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Returns nonzero if fpval is a normal value

#include <stdio.h> #include <math.h> int main(void) { printf("isnormal(-1.0) %d\n", isnormal(-1.0)); printf("isnormal(1.0) %d\n", isnormal(1.0)); printf("isnormal(0.0) %d\n", isnormal(0.0)); return 0; } /* isnormal(-1.0) 1 isnormal(1.0) 1 isnormal(0.0) 0 */