[RESOLVED] Math.random()

[merhaba]

Hi,
I want my program to generate random numbers between -20 and +20 so how should I modify the following line ?
var randNum=Math.floor(Math.random()*???)
thanks for your help

[Harsh Gupta]

I think all languages actually generate random numbers from 0 to the specified number (or one less than that, whatever). So you can generate a number out of 40, then subtract 20 from it.

var num = Math.floor(Math.random()*40)-20;

[CornedBee]

Which generates the closed interval [-20;19], i.e. including those two. If you want to include 20, too, you're generating 41 numbers and must adjust.