int isnan(fpval): Returns nonzero if fpval is not a number. : isnan « math.h « C Tutorial

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C Tutorial » math.h » isnan

19.37.1.int isnan(fpval): Returns nonzero if fpval is not a number.

#include <stdio.h>

#include <math.h>



int main(void)

{

  printf("isnan(-1.0) %d\n", isnan(-1.0));

  printf("isnan(1.0) %d\n", isnan(1.0));

  printf("isnan(0.0) %d\n", isnan(0.0));

  return 0;

}

isnan(-1.0) 0
isnan(1.0) 0
isnan(0.0) 0

19.37.isnan
	19.37.1.	int isnan(fpval): Returns nonzero if fpval is not a number.

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