Golang Beginner's Guide to Answering Puzzles: From Installation to Application

Golang Beginner’s Essential Guide: Installation: Go to the Golang official website to download and install the corresponding version. Set environment variables: Set GOPATH and PATH. Create a project: Create a new project root directory and create the main.go file in it. Write Go code: Write Go code and save it into main.go. Run the program: Change to the project root directory and run "go run main.go". Practical case: Calculate the area of ​​a circle, enter the radius interactively through the command line and calculate the area. Common mistakes: Check environment variables, package installation, and syntax errors.

Golang Beginner’s Guide to Answering Confusion: From Installation to Application

Install Golang

1. Go to [Golang official website]( https://go.dev/)
2. Download the installation package corresponding to your system
3. Follow the installation instructions

Set environment variables

1. Open the command line tool or terminal

2. Set GOPATH Environment variable:

   export GOPATH=/path/to/your/go/workspace

3. Set PATH Environment variables:

   export PATH=$PATH:$GOPATH/bin

Create a Go project

1. Create a new directory as the project root directory
2. At the project root Create a file named main.go in the directory

Write your Go code

package main

import "fmt"

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

Run your Go program

1. Switch to the project root directory in the command line tool or terminal

2. Run the following command:

   go run main.go

Practical case: Calculate the area of ​​a circle

package main

import (
    "fmt"
    "math"
)

func main() {
    var radius float64
    fmt.Print("Enter the radius of the circle: ")
    fmt.Scan(&radius)
    area := math.Pi * radius * radius
    fmt.Printf("The area of the circle is: %f", area)
}

Common Errors and Solutions

• go: no such file or directory: Make sure GOPATH/bin is added into your PATH environment variable.
• cannot find package: Make sure the required package is installed and imported.
• syntax error: Double check your code for spelling or grammatical errors.

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