Win a copy of TDD for a Shopping Website LiveProject this week in the Testing forum!
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
• Campbell Ritchie
• Paul Clapham
• Ron McLeod
• Jeanne Boyarsky
• Tim Cooke
Sheriffs:
• Liutauras Vilda
• paul wheaton
• Henry Wong
Saloon Keepers:
• Tim Moores
• Tim Holloway
• Stephan van Hulst
• Carey Brown
• Frits Walraven
Bartenders:
• Piet Souris
• Himai Minh

# Generalized formula for producing numbers from Math.random()?

Ranch Hand
Posts: 158
• Number of slices to send:
Optional 'thank-you' note:
Hi friends,
Is there any Generalized Formula for producing numbers from Math.random().
For example, generate numbers from 3 to 8 by using Math.random()
Regards,
Hassan.

Ranch Hand
Posts: 44
• Number of slices to send:
Optional 'thank-you' note:
You mean like:
(int)((Math.random() * 5)+2)

Ranch Hand
Posts: 3244
• Number of slices to send:
Optional 'thank-you' note:
Trevor
I think you want to add 3 to it to get a number from 3 to 8 because random return a number >= 0 and <1.
Dave

Trevor Green
Ranch Hand
Posts: 44
• Number of slices to send:
Optional 'thank-you' note:
yep, quite right. Maths let me down there.
The key concept is (int)2.999999 = 2.
Casting to an int always rounds down.

Hassan Naqvi
Ranch Hand
Posts: 158
• Number of slices to send:
Optional 'thank-you' note:
Hi Trevor & Dave.
I mean, can we make a generalized formula for generating numbers with our rquired range.Something like this.
(int)(Math.random() * lower limit )+ upper limit..
where lower limit is in my first post is 3 & upper limit is 8.
That is have a generalized formula in which i have to just put lower & upper limts.
Regards,
Hassan.

 That's a very big dog. I think I want to go home now and hug this tiny ad: free, earth-friendly heat - a kickstarter for putting coin in your pocket while saving the earth https://coderanch.com/t/751654/free-earth-friendly-heat-kickstarter