Go Program to Swap Two Variables

Introduction

Swapping two variables is a common operation in programming, where the values of two variables are exchanged. This guide will demonstrate how to write a simple Go program to swap two variables using a temporary variable.

Problem Statement

Create a Go program that:

• Prompts the user to enter two numbers.
• Swaps the values of the two numbers.
• Displays the values after swapping.

Example:

• Input: a = 5, b = 10
• Output: a = 10, b = 5

Solution Steps

1. Import the fmt Package: Use import "fmt" to include the fmt package for formatted I/O operations.
2. Write the Main Function: Define the main function, which is the entry point of every Go program.
3. Declare Variables: Declare variables to store the two numbers and a temporary variable to assist in the swapping process.
4. Input the Numbers: Use fmt.Scanln to take input from the user for the two numbers.
5. Swap the Values: Use a temporary variable to swap the values of the two numbers.
6. Display the Swapped Values: Use fmt.Println to display the values after swapping.

Go Program

package main

import "fmt"

/**
 * Go Program to Swap Two Variables
 * Author: https://www.javaguides.net/
 */
func main() {
    // Step 1: Declare variables to hold the numbers and a temporary variable
    var a, b, temp int

    // Step 2: Prompt the user to enter the first number
    fmt.Print("Enter the first number (a): ")
    fmt.Scanln(&a)

    // Step 3: Prompt the user to enter the second number
    fmt.Print("Enter the second number (b): ")
    fmt.Scanln(&b)

    // Step 4: Swap the values using a temporary variable
    temp = a
    a = b
    b = temp

    // Step 5: Display the swapped values
    fmt.Println("After swapping, the values are:")
    fmt.Println("a =", a)
    fmt.Println("b =", b)
}

Explanation

Step 1: Declare Variables

• The variables a and b are declared as integers to store the two input numbers. A temporary variable temp is used to assist in swapping the values.

Step 2: Input the First Number

• The program prompts the user to enter the first number, which is stored in the variable a.

Step 3: Input the Second Number

• The program prompts the user to enter the second number, which is stored in the variable b.

Step 4: Swap the Values

• The value of a is assigned to temp, then b is assigned to a, and finally temp is assigned to b. This effectively swaps the values of a and b.

Step 5: Display the Swapped Values

• The program displays the values of a and b after swapping.

Output Example

Example:

Enter the first number (a): 5
Enter the second number (b): 10
After swapping, the values are:
a = 10
b = 5

Conclusion

This Go program illustrates how to swap two variables using a temporary variable. Swapping values is a fundamental concept in programming and is useful in various scenarios, such as sorting algorithms and data manipulation. This example provides a clear understanding for beginners learning Go programming.