What is the golang comment format?

Golang is an emerging programming language developed by Google. It has excellent concurrency performance, garbage collection mechanism and concise syntax, and is widely used in server-side development, cloud computing, big data analysis and other fields. In the Golang program development process, good comment formats can improve the readability of the code and facilitate code maintenance.

1. Types of comments

Golang provides two comment methods: single-line comments and block comments.

1. A single-line comment starts with "//" and is followed by the comment content. Single-line comments are only valid for the current line, and will be invalid if you leave the line.

Example:

func main() {
    var num1 int = 1 // 定义变量num1并赋值为1
    var num2 int = 2 // 定义变量num2并赋值为2
}

2. Block comments start with "/" and end with "/". A "*" sign is added in front of each line of multi-line comments. . Block comments are often used above functions, structures, constants, etc. to give a brief introduction and explanation.

Example:

/* 
* 定义两个常量：pi和e
*/
const (
    pi float64 = 3.1415926535
    e float64 = 2.7182818284
)

2. Specifications for the use of comments

In Golang, comments are not only used to explain the function of the code, but also to avoid errors. The following are the usage specifications of several comments:

1. Header comments

Header comments are used to describe the information of the current file, including function description, author, modification date and version, etc. Header comments should be placed at the beginning of the file so that others can quickly understand the purpose and related information of the file. Header comments can be made in the form of block comments.

Example:

/*
 * 文件名: main.go
 * 作者: 张三
 * 修改时间: 2021年6月1日
 * 版本: v1.0.0
 * 功能说明: Golang程序的入口函数
*/
package main

import "fmt"

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

2. Function comments

Function comments are used to describe the functions, parameters, return values ​​and other information of the function to help others understand the purpose of the function. Function comments should be added above the function declaration in the format of a block comment, where each line of comment begins with an "*" sign.

Example:

/*
* 函数名: add
* 功能: 计算两个整数的和
* 参数: a 表示第一个操作数，b 表示第二个操作数
* 返回值: 两个操作数的和
*/
func add(a int, b int) int {
    return a + b
}

3. Variable comments

Variable comments are used to describe the purpose, type, value range and other information of variables. Variable comments should be added above the variable declaration in the form of a single-line comment.

Example:

var num1 int = 1 // 定义变量num1并赋值为1

4. Constant comments

Constant comments are used to describe the function and value range of constants. Constant comments should be added above the constant declaration in the format of a block comment.

Example:

/*
* 定义两个常量：pi和e
*/
const (
    pi float64 = 3.1415926535
    e float64 = 2.7182818284
)

In short, good comment format can improve code readability and make the code easier to maintain and modify. When writing Golang programs, we might as well develop good comment habits to make our code more elegant, readable and maintainable.

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