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1. Random Numbers

   Random int between 0 and N

   NSUInteger r = arc4random_uniform(N);
   

   Random int between 1 and N

   NSUInteger r = arc4random_uniform(N - 1) + 1; // no modulo biais
   

   Random double between 0 and 1

   srand48(time(0));
   double r = drand48();
   

   Source: http://nshipster.com/random/