CODEWITHSUNDEEP
randomgenerator
user2966448
user2966448

Reputation: 39

How do i generate a random number but make sure its between a range of two numbers (JAVA)

I need to generate a random number between 8 and 32. then multiply to the power of 2. then repeat it in a loop 10 times. I can't figure how to generate the number within a range this is what i have so far. 

 function btnGenerate_onclick()
{
// assign textbox elements to variables for easier access
var outputTextbox = document.getElementById("txtOutput");


for(var i = 0; i < 10; i++) 
{
System.out.println(Math.pow(2, Math.floor(Math.random() * 32 + 1); ));
}


outputTextbox.value = ;

}

Upvotes: 0

Views: 433

Answers (3)

Nathaniel Johnson
Nathaniel Johnson

Reputation: 4839

In plain english:

Math.random returns a number between 0 and 1.

http://www.w3schools.com/jsref/jsref_random.asp

Multiply that by the range between the numbers number2-number1 to get a number that is between 0 and greatest range-1. We can call it range.

Add the lower bound number number1 to get a number that is between number1 and number2

Here is the program in plunker http://plnkr.co/edit/gXSxTl03BFTFDMVFd0YC?p=preview

var random = Math.random();

var number1 = 5.0;
var number2 = 12;

var range = number2-number1;
var rangedRandom = range*random;

var rangedRandomPlusLeast = number1+rangedRandom;

var rangedRandomPlusLeastAsInteger = Math.round(rangedRandomPlusLeast);

Upvotes: 1

Red Alert
Red Alert

Reputation: 3816

Math.random() gives a number between 0.0 and 1.0. If you multiply it by 32, you get a number between 0.0 and 32.0. If you want something between 8 and 32, you should do Math.random() * 24 + 8. That will give you something between 8.0 and 32.0.

Upvotes: 1

Vallabh Patade
Vallabh Patade

Reputation: 5110

Following code generates random number between 50 and 100 (Both inclusive). 

final int MAX = 100;
final int MIN = 50;
.
.
.
Random r = new Random();
// nextInt is normally exclusive of the MAX value,
// so add 1 to make it inclusive
int randomNumber = r.nextInt((MAX-MIN) + 1) + MIN;

Upvotes: 2

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