(* test strings *)

main(): void {

 {  

  x1 = 'abBC';  (* correct - must be case sensitive *) 

  x2 = '';  (* error: empty string, line 10 *) 

  x3 = 'a';  (* correct *) 

  x4 = "a";  (* error: unrecognized character, line 14 *) 

  x5 = 'a\'ad';  (* correct - lexema: aad *) 

  x6 = '\'';  (* correct - lexema: / *) 

  x7 = 'b'd';  (* error: line 20 *) 

  x8 = 'abcd';  (* correct *) 

  x9 = 'a\'b\'cd';  (* correct lexema a'b'cd *) 

  x10 = 'a\\d';  (* correct lexema a\d *) 

  x11 = 'a\'\\d';  (* correct lexema a'\d *) 

  x12 = 'a\'\d';  (* error line 30  *) 

  x13 = 'xxxxxxx';  (* correct  *) 

  x14 = 'aa\\\aa';  (* error line 34 *) 

  x15 = 'aa\\\'aa';  (* correct lexema a\'a *) 

  x16 = 'a\\\\a';  (* correct lexema a\\a *) 

  x17 = 'aabbbbbbbb; (* error, line 40 *) 
 }

}