If you need to generate a random number within your app, you have to push aside Objective-C, as there is no class with a built-in random number generator. The alternative is to use C, among the functions available are: **rand()**, **srand()**, **random()**, **srandom()** and **arc4random()**.

**arc4random()** tends to be preferred as it does not require seeding, the function automatically initializes itself.

// Get random value between 0 and 99 int x = arc4random() % 100; // Get random number between 500 and 1000 int y = (arc4random() % 501) + 500; |

Update: thanks Dave Verwer and Kevin Conner for pointing out the advantages of **arc4random_uniform**.

Apple docs:

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

The freely available, and BSD licensed, Mersenne twister also works quite handsomely on the iPhone.

I tend to make a macro to do this:

#define RANDOM_INT(__MIN__, __MAX__) ((__MIN__) + arc4random() % ((__MAX__+1) – (__MIN__)))

Thank you!

thnaks… it helped..

thanks