / 0.0) = 0
isnan(-1.0 / 0.0) = 0
isnan(0.0) = 0
isnan(NAN) = -1
isnan(INFINITY) = 0
isnan(0.0 / 0.0) = -1
isnan(INFINITY / -INFINITY) = -1
*/
