Go Program to Concatenate Two Strings

Introduction

String concatenation is the process of combining two or more strings into a single string. This is a common operation in programming, often used to build messages, combine data, or format output. This guide will demonstrate how to write a Go program that concatenates two strings.

Problem Statement

Create a Go program that:

• Prompts the user to enter two strings.
• Concatenates the two strings.
• Displays the concatenated string.

Example:

• Input:
  • String 1: "Hello, "
  • String 2: "World!"
• Output: "Hello, World!"

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. Input the Strings: Use fmt.Scanln or fmt.Scanf to take input from the user for the two strings.
4. Concatenate the Strings: Use the + operator to concatenate the two strings.
5. Display the Concatenated String: Use fmt.Println to display the concatenated string.

Go Program

package main

import "fmt"

/**
 * Go Program to Concatenate Two Strings
 * Author: https://www.javaguides.net/
 */
func main() {
    // Step 1: Declare variables to hold the input strings
    var str1, str2 string

    // Step 2: Prompt the user to enter the first string
    fmt.Print("Enter the first string: ")
    fmt.Scanln(&str1)

    // Step 3: Prompt the user to enter the second string
    fmt.Print("Enter the second string: ")
    fmt.Scanln(&str2)

    // Step 4: Concatenate the strings using the + operator
    concatenatedString := str1 + str2

    // Step 5: Display the concatenated string
    fmt.Println("Concatenated string:", concatenatedString)
}

Explanation

Step 1: Declare Variables

• The variables str1 and str2 are declared to store the user’s input strings.

Step 2: Input the First String

• The program prompts the user to enter the first string using fmt.Print. The fmt.Scanln function reads the input and stores it in the str1 variable.

Step 3: Input the Second String

• The program prompts the user to enter the second string in a similar way, storing the input in the str2 variable.

Step 4: Concatenate the Strings

• The + operator is used to concatenate str1 and str2, forming a new string stored in the variable concatenatedString.

Step 5: Display the Concatenated String

• The program prints the concatenated string using fmt.Println.

Output Example

Example 1:

Enter the first string: Hello, 
Enter the second string: World!
Concatenated string: Hello, World!

Example 2:

Enter the first string: GoLang
Enter the second string: is awesome!
Concatenated string: GoLang is awesome!

Conclusion

This Go program demonstrates how to concatenate two strings using the + operator. It covers basic programming concepts such as string manipulation and input/output operations. This example is useful for beginners learning Go programming and understanding how to work with strings and combine them.