isxdigit() function in C Language

Last Updated : 07 Dec, 2017

isxdigit() function in C programming language checkes that whether the given character is hexadecimal or not. isxdigit() function is defined in ctype.h header file.

Hexadecimal equivalent of Decimal Numbers:

Hexadecimal: 0   1   2   3    4   5    6   7    8   9    A    B       C      D    E     F
Decimal:    0   1    2   3    4   5    6   7    8   9    10   11    12     13    14    15

Syntax:

char isxdigit( char x);

Examples:

Input : A
Output : Entered character is hexadecimal
Input : 2
Output : Entered character is hexadecimal
Input : @
Output : Entered character is not hexadecimal

// C program to demonstrate isxdigit() 
#include <ctype.h> 
#include <stdio.h> 
  
int main() 
{ 
    // taking input 
    char ch = 'A'; 
  
    // checking is the given input is hexadecimal or not? 
    if (isxdigit(ch)) 
        printf("\nEntered character is hexadecimal"); 
    else
        printf("\nEntered character is not hexadecimal"); 
} 

Output:

Entered character is hexadecimal

Application : isxdigit() function in C programming language is used to find out total numbers of hexadecimals present in any given input.
Example:

Input: abc123
Output: Number of hexadecimals present in the given input is : 6
Input: abcdef
Output: Number of hexadecimals present in the given input is : 6
Input: 123456@$
Output: Number of hexadecimals present in the given input is : 6

Let’s see C program on this topic:

// C program to demonstrate isxdigit() 
#include <ctype.h> 
#include <stdio.h> 
  
int ttl_hexadecimal(int i, int counter) 
{ 
    char ch; 
    char a[50] = "@#asf12345"; 
    ch = a[0]; 
  
    // counting of hexadecimal numbers 
    while (ch != '\0') { 
        ch = a[i]; 
        if (isxdigit(ch)) 
            counter++; 
  
        i++; 
    } 
  
    // returning total number of hexadecimal 
    // in the given input 
    return (counter); 
} 
  
int main() 
{ 
    int i = 0; 
    int counter = 0; 
    counter = ttl_hexadecimal(i, counter); 
  
    printf("\nNumber of hexadecimals in string"
             " is : %d", counter); 
    return 0; 
} 

Output:

Number of hexadecimals in string is : 7

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