C Reference Hexidecimal Digit Test: isxdigit()
The function isxdigit() returns a non-zero if its argument is a hexadecimal digit. (If the argument is a: a-f, A-F, or 0-9).
If the argument is not a hexadecimal digit, then zero is returned.
isxdigit() source code example:
#include<stdio.h>
#include<ctype.h>
int main()
{
char a;
scanf( "%c", &a );
if( isxdigit(a) )
printf( "Is a hexadecimal digit : %c\n", a );
else
printf( "This is NOT a hexadecimal digit: %c\n", a );
return 0;
}
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