Vérifiez si le caractère saisi est une lettre, un chiffre ou un caractère spécial en C

#include <stdio.h>
#include <conio.h>
main() {
   char ch;
   printf("Enter a character: ");
   scanf("%c", &ch);
   if((ch >= &#39;A&#39; && ch <= &#39;Z&#39;) || (ch >= &#39;a&#39; && ch <= &#39;z&#39;))
      printf("This is an alphabet");
   else if(ch >= &#39;0&#39; && ch <= &#39;9&#39;)
      printf("This is a number");
   else
      printf("This is a special character");
}

Enter a character: F
This is an alphabet

Enter a character: r
This is an alphabet

Enter a character: 7
This is a number

Enter a character: #
This is a special character