nan : nan « math.h « C Tutorial

19.52.1.nan

Item	Value
Header file	math.h
Declaratin	float nanf(const char content); double nan(const char content); long double nanl(const char *content);
Return	returns a value that is not a number and that contains the string pointed to by content.

#include <math.h>

  #include <stdio.h>



  int main(void)

  {

     double f;



     f = nan("2.0");

    

     printf("%f " , f);

  }

-1.#IND00

19.52.nan
	19.52.1.	nan

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