Bit Manipulation

Divide with power of 2 without using pow() or / operator

by

Objective: Given a number n and k, Calculate n / k2 without using pow() or / operator.

Example:

N = 48, k = 4
N/k2 = 3

Approach: Bit Manipulation

  • Right shift the number N by k.
  • N = 48
  • Bit representation: 0 1 1 0 0 0 0
  • Right shift by k = 4
  • 0 1 1 which is the representation of 3.

Java Code:

public class MultiplyByPowerOf2 {
// Left shift the number n by k.
public static void multiply(int n, int k){
System.out.print("Number " + n + " Multiplied by 2^" + k +" is: ");
System.out.println(n<<k);
}
public static void main(String[] args) {
int n = 3;
int k = 4;
multiply(n,k);
}
}

view raw
MultiplyByPowerOf2.java
hosted with ❤ by GitHub

Output:

Number 48 Divided by 2^4 is: 3

Read about –

Related Posts: