# Efficiently multiply a number by 7

Here given code implementation process.

``````// C program
// Efficiently multiply a number by 7
#include <stdio.h>

// Perform multiplication by seven
void multiplyBy7(int n)
{
// Equivalent to  n *7
printf("\n %d X 7 = %d", n, ((n << 3) - n));
}
int main(int argc, char
const *argv[])
{
// Test Cases
multiplyBy7(-3);
multiplyBy7(10);
multiplyBy7(5);
multiplyBy7(13);
return 0;
}``````

#### Output

`````` -3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````
``````// Java program
// Efficiently multiply a number by 7
public class Multiply
{
// Perform multiplication by seven
public void multiplyBy7(int n)
{
// Same as num * 7
System.out.print("\n" + n + " X 7 = " + ((n << 3) - n));
}
public static void main(String[] args)
{
// Test Cases
}
}``````

#### Output

``````-3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````
``````// Include header file
#include <iostream>

using namespace std;
// C++ program
// Efficiently multiply a number by 7
class Multiply
{
public:
// Perform multiplication by seven
void multiplyBy7(int n)
{
// Same as num *7
cout << "\n" << n << " X 7 = " << ((n << 3) - n);
}
};
int main()
{
// Test Cases
return 0;
}``````

#### Output

``````-3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````
``````// Include namespace system
using System;
// C# program
// Efficiently multiply a number by 7
public class Multiply
{
// Perform multiplication by seven
public void multiplyBy7(int n)
{
// Same as num * 7
Console.Write("\n" + n + " X 7 = " + ((n << 3) - n));
}
public static void Main(String[] args)
{
// Test Cases
}
}``````

#### Output

``````-3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````
``````<?php
// Php program
// Efficiently multiply a number by 7
class Multiply
{
// Perform multiplication by seven
public	function multiplyBy7(\$n)
{
// Same as num * 7
echo "\n". \$n ." X 7 = ". ((\$n << 3) - \$n);
}
}

function main()
{
}
main();``````

#### Output

``````-3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````
``````// Node Js program
// Efficiently multiply a number by 7
class Multiply
{
// Perform multiplication by seven
multiplyBy7(n)
{
// Same as num * 7
process.stdout.write("\n" + n + " X 7 = " + ((n << 3) - n));
}
}

function main()
{
// Test Cases
}
main();``````

#### Output

``````-3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````
``````#  Python 3 program
#  Efficiently multiply a number by 7
class Multiply :
#  Perform multiplication by seven
def multiplyBy7(self, n) :
#  Same as num * 7
print("\n", n ," X 7 = ", ((n << 3) - n), end = "")

def main() :
#  Test Cases

if __name__ == "__main__": main()``````

#### Output

`````` -3  X 7 =  -21
10  X 7 =  70
5  X 7 =  35
13  X 7 =  91``````
``````#  Ruby program
#  Efficiently multiply a number by 7
class Multiply
#  Perform multiplication by seven
def multiplyBy7(n)
#  Same as num * 7
print("\n", n ," X 7 = ", ((n << 3) - n))
end

end

def main()
#  Test Cases
end

main()``````

#### Output

``````-3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````
``````// Scala program
// Efficiently multiply a number by 7
class Multiply
{
// Perform multiplication by seven
def multiplyBy7(n: Int): Unit = {
// Same as num * 7
print("\n" + n + " X 7 = " + ((n << 3) - n));
}
}
object Main
{
def main(args: Array[String]): Unit = {
var task: Multiply = new Multiply();
// Test Cases
}
}``````

#### Output

``````-3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````
``````// Swift 4 program
// Efficiently multiply a number by 7
class Multiply
{
// Perform multiplication by seven
func multiplyBy7(_ n: Int)
{
// Same as num * 7
print( n ," X 7 = ", ((n << 3) - n));
}
}
func main()
{
// Test Cases
}
main();``````

#### Output

``````-3  X 7 =  -21
10  X 7 =  70
5  X 7 =  35
13  X 7 =  91``````
``````// Kotlin program
// Efficiently multiply a number by 7
class Multiply
{
// Perform multiplication by seven
fun multiplyBy7(n: Int): Unit
{
// Same as num * 7
print("\n" + n + " X 7 = " + ((n shl 3) - n));
}
}
fun main(args: Array < String > ): Unit
{
// Test Cases
}``````

#### Output

``````-3 X 7 = -21
10 X 7 = 70
5 X 7 = 35
13 X 7 = 91``````

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