isxdigit() - Character Function

How is "isxdigit()" used in C++?

Explanation

isxdigit() is used to check if the argument is a hexadecimal characters in the range A-F,a-f,or 0-9. Those are "0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F". If the argument does not have a them, the function returns Zero.

Syntax:


int isxdigit ( int c );

Example :



#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
char str[] = { 'B', 'a','0', '@' };
#define SIZE sizeof( str ) / sizeof( char )
int main( void )
{
int j;
for( j = 0; j < SIZE; j++ )
{
if( isxdigit( str[j] ) )
{
printf( "Char %c is a hexadecimal
digit\n",str[j] );
}
else
{
printf( "Char %c is not a hexadecimal
digit\n",str[j] );
}
}
return 0;
}

Result :

Char B is a hexadecimal digit
Char a is a hexadecimal digit
Char 0 is a hexadecimal digit
Char @ is not a hexadecimal digit

In the above example, this function is used to check for hexadecimal characters in an array "str". In the array, all the digits are checked and correspondingly they are displayed.

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