repeat until loop help

Fri, 26 Oct 2012 17:24:37 -0700

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...

Re: repeat until loop help

Tue, 30 Oct 2012 00:34:37 -0700

: 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...
:

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.

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

Readkey 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.

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repeat until loop help

Re: repeat until loop help