Why does this problem print 0?

Question

int a = 6;
int b = (int)Math.random() * a;
System.out.print(b);

Answer 1

You need to add brackets:

int b = (int)(Math.random() * a);

This calcs first Math.random() * a and then converts it to integer.
Math.random() returns a double between 0 - 1. If you first convert it to integer it gives you always 0.