Computer Science Canada

Loop within a loop?

Author:

TipsyCzar [ Thu Sep 15, 2016 12:21 pm ]

Post subject:

Loop within a loop?

What is it you are trying to achieve?
<I'm trying to add a loop within a loop>

What is the problem you are having?
<Anything I try brings me to Syntax Error>

Describe what you have tried to solve this problem
<Tried adding names to the loops, like : loop 1, end loop 1>

Post any relevant code (You may choose to attach the file instead of posting the code if it is too long)
<The code would look something like this (the code isn't used for anything, only wrote it as an example) :>

Turing:

loop 1

put "Enter a number"

loop 2

get number

if number = varname then
put "You gessed correctly"
exit loop 2
elsif number not= varname then
end loop 1
end if

Please specify what version of Turing you are using
<Turing 4.1>

Author:

DemonWasp [ Thu Sep 15, 2016 2:06 pm ]

Post subject:

RE:Loop within a loop?

You need one end loop for every loop command, and one exit for every loop that you want to be able to exit. For example:

Turing:

loop
put "Enter a number"
loop
get number
if number = varname then
put "You guessed correctly"
exit % this will exit the inner loop, but not the outer one
else
put "You guessed incorrectly"
end if
end loop

% you should probably have a way to exit this loop too, or it will loop forever
end loop

Author:

TipsyCzar [ Fri Sep 16, 2016 7:38 am ]

Post subject:

Re: RE:Loop within a loop?

Here's the last part of a program I'm working on (note that the loops start are earlier on in the code)

Turing:

%Play again
put "Your balance is currently $" ..
put balance ..
put " . Do you want to play again with the same numbers? yes/no"
get answer
if answer = "yes" then
end loop
elsif answer = "no" then
exit
end if
%all possibilities have ended. Restart the loop
end loop

The first end loop go the error (Syntax Error at "loop". Expected "end if"). The elsif got the error ("elsif" without matching "if"). The end if got the error (Syntax Error at "if". Expected "end loop"). The rest of the code has no errors.[/i]

Author:

DemonWasp [ Fri Sep 16, 2016 12:44 pm ]

Post subject:

RE:Loop within a loop?

You need to match the start of a block structure to its end (like a loop ... end loop or an if ... end if structure). You cannot mix-and-match.

OK:

code:

loop
if
end if
end loop

Also OK:

code:

if
loop
end loop
end if

Wrong:

code:

loop
if
end loop
end if

See how they aren't matched? That's what's wrong.

In the future, please paste all the relevant parts of your code. It's harder to understand what your problem is if I can't see the whole thing.

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