Randomizing Integers and eliminating last picked

[Joe Keller]

What is it you are trying to achieve?
So I was wondering how you randomized numbers, for example 1 to 6, and if one of them were chosen last time by the generater, don't let it be chosen again.


Post any relevant code (You may choose to attach the file instead of posting the code if it is too long)

Turing:

loop         randint (productrand, 1, 6)         counter := counter + 1 %Lots of code goes here but all i want is for the number that was picked last by randomizer to not be picked again. exit when counter = 3 end loop

[Beastinonyou]

Well, considering you already understand how to randomize integers, you just need a way to prevent that integer from being picked again.

A simple way to do this is using an array of boolean:

Turing:

var pickedAlready : array 1 .. 6 of boolean var randomInteger, counter : int := 0 % Set the array false, none of the numbers have been picked for i : 1 .. 6      pickedAlready (i) := false end for loop      randint (randomInteger, 1, 6)      % If that number hasn't been picked before      if pickedAlready (randomInteger) = false then           % Continue to do whatever you need.           counter += 1   % Counter to keep track of how many numbers have been used           pickedAlready (randomInteger) := true  % Finished with this number, we've used it      end if      exit when counter = 6  % Exits when all 6 numbers have been used end loop

[Joe Keller]

Thank you, I never used arrays before Ill put them in to my program in a bit and tell you how it went

[Tony]

it's important to recognize that with this method, picking the last element would just be a loop with 1/6 chance of exiting. This gets prohibitively slow when you are picking elements from a larger set.