Beginner / Bit Manipulation / Maths / MISC
1

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

by SJ · June 29, 2018

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:

Output:

Number 48 Divided by 2^4 is: 3

Read about –

Left and Right shift operators.
Multiply with power of 2 without using pow() or * operator

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lipsa patel

The code seems to be incorrect, it’s multiply instead of divide and left shift instead of right shift

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);
}
}