C# Program to Swap Two Numbers Without Third Variable

C# programs to swap two numbers without using third variable have been shown here. The algorithm, pseudocode and time complexity of the programs have been covered here. Check here the flowchart of the programs.

Page content(s):

1. Program & Output: Using addition and subtraction

2. Program & Output: Using division and multiplication

Additional content(s):

1. Algorithm (using addition, subtraction)

2. Algorithm (using multiplication, division)

3. Pseudocode (using addition, subtraction)

4. Pseudocode (using multiplication, division)

5. Time Complexity

6. Flowchart

1. C# Program & output to Swap Two Numbers Without Third Variable (Using Addition and Subtraction)

Code has been copied

/* *******************************************
           alphabetacoder.com
 C# program to swap two numbers without third
variable but using arithmetic operators + and -
******************************************* */

using System;

namespace Swap
{
    class Program
    {
        static void Main(string[] args)
        {
            //declare and initialize variable
            int num1 = 5, num2 = 10;

            //show numbers before swapping
            Console.WriteLine("Before swapping: number1 = " + num1 + " and number2 = " + num2);

            //do swapping using + and -
            num1 = num1 + num2;
            num2 = num1 - num2;
            num1 = num1 - num2;

            //show numbers after swapping
            Console.WriteLine("After swapping: number1 = " + num1 + " and number2 = " + num2);

            // wait for user to press any key
            Console.ReadKey();
        }
    }
}

Output

Before swapping: number1 = 5 and number2 = 10

After swapping: number1 = 10 and number2 = 5

2. C# Program & output to Swap Two Numbers Without Third Variable (Using Multiplication and Division)

Code has been copied

/* *******************************************
           alphabetacoder.com
 C# program to swap two numbers without third
variable but using arithmetic operators * and /
******************************************* */

using System;

namespace Swap
{
    class Program
    {
        static void Main(string[] args)
        {
            //declare and initialize character variable
            int num1 = 5, num2 = 10;

            //show numbers before swapping
            Console.WriteLine("Before swapping: number1 = " + num1 + " and number2 = " + num2);

            //do swapping using * and /
            num1 = num1 * num2;
            num2 = num1 / num2;
            num1 = num1 / num2;

            //show numbers after swapping
            Console.WriteLine("After swapping: number1 = " + num1 + " and number2 = " + num2);

            // wait for user to press any key
            Console.ReadKey();
        }
    }
}

Output

Before swapping: number1 = 5 and number2 = 10

After swapping: number1 = 10 and number2 = 5