CODEWITHSUNDEEP
c#unity-game-engine2d
Jonas Brocklehurst
Jonas Brocklehurst

Reputation: 3

Random.Range picking two numbers, if the same, pick one new

I am picking and laying sprites on top of eachother, and I am doing this by picking them at random from an array. To give the illusion of them not reapeating, it is critical that they are not the same.

How do I achieve this, withouth adding to my array, and therefor putting my index out of the array bounds?`

  //Random Sprite Value
    int bloodSprite  = Random.Range(0, 12);
    int bloodSprite2 = Random.Range(0, 12);

    if (bloodSprite == bloodSprite2)
    {
        // what do I write here? (if here)
    }

Upvotes: 0

Views: 483

Answers (3)

b23v
b23v

Reputation: 86

First get a random from 0 to 12 say x, then get a random from 0 to x - 1 or from x + 1 to 12. U can chose any.

int s1 = Random.Range(0, 12);
int s2 = s1 == 0 ? Random.Range(s1, 12) : Random.Range(0, s1);

You don't really need a loop for this.

Upvotes: 1

Prasad Telkikar
Prasad Telkikar

Reputation: 16069

do.. while will be helpful over here

//Initialize default value to bloodSprite and bloodSprite2
int bloodSprite = int.MinValue;
int bloodSprite2 = int.MinValue;
do
{
    //Random Sprite Value
    bloodSprite  = Random.Range(0, 12);
    bloodSprite2 = Random.Range(0, 12);
    //At the end, check condition in while.
}while(bloodSprite == bloodSprite2);

int.MinValue : It is constant represents smallest possible value of an integer.

In above solution, We defined smallest possible value of int to bloodSprit, which will update it in side do..while() loop

Why we used do..while() loop?

  • do..while loop execute code first and check condition at the end of loop. This allows us to execute code inside do..while loop at least once.

Flow chart diagram:

enter image description here

Upvotes: 1

Vivek Nuna
Vivek Nuna

Reputation: 1

It should work for you.

while(bloodSprite == bloodSprite2)
{
   bloodSprite2 = Random.Range(0, 12);
}

Warning: there is a very very low probability of ending up in infinite while loop.

Upvotes: 0

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