text: // Program to categorize a single character that is entered at the terminal 
  
  #include <stdio.h> 
  
  int main (void) 
  {
      char  c;
      printf ("Enter a single character:\n");
      
      scanf ("%c", &c);
      
      if ( (c >= 'a'  &&  c <= 'z') || (c >= 'A'  &&  c <= 'Z') )
          printf ("It's an alphabetic character.\n");
      else if  ( c >= '0'  &&  c <= '9' )
          printf ("It's a digit.\n");
      else
          printf ("It's a special character.\n");
          
          return 0; 
          
  } 