control random number with javascript

Question

This is my intent,

Generate random number
Store in variable
Clear variable
Generate new number greater than previous
Store in variable

I understand

(Math.floor(Math.random()*100)+1)

For 1-100 but not sure how to accomplish what I want exactly.

Why do you always need a greater number? What if you first pick is 99? — Halcyon
– Halcyon, Commented Jul 26, 2013 at 16:21
You need to provide some more details of what you want to achieve. last+=new will always be > last — Alex K.
– Alex K., Commented Jul 26, 2013 at 16:25

Naftali · Accepted Answer · 2013-07-26 16:25:58Z

1

The following will generate a random number and then find the next random number it finds that is greater than it (or equal to it if it is greater than or equal to 99):

var num = Math.floor(Math.random()*100)+1;
alert(num); //current number
var newNum;
while((newNum = Math.floor(Math.random()*100)+1) < num && newNum < 100);
alert(newNum); //new number > num (or == num if num >= 99)

answered Jul 26, 2013 at 16:25

Naftali

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collapsar · Accepted Answer · 2013-07-26 16:25:33Z

1

use

var ran_val = 1;
// ... some code goes here
ran_val = (Math.floor(Math.random()*100) + ran_val)

if you have no upper limit on the random numbers,

ran_val = (Math.floor(Math.random()*(100-ran_val)) + ran_val)

otherwise. fwiw, the random numbers you emulate this way are no longer uniformly distributed.

answered Jul 26, 2013 at 16:25

collapsar

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adeneo · Accepted Answer · 2013-07-26 16:29:03Z

1

var numb1 = Math.floor(Math.random()*100)+1, //Generate random number
    numb2 = 0;

while (numb2<numb1) {
    numb2 = Math.floor(Math.random()*100)+2; // Generate new number greater than previous
}

FIDDLE

answered Jul 26, 2013 at 16:29

adeneo

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Comments

putvande · Accepted Answer · 2013-07-26 16:25:46Z

0

You need to have a global variable and a function that handles the random number generation.

You can do something like this:

var num = 1;

function generaterandom(){
    num = Math.floor(Math.random()*100)+num;
}

answered Jul 26, 2013 at 16:25

putvande

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