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

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C / ANSI-C » math.h » isnan

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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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