# Swapping four variables without temporary variable

Suppose we have four variables a, b, c, d and we want to perform swapping of these variables in the following manner
a = b, b = c, c = d, d = a
without using any other fifth or temporary variable

Solution :
Step 1. Swap a and b without using any other variable

a = a + b
b = a – b
a = a – b

Step 2. Swap b and c without using any other varibale

b = b + c
c = b – c
b = b – c

Step 3. Swap c and d without using any other varibale

c = c + d
d = c – d
c = c – d

Examples:

```Input : a = 1, b = 2, c = 3, d = 4
Output :After swapping
a = 2, b = 3, c = 4, d = 1

Input :a = 6, b = 9, c = 10, d = 50
Output : After swapping : a = 9, b = 10, c = 50, d = 6
```

## CPP

 `// CPP program to swap 4 variables without ` `// using temporary variable. ` `#include ` `using` `namespace` `std; ` ` `  `void` `swap(``int` `a, ``int` `b, ``int` `c, ``int` `d) ` `{ ` `    ``// swapping a and b variables ` `    ``a = a + b; ` `    ``b = a - b; ` `    ``a = a - b; ` ` `  `    ``// swapping b and c variables ` `    ``b = b + c; ` `    ``c = b - c; ` `    ``b = b - c; ` ` `  `    ``// swapping c and d variables ` `    ``c = c + d; ` `    ``d = c - d; ` `    ``c = c - d; ` ` `  `    ``cout << ``"values after swapping are : "` `<< endl; ` `    ``cout << ``"a = "` `<< a << endl; ` `    ``cout << ``"b = "` `<< b << endl; ` `    ``cout << ``"c = "` `<< c << endl; ` `    ``cout << ``"d = "` `<< d << endl; ` `} ` ` `  `// driver function ` `int` `main() ` `{ ` `    ``// initialising variables ` `    ``int` `a = 1; ` `    ``int` `b = 2; ` `    ``int` `c = 3; ` `    ``int` `d = 4; ` ` `  `    ``cout << ``"Values before swapping are :"` `<< endl; ` `    ``cout << ``"a = "` `<< a << endl; ` `    ``cout << ``"b = "` `<< b << endl; ` `    ``cout << ``"c = "` `<< c << endl; ` `    ``cout << ``"d = "` `<< d << endl << endl; ` ` `  `    ``swap(a, b, c, d); ` ` `  `    ``return` `0; ` `} `

## Java

 `// Java program to swap 4 variables  ` `// without using temporary variable. ` `class` `GFG { ` `     `  `    ``static` `void` `swap(``int` `a, ``int` `b, ``int` `c, ` `                                   ``int` `d) ` `    ``{ ` `         `  `        ``// swapping a and b variables ` `        ``a = a + b; ` `        ``b = a - b; ` `        ``a = a - b; ` `     `  `        ``// swapping b and c variables ` `        ``b = b + c; ` `        ``c = b - c; ` `        ``b = b - c; ` `     `  `        ``// swapping c and d variables ` `        ``c = c + d; ` `        ``d = c - d; ` `        ``c = c - d; ` `     `  `        ``System.out.println(``"values after "` `                     ``+ ``"swapping are : "``); ` `        ``System.out.println(``"a = "` `+ a); ` `        ``System.out.println(``"b = "` `+ b); ` `        ``System.out.println(``"c = "` `+ c); ` `        ``System.out.println(``"d = "` `+ d); ` `    ``} ` `     `  `    ``// Driver function ` `    ``public` `static` `void` `main(String[] args) ` `    ``{ ` `         `  `        ``// initialising variables ` `        ``int` `a = ``1``; ` `        ``int` `b = ``2``; ` `        ``int` `c = ``3``; ` `        ``int` `d = ``4``; ` `     `  `        ``System.out.println(``"values before "` `                      ``+ ``"swapping are : "``); ` `        ``System.out.println(``"a = "` `+ a); ` `        ``System.out.println(``"b = "` `+ b); ` `        ``System.out.println(``"c = "` `+ c); ` `        ``System.out.println(``"d = "` `+ d); ` `        ``System.out.println(``""``); ` `        ``swap(a, b, c, d); ` `     `  `    ``} ` `} ` ` `  `// This code is contributed by Smitha. `

