changing probability of getting a random number

Question

I would like to generate a random number between 0 and 3 and I have the following in my code:

int random = rand() % 4;

This works fine but

Answer 1

how many numbers have you tested this on? if it is actually true you can instead generate a range from say 0->3999 using a = rand()%4000 and use int = a/1000 this should remove the weight of the apparently under produced zero.