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repeat until loop help

abdlwahdsa1abdlwahdsa1 Posts: 2Member
Im a beginner and i got a problem with repeat until loop
I want to know what exactly is supposed to happen in this little program :

program looptest;
Uses Crt;
Var YN : String;

Begin
Writeln('Y(YES) or N(NO)?');
Repeat {repeat the code for at least one time}
YN := Readkey ;
If YN = 'y' then Halt; {Halt - exit}
If YN = 'n' then Writeln('Why not? Exiting...');
Delay(1800); { wait a second plus 800 milliseconds }
Until (YN = 'y') OR (YN = 'n');
End.

thanks very much...

Comments

  • Actor21Actor21 Posts: 35Member
    : Im a beginner and i got a problem with repeat until loop
    : I want to know what exactly is supposed to happen in this little
    : program :
    :
    : program looptest;
    : Uses Crt;
    : Var YN : String;
    :
    : Begin
    : Writeln('Y(YES) or N(NO)?');
    : Repeat {repeat the code for at least one time}
    : YN := Readkey ;
    : If YN = 'y' then Halt; {Halt - exit}
    : If YN = 'n' then Writeln('Why not? Exiting...');
    : Delay(1800); { wait a second plus 800 milliseconds }
    : Until (YN = 'y') OR (YN = 'n');
    : End.
    :
    : thanks very much...
    :
    [code]
    program looptest;
    Uses Crt;
    Var YN : String;

    Begin
    Writeln('Y(YES) or N(NO)?');
    Repeat {repeat the code for at least one time}
    YN := Readkey ;
    If YN = 'y' then Halt; {Halt - exit}
    If YN = 'n' then Writeln('Why not? Exiting...');
    Delay(1800); { wait a second plus 800 milliseconds }
    Until (YN = 'y') OR (YN = 'n');
    End.
    [/code]
    [blue]
    The program goes through the loop repeatedly until you hit either a lower case 'y' or a lower case 'n'. If you hit 'y' the program ends immediately. If you hit 'n' the program prints 'Why not? Exiting...', exits the loop and terminates anyway. There is a 1.8 second delay each time through the loop.

    The [b]Halt[/b] exits the program immediately without going through the delay at the bottom of the loop. The other exit encounters the [b]Delay[/b].

    [b]Readkey[/b] will wait for you to hit a key and need not be followed by hitting the Enter key. If you do hit the Enter key it will be ignored.

    [/blue]

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