PASCAL: AN INTRODUCTION

COMPARISON OF CHARACTER VARIABLES
Character variables, when compared against each other, is done using the ASCII value of the character. Consider the following portion of code,


	var  letter1, letter2 : char;
	begin
	     letter1 := 'A';  letter2 := 'C';
	     if letter1 < letter2   then
	        writeln( letter1, ' is less than ',letter2 )
	     else
	        writeln( letter2, ' is less than ',letter1 )
	end.

STRING ARRAYS, COMPARISON OF
Packed character arrays of the same length are comparable. There follows a short program illustrating this,


	program PACKED_CHAR_COMPARISON (output);
	type  string1 = packed array [1..6] of char;
	var   letter1, letter2 : string1;
	begin
	      letter1 := 'Hello ';
	      letter2 := 'HellO ';

	      if letter1 < letter2 then
	         writeln( letter1,' is less than ',letter2)
	      else
	         writeln( letter2,' is less than ',letter1)
	end.