C Tutorial/ctype.h/isxdigit

isxdigit

Item Value Header file ctype.h Declaration int isxdigit(int ch); Return returns nonzero if ch is a hexadecimal digit; otherwise zero is returned.

A hexadecimal digit will be in one of these ranges: A-F, a-f, or 0-9.

<source lang="cpp">#include <ctype.h>

 #include <stdio.h>
 int main(void)
 {
   char ch;
   for(;;) {
     ch = getchar();
     if(ch == "."){
         break;
     }
     if(isxdigit(ch))(){
         printf("%c is hexadecimal digit\n", ch);
     }
   }
   return 0;
 }</source>