Multiply with power of 2 without using pow() or * operator

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

Example:

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

Approach: Bit Manipulation

Left shift the number N by k.

For example, N = 3
Bit representation: 0 1 1
Left shift by k = 4
0 1 1 0 0 0 0 which is the representation of 48.

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Java Code:

Output:

Number 3 Multiplied by 2^4 is: 48

Also Read about –

• Left and Right shift operators.
• Divide with power of 2 without using pow() or /operator

Also Read:

- Divide with power of 2 without using pow() or / operator Beginner
- Swap two numbers using Bitwise XOR Operator Medium
- Find the right most set bit of a number Beginner
- Reverse the binary representation of a number. Medium
- Left Shift (<<) and Right Shift (>>) Operators Beginner
- Number of 1’s in bit representation of a number Beginner
- Count Set bits in a given Number Beginner