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

My Personal Notes arrow_drop_up Maths is the language of nature

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