Computer Science Canada

Negatives
Author:  AK.E [ Fri Jan 19, 2007 2:10 pm ]
Post subject:  Negatives
I have a program in which I want to get a number but prevent them from entering negatives. I know I can simply use if number < 0 then... but that only works for the first time. Let's say someone enters -5.. it won't except it.. but when they enter 100 then -5 it will because the number will be 95 which is above 0.

Here's my code:
Turing:

var numberOfBars : string
var numberOfBarsInt : int
var barX : int := 0

get numberOfBars                                 


        if strintok (numberOfBars) then       

            numberOfBarsInt := strint (numberOfBars) + barX     

            put numberOfBarsInt                             


        else

            put " "

            put "Please insert a valid integer." 
Author:  Clayton [ Fri Jan 19, 2007 4:02 pm ]
Post subject:  Re: Negatives
use natural numbers instead of integers

Turing:

var my_nat : nat := 5
Author:  Cervantes [ Fri Jan 19, 2007 5:03 pm ]
Post subject:  Re: Negatives
There are strnat and strnatok functions, yes? Using those would solve your problem.

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