Multiply any Number with 4 using Bitwise Operator

We are a Number n and our task is multiply the number with 4 using bit-wise Operator.

Examples:

Input : 4
Output :16

Input :5
Output :20


Explanation Case 1:- n=4 the binary of 4 is 100 and now shift two bit right then 10000 now the number is 16 that is multiply 4*4=16 ans.
Approach :- (n<<2) shift two bit right

C++

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// C++ program to multiply a number with 
// 4 using Bitwise Operator
#include <bits/stdc++.h>
using namespace std;
  
// function the return multiply a number
//  with 4 using bitwise operator
int multiplyWith4(int n)
{
    // returning a number with multipy 
    // with 4 using2 bit shifring right
    return (n << 2);
}
  
// derive function
int main()
{
    int n = 4;
    cout << multiplyWith4(n) << endl;
    return 0;
}

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Java

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// Java program to multiply a number
// with 4 using Bitwise Operator
  
class GFG {
      
// function the return
// multiply a number
// with 4 using bitwise 
// operator
static int multiplyWith4(int n)
{
      
    // returning a number
    // with multipy with 
    // 4 using 2 bit shifting
    // right
    return (n << 2);
}
  
// Driver Code
public static void main(String[] args)
{
    int n = 4;
    System.out.print(multiplyWith4(n));
}
}
  
// This code is contributed by Smitha.

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Python 3

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# Python 3 program to multiply
# a number with 4 using Bitwise
# Operator
  
# function the return multiply
# a number with 4 using bitwise
# operator
def multiplyWith4(n):
  
    # returning a number with
    # multipy with 4 using2
    # bit shifring right
    return (n << 2)
  
# derive function
n = 4
print(multiplyWith4(n))
  
# This code is contributed
# by Smitha

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C#

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// C# program to multiply a number
// with 4 using Bitwise Operator
using System;
  
class GFG {
      
// function the return
// multiply a number
// with 4 using bitwise 
// operator
static int multiplyWith4(int n)
{
      
    // returning a number
    // with multipy with 
    // 4 using 2 bit shifting
    // right
    return (n << 2);
}
  
// Driver Code
public static void Main(String[] args)
{
    int n = 4;
    Console.Write(multiplyWith4(n));
}
}
  
// This code is contributed by Smitha.

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PHP

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<?php
// PHP program to multiply 
// a number with 4 using
// Bitwise Operator
  
// function the return
// multiply a number
// with 4 using bitwise
// operator
function multiplyWith4($n)
{
      
    // returning a number 
    // with multipy with
    // 4 using2 bit 
    // shifting right
    return ($n << 2);
}
  
    // Driver Code
    $n = 4;
    echo multiplyWith4($n),"\n";
  
// This code is contributed by Ajit.
?>

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Output :-

16

Generalization : In general, we can multiply with a power of 2 using bitwise operators. For example, suppose we wish to multiply with 16 (which is 24), we can do it by left shifting by 4.



My Personal Notes arrow_drop_up

It doesnt make sense to hire smart people and tell them what to do we hire smart people so they can tell us what to doo

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