CODEWITHSUNDEEP
javarandomdecimal
Omid7
Omid7

Reputation: 3194

Generating decimal random numbers in Java in a specific range?

How can I generate a random whole decimal number between two specified variables in java, e.g. x = -1 and y = 1 would output any of -1.0, -0.9, -0.8, -0.7,….., 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.9, 1.0?

Note: it should include 1 and -1 ([-1,1]) . And give one decimal number after point.

Upvotes: 3

Views: 22979

Answers (2)

WannabeCoder
WannabeCoder

Reputation: 498

If you just want between -1 and 1, inclusive, in .1 increments, then:

Random rand = new Random();
float result = (rand.nextInt(21) - 10) / 10.0;

Upvotes: 2

Marv
Marv

Reputation: 3557

Random r = new Random();
double random = (r.nextInt(21)-10) / 10.0;

Will give you a random number between [-1, 1] with stepsize 0.1.

And the universal method:

double myRandom(double min, double max) {
    Random r = new Random();
    return (r.nextInt((int)((max-min)*10+1))+min*10) / 10.0;
}

will return doubles with step size 0.1 between [min, max].

Upvotes: 8

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