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math.random question

Posted on 2014-07-22
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Last Modified: 2014-07-24
I have a fairly simple question:

Please explain the following based on this:

Math.floor(Math.random()*5+1);  -- I understand this gives me a random number from 0 up to and including 5.

why is math.floor needed?
why is 5+1 needed instead of just 6?
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Question by:Montoya
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3 Comments
 
LVL 58

Expert Comment

by:Gary
ID: 40211824
To make sure its a whole number and not something like 2.56584
.floor rounds down to the nearest whole number
.ceil rounds up to the nearest whole number
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Author Comment

by:Montoya
ID: 40213963
why is 5+1 needed instead of just 6?
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Accepted Solution

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Gary earned 300 total points
ID: 40214375
It's not 5+1 its
Math.random()*5 and then add 1

And it will be a random number between 1 and 5 not between 0 and 5
If you do want it between 0 and 5 then remove the +1
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