Requiring many random numbers

Question

I'm trying to create a mastermind style game to build up my iOS objective c skills. I'm trying to create 6 random numbers between 0 and 9 using the following. I get different numbers when run at different times but all 6 numbers are always the same on each run.

NSNumber *n1 = [[NSNumber alloc]initWithInt:(random() % 10)]; NSNumber *n2 = [[NSNumber alloc]initWithInt:(random() % 10)]; NSNumber *n3 = [[NSNumber alloc]initWithInt:(random() % 10)]; NSNumber *n4 = [[NSNumber alloc]initWithInt:(random() % 10)]; NSNumber *n5 = [[NSNumber alloc]initWithInt:(random() % 10)]; NSNumber *n6 = [[NSNumber alloc]initWithInt:(random() % 10)];

Any help would be very useful.

possible duplicate of 1 2

albertamg
– albertamg

2011-06-12 12:06:29 +00:00
Commented Jun 12, 2011 at 12:06 — albertamg
– albertamg, Commented Jun 12, 2011 at 12:06

Vladimir · Accepted Answer · 2011-06-12 12:05:12Z

Most likely you forgot to seed the random generator(i.e. add the following line before generating random numbers):

srandom(time(NULL));

Anyway, on iPhone you should use arc4random() function - it provides much better results and does not require seeding:

NSNumber *n1 = [[NSNumber alloc]initWithInt:(arc4random() % 10)];

Hi, thanks. Turned out it was me being a muppet. Getting the numbers back out of an array for an alert, I forgot to change the index.

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