C library function - isxdigit()

Description

The C library function int isxdigit(int c) check whether the passed character is hexadecimal digit.

Declaration

Following is the declaration for isxdigit() function.

int isxdigit(int c);

Parameters

• c -- This is the character to be checked.

Return Value

This function returns a non zero value(true) if c is hexadecimal digit else, zero (false)

Example

The following example shows the usage of isxdigit() function.

#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);
}

Let us compile and run the above program, this will produce the following result:

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