Computer Science Canada

proc only to except 4 answers otherwise loop
Author:  n00b.skillz [ Sat Jan 13, 2007 6:10 pm ]
Post subject:  proc only to except 4 answers otherwise loop
okay well i am doing a trivia game and i am wondering is there a piece of code i can stick into my procedure to make it only accept a,b,c or d instead of accepting any letter of the alphabet saying it's wrong and going on. Sort of like if the user puts "a" then it will accept and say right or wrong but if the user puts something other than a,b,c or d .... something like "k" then the program will not accept this and stay at the question until it is responded to with one of the options a,b,c or d
Author:  neufelni [ Sat Jan 13, 2007 6:42 pm ]
Post subject:  RE:proc only to except 4 answers otherwise loop
All you need is a simple if statement.
pseudo:
if letter = a, b, c, or d then
    put "Question is right" .. or "Question is wrong"
else
    put "Invalid input"
end if
Author:  n00b.skillz [ Sat Jan 13, 2007 7:18 pm ]
Post subject:  Re: proc only to except 4 answers otherwise loop
yea i realize u can do it that way but can u do it without a put statement... just so the program doesn't move or just stays there until a valid choice is picked
Author:  AK.E [ Sat Jan 13, 2007 7:31 pm ]
Post subject:  Re: proc only to except 4 answers otherwise loop
Why not try something like this

Turing:
var letter : array char of boolean

loop
    Input.KeyDown (letter)

    if letter ('a') or letter ('b') or letter ('c') or letter ('d') then
        put "Answer is right"
        exit
    end if
end loop


Obviously that can be expanded a lot but it gives you the general idea.

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