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

1. C / ANSI-C
2. math.h
3. isnan

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
*/         

           
       

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