Beginner's Guide to Go Language Programming: Learn from Scratch

"Go Language Programming Guide: Learn from scratch, specific code examples are required"

Go language is a programming language developed by Google. It has high efficiency , simple and powerful features, suitable for developing various types of software. This article will provide beginners with a comprehensive introductory guide to Go language, starting from scratch, including basic concepts, syntax, commonly used libraries and specific code examples.

Part One: Environment Setup

First, we need to install the Go language development environment. You can visit the official website (https://golang.org/) to download the installation package for the corresponding operating system and install it according to the prompts. After the installation is complete, you can use the command line to enter go version to verify whether the installation is successful.

Next, create a new Go project. You can execute the following command on the command line:

mkdir hello-go
cd hello-go

Part 2: Basic Concepts

The basic syntax of Go language is similar to C language, with basic concepts including variables, constants, operators, conditional statements, loops, etc. The following is a simple sample code:

package main

import "fmt"

func main() {
    var a, b int
    a, b = 10, 20
    fmt.Printf("a = %d, b = %d
", a, b)

    sum := a b
    fmt.Printf("sum = %d
", sum)

    if sum > 20 {
        fmt.Println("sum is greater than 20")
    } else {
        fmt.Println("sum is less than or equal to 20")
    }
}

Part 3: Commonly used libraries

The Go language has a rich set of standard libraries and third-party libraries that can meet various needs. The following is an example of using the fmt library to output Hello World:

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

Part 4: Practical Exercises

Now, let us implement a simple calculator program. The user enters two numbers and an operator, and the program outputs the calculated result. The following is sample code:

package main

import (
    "fmt"
)

func main() {
    var a, b float64
    var operator string

    fmt.Print("Enter first number: ")
    fmt.Scanln(&a)

    fmt.Print("Enter second number: ")
    fmt.Scanln(&b)

    fmt.Print("Enter operator ( , -, *, /): ")
    fmt.Scanln(&operator)

    var result float64

    switch operator {
    case " ":
        result = a b
    case "-":
        result = a - b
    case "*":
        result = a * b
    case "/":
        if b == 0 {
            fmt.Println("Error: Cannot divide by zero")
            return
        }
        result = a / b
    default:
        fmt.Println("Invalid operator")
        return
    }

    fmt.Printf("Result: %f
", result)
}

Conclusion

Through the guidelines and code examples in this article, I hope readers will have a deeper understanding and mastery of the Go language. Keep learning and practicing, and I believe you will become more and more proficient in this powerful programming language. I hope you can write better programs in the world of Go language!

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