Random Number Generation between user input variables in Swift

Question

How can I create a random number between two random numbers that come from user input variables in swift using arc4random().

There are so many answers on this site already for finding a random number between two numbers. — michaelsnowden, Oct 15 '14 at 01:20
possible duplicate of [How does one generate a random number in Apple's Swift language?](http://stackoverflow.com/questions/24007129/how-does-one-generate-a-random-number-in-apples-swift-language) — Kampai, Oct 15 '14 at 06:10

score 0 · Answer 1 · answered Oct 15 '14 at 01:31

A simple way that is easy to understand/implement is to:

Subtract the two numbers
Find a random number on this difference - 1
Add the random number back to the lower of the original two numbers to get a number in between the two.

for example:

let a: UInt32 = 1
let b: UInt32 = 8
let c = b - a - 1

let newRandomNumber = 1 + arc4random_uniform(c)

I'll let you work our what to do if b is the smaller number.

1 Answers1