Previous power of 2

Question

There is a lot of information on how to find the next power of 2 of a given value (see refs) but I cannot find any to get the previous power of two.

The only way I f

Answer 1

Below code will find the previous power of 2:

int n = 100;
    n /= 2;//commenting this will gives the next power of 2
    n |= n>>1;
    n |= n>>2;
    n |= n>>4;
    n |= n>>16;

System.out.println(n+1);