C/math.h/isnormal

int isnormal(fpval): Returns nonzero if fpval is a normal value

<source lang="cpp">

1. include <stdio.h>
2. 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

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