THE AND OR NOT STATEMENTS
The AND, OR and NOT keywords are used where you want to execute a block of code (or statement) when more than one condition is necessary.

  AND   The statement is executed only if BOTH conditions are true,

	  if  (A = 1) AND (B = 2) then writeln('Bingo!');


  OR    The statement is executed if EITHER argument is true,

	  if (A = 1) OR (B = 2) then writeln('Hurray!');


  NOT   Converts TRUE to FALSE and vsvs

	  if NOT ((A = 1) AND (B = 2)) then writeln('Wow, really heavy man!');

	program  AND_OR_NOT_DEMO (output);
	var      a, b, c : integer;
	begin
	         a := 5;  b := 3;  c := 99;
	         if (a = 5) or (b > 2)  then writeln('A');
	         if (a < 5) and (b > 2) then writeln('B');
	         if (a = 5) and (b = 2) then writeln('C');
	         if (c <> 6) or (b > 10) then writeln('D') else writeln('E');
	         if (b = 3) and (c = 99) then writeln('F');
	         if (a = 1) or (b = 2)   then writeln('G');
	         if not( (a < 5) and (b > 2)) then writeln('H')
	end.