Use the `arc4random`

function to generate random numbers in a range.

Suppose you have to generate a random number from 0 to 99. Do:

`int randomNum0to99 = arc4random() % 100;`

Or:

`int randomNum0to99 = arc4random_uniform(100);`

Between the 2 codes, the latter is preferred because:

arc4random_uniform() will return a uniformly distributed random number less than upper_bound.

arc4random_uniform() is recommended over constructions like “arc4random() % upper_bound” as it avoids “modulo bias” when the upper bound is not a power of two.

If you have to generate a random number from 11 to 30, add some math into your code:

`int randomNum0to99 = arc4random_uniform(20) + 11;`

// For **20** numbers and minimum **11**.

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