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Algorithms and Programming eXercises #7

Iteration using REPEAT...UNTIL - Solutions

1.	
   Procedure TForm1.biggestclick(sender : TObject);
	{accepts integers and outputs the biggest of them}
	Var	num,
			biggest	: integer;
	Begin
		biggest := 0;  {a 'rediculously' small number}
		repeat
			num := strtoint(inputbox('Input','Enter a number (0 to quit)','0');
			if num > biggest
				then biggest := num
		until num = 0;
		showmessage('The biggest number inputted was ' + inttostr(biggest))
	End;		

2.	Procedure TForm1.smallclick (Sender:TObject);
	{accepts integers and outputs the smallest of them}
        Var     num,
                smallest	: integer;
	Begin
		smallest := maxint; {an 'unusually' large number}
		repeat
			num := strtoint(inputbox('Input','Enter a number (0 to quit)','0');
			if (num < smallest) and (num <> 0)
				then smallest := num
		until num = 0;
		showmessage('The smallest number inputted was ',smallest)
	End;		

3.	Procedure TForm1.trapclick(sender:TObject);
	{traps the user in a loop until they respond y/n}
	Var	reply : char;
	    temp : string;
	Begin
		repeat
			temp := inputbox('Entry','Enter a Character','');
			reply := temp[1];
		until upcase(reply) in ['Y','N']
	End.

4.	Procedure TForm1.fibbonachiclick(Sender:TObject);
	{generates and outputs fibbonacci numbers up until 1000}
	Var	num1, num2, temp : integer;
	    temp2 : string;
	Begin
		num1 := 1;
		num2 := 1;
		temp2 := '1 1 ';
		repeat
			temp := num1 + num2;
			num1 := num2;
			num2 := temp;
			temp2 := temp2 + inttostr(num2) + ' ';
		until  num2 > 1000;
		showmessage(temp2)
	End;

5.	Procedure TForm1.Gobbldeygookclick (Sender:TObject);
	{Prints random letters and stops when a 'Z' is printed}
	Var	letter : char;
			ascii : byte;
	Begin
		repeat
			ascii := random(26)+ 65;
			letter := char(ascii);
			showmessage(letter)
		until letter = 'Z'
	End.

6. this is an exercise in changing values on forms when others change - see how you go, 
there are lots of solutions
 
  

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