# Multiply a number with 10 without using multiplication operator

Given a number, the task is to multiply it with 10 without using multiplication operator?

Examples:

```Input : n = 50
Output: 500
// multiplication of 50 with 10 is = 500

Input : n = 16
Output: 160
// multiplication of 16 with 10 is = 160
```

## Recommended: Please try your approach on {IDE} first, before moving on to the solution.

A simple solution for this problem is to run a loop and add n with itself 10 times. Here we need to perform 10 operations.
A better solution is to use bit manipulation. We have to multiply n with 10 i.e; n*10, we can write this as n*(2+8) = n*2 + n*8 and since we are not allowed to use multiplication operator we can do this using left shift bitwise operator. So n*10 = n<<1 + n<<3.

## C++

 `// C++ program to multiply a number with 10 using ` `// bitwise operators ` `#include ` `using` `namespace` `std; ` ` `  `// Function to find multiplication of n with ` `// 10 without using multiplication operator ` `int` `multiplyTen(``int` `n) ` `{ ` `    ``return` `(n<<1) + (n<<3); ` `} ` ` `  `// Driver program to run the case ` `int` `main() ` `{ ` `    ``int` `n = 50; ` `    ``cout << multiplyTen(n); ` `    ``return` `0; ` `} `

## Java

 `// Java Code to Multiply a number with 10 ` `// without using multiplication operator ` `import` `java.util.*; ` ` `  `class` `GFG { ` `     `  `    ``// Function to find multiplication of n  ` `    ``// with 10 without using multiplication ` `    ``// operator ` `    ``public` `static` `int` `multiplyTen(``int` `n) ` `    ``{ ` `        ``return` `(n << ``1``) + (n << ``3``); ` `    ``} ` `     `  `    ``/* Driver program to test above function */` `    ``public` `static` `void` `main(String[] args)  ` `    ``{ ` `        ``int` `n = ``50``; ` `        ``System.out.println(multiplyTen(n)); ` `        `  `    ``} ` `} ` `   `  `// This code is contributed by Arnav Kr. Mandal. `

## Python 3

 `# Python 3 program to multiply a  ` `# number with 10 using bitwise ` `# operators ` ` `  `# Function to find multiplication ` `# of n with 10 without using ` `# multiplication operator ` `def` `multiplyTen(n): ` ` `  `    ``return` `(n << ``1``) ``+` `(n << ``3``) ` ` `  `# Driver program to run the case ` `n ``=` `50` `print` `(multiplyTen(n)) ` ` `  `# This code is contributed by  ` `# Smitha `

## C#

 `// C# Code to Multiply a number with 10 ` `// without using multiplication operator ` `using` `System; ` ` `  `class` `GFG { ` `     `  `    ``// Function to find multiplication of n  ` `    ``// with 10 without using multiplication ` `    ``// operator ` `    ``public` `static` `int` `multiplyTen(``int` `n) ` `    ``{ ` `        ``return` `(n << 1) + (n << 3); ` `    ``} ` `     `  `    ``// Driver Code ` `    ``public` `static` `void` `Main()  ` `    ``{ ` `        ``int` `n = 50; ` `        ``Console.Write(multiplyTen(n)); ` `         `  `    ``} ` `} ` `     `  `// This code is contributed by Nitin Mittal. `

## PHP

 ` `

Output:

```500
```

This article is contributed by Shashank Mishra ( Gullu ). If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Attention reader! Don’t stop learning now. Get hold of all the important DSA concepts with the DSA Self Paced Course at a student-friendly price and become industry ready.

My Personal Notes arrow_drop_up

Article Tags :
Practice Tags :

Be the First to upvote.

Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.