## Python 3

 `# Python 3 program to swap 4 variables ` `# without using temporary variable. ` ` `  `def` `swap(a, b, c, d): ` ` `  `    ``# swapping a and b variables ` `    ``a ``=` `a ``+` `b ` `    ``b ``=` `a ``-` `b ` `    ``a ``=` `a ``-` `b ` ` `  `    ``# swapping b and c variables ` `    ``b ``=` `b ``+` `c ` `    ``c ``=` `b ``-` `c ` `    ``b ``=` `b ``-` `c ` ` `  `    ``# swapping c and d variables ` `    ``c ``=` `c ``+` `d ` `    ``d ``=` `c ``-` `d ` `    ``c ``=` `c ``-` `d ` ` `  `    ``print``(``"values after swapping are : "``) ` `    ``print``(``"a = "` `, a) ` `    ``print``(``"b = "` `, b) ` `    ``print``(``"c = "` `, c) ` `    ``print``(``"d = "` `, d) ` ` `  ` `  `# driver function ` ` `  `# initialising variables ` `a ``=` `1` `b ``=` `2` `c ``=` `3` `d ``=` `4` ` `  `print``(``"values after swapping are : "``) ` `print``(``"a = "` `, a) ` `print``(``"b = "` `, b) ` `print``(``"c = "` `, c) ` `print``(``"d = "` `, d) ` `print``("") ` `swap(a, b, c, d) ` ` `  `# This code is contributed by Smitha. `

## C#

 `// C# program to swap 4 variables ` `// without using temporary variable. ` `using` `System; ` ` `  `class` `GFG { ` `     `  `    ``static` `void` `swap(``int` `a, ``int` `b, ``int` `c, ` `                                   ``int` `d) ` `    ``{ ` `        ``// swapping a and b variables ` `        ``a = a + b; ` `        ``b = a - b; ` `        ``a = a - b; ` `     `  `        ``// swapping b and c variables ` `        ``b = b + c; ` `        ``c = b - c; ` `        ``b = b - c; ` `     `  `        ``// swapping c and d variables ` `        ``c = c + d; ` `        ``d = c - d; ` `        ``c = c - d; ` `     `  `        ``Console.WriteLine(``"values after "` `                    ``+ ``"swapping are : "``);  ` `        ``Console.WriteLine(``"a = "` `+ a); ` `        ``Console.WriteLine(``"b = "` `+ b); ` `        ``Console.WriteLine(``"c = "` `+ c); ` `        ``Console.WriteLine(``"d = "` `+ d); ` `    ``} ` `     `  `    ``// Driver function ` `    ``public` `static` `void` `Main() ` `    ``{ ` `         `  `        ``// initialising variables ` `        ``int` `a = 1; ` `        ``int` `b = 2; ` `        ``int` `c = 3; ` `        ``int` `d = 4; ` `     `  `        ``Console.WriteLine(``"values before "` `                     ``+ ``"swapping are : "``); ` `        ``Console.WriteLine(``"a = "` `+ a); ` `        ``Console.WriteLine(``"b = "` `+ b); ` `        ``Console.WriteLine(``"c = "` `+ c); ` `        ``Console.WriteLine(``"d = "` `+ d); ` `        ``Console.WriteLine(``""``); ` `        ``swap(a, b, c, d); ` `    ``} ` `} ` ` `  `// This code is contributed by Smitha. `

## PHP

 ` `

Output:

```Values before swapping are :
a = 1
b = 2
c = 3
d = 4

values after swapping are :
a = 2
b = 3
c = 4
d = 1
```

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