isxdigit() - ctype.h

The C library function int isxdigit(int c) checks whether the passed character is a hexadecimal digit.
This function returns a non-zero value(true) if c is a hexadecimal digit else, zero (false).

Syntax

int isxdigit(int c);

Example

#include <stdio.h>
#include <ctype.h>

int main()
{
   char var1[] = "tuts";
   char var2[] = "0xE";
  
   if( isxdigit(var1[0]) )
   {
      printf("var1 = |%s| is hexadecimal character\n", var1 );
   }
   else
   {
      printf("var1 = |%s| is not hexadecimal character\n", var1 );
   }
   
   if( isxdigit(var2[0] ))
   {
      printf("var2 = |%s| is hexadecimal character\n", var2 );
   }
   else
   {
      printf("var2 = |%s| is not hexadecimal character\n", var2 );
   }
   
   return(0);
}

Output / Return Value

var1 = |tuts| is not hexadecimal character
var2 = |0xE| is hexadecimal character

Limitations

Alternatives / See Also

Reference