C - Random numbers between 10 and 30

Question

I have polje[i]=rand()%30+1; for random between 1-30, but how can I make it so it's between 10 and 30?

possible duplicate of [How to generate a random number from within a range - C](http://stackoverflow.com/questions/2509679/how-to-generate-a-random-number-from-within-a-range-c) and of [Generate random numbers uniformly over entire range](http://stackoverflow.com/questions/288739/generate-random-numbers-uniformly-over-entire-range) — , Jul 28 '13 at 14:34
little late but the simplest answer is int random = arc4random_uniform(20) + 10; — Sam B, Apr 03 '16 at 15:42

score 5 · Answer 1 · edited Jul 28 '13 at 14:52

5

polje[i]=rand()%21+10;

The %21, gives you a number between 0 and 20. Adding 10, gives you a number between 10 and 30.

Tricky question...Hope that helps...

edited Jul 28 '13 at 14:52

answered Jul 28 '13 at 14:33

Samir Seetal

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Another way to clarify would be that `21 = (30-10)+1` and `+10` signifies the starting number. So you could have `min = 10; max = 30; range = max - min; polje[i] = rand() % (range + 1) + min;` – Jens Bodal Apr 30 '16 at 18:32

score 1 · Answer 2 · answered Jul 28 '13 at 14:30

1

How about using rand()%20+11? With this you can generate random numbers from 10 to 29. Dint this work? Or try rand()%21+10 This one will be include 30 too.

answered Jul 28 '13 at 14:30

Bhargav Ponnapalli

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score 1 · Answer 3 · answered Jul 28 '13 at 14:34

1

You can try rand()%21+10;

the answer is in the range of (10,30)

answered Jul 28 '13 at 14:34

FoRever

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C - Random numbers between 10 and 30

3 Answers3