Question

How to use isxdigit() function to check whether a character is hexdecimal digit character in C

Answer 1

#include <stdio.h>
#include <ctype.h>
 
int main(void) 
{
    int i = 0;
    char str[] = "FFAE01GH";
   
    while(str[i]) {
        if (isxdigit(str[i])) {
            putchar(str[i]);
        }
        i++;
    }
     
    return 0;
}
    
    
  
/*
run:
  
FFAE01
 
*/

 

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Answer 2

#include <limits.h>
#include <ctype.h>
#include <stdio.h>
 
int main(void)
{
    for (int i = 0; UCHAR_MAX >= i; i++) {
        if (isxdigit(i)) {
            printf("%c", i);
        }
    }
    
    return 0;
}


 
 
/*
run:
    
0123456789ABCDEFabcdef
    
*/

 

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