Make Math.random return positive odd integer

Question

Fairly basic question but I need something that can make var n = Math.random() to give me "n" as a positive odd integer How do I do this?

var x = Math.random() * theRangeTop | 1; will give only odd integers — Tomasz Swider, Oct 09 '16 at 08:46

score 2 · Accepted Answer · edited May 23 '17 at 10:27

2

Generate an integer in the appropriate range, multiply it by 2, then add 1.

For example if you want odd integers between 1 and 99 then generate a random integer in the range 0 to 49.

Related

Generating random whole numbers in JavaScript in a specific range?

edited May 23 '17 at 10:27

Community

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answered Oct 27 '12 at 01:24

Mark Byers

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score 1 · Answer 2 · answered Oct 27 '12 at 01:32

Generate the number in desired range and then make it ODD if it is not.

    //<-Generate the number between 0 to MAX 
    int randNum=   (int)(Math.random()*MAX_VALUE); 
    if(randNum %2 == 0){//generated number is even
       if(randNum == MAX_VALUE){
         randNum  = randNum -1 ;
       }else{
         randNum  = randNum +1 ;
       }
    }

Now the random number is an odd number within the range

Make Math.random return positive odd integer

2 Answers2