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?

Solution 1

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...

Solution 2

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.

Solution 3

You can try rand()%21+10;

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

Comments

[Jens Bodal]

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;