nan : nan « math.h « C Tutorial






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Header filemath.h
Declaratinfloat nanf(const char *content);
double nan(const char *content);
long double nanl(const char *content);
Returnreturns 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);
  }

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19.52.nan
19.52.1.nan