A detailed explanation of annotations in golang

Golang is a programming language with relatively high code readability and simplicity. However, when writing code, there are always places where you need to add comments to help explain certain details or increase the readability of the code. In this article, we will introduce something about Golang annotations.

1. Single-line comments

A single-line comment is a way of adding a comment at the end of the line of code, starting with "//". For example:

fmt.Println("Hello, world!") // 打印“Hello, world!”

In the above code, the comment uses the // symbol.

2. Multi-line comments

The syntax of multi-line comments is relatively simple. We can use symbols starting with "/" to comment multi-line code. Add the "/" symbol at the end. For example:

/*
这是一个演示
多行注释的例子
*/

fmt.Println("Hello, world!")

In the above code, the comments use / and / symbols.

3. Function comments

When writing a function, we usually need to add comments to explain in detail the meaning of the function’s parameters and return value. For example:

/*
Add 函数将输入的两个整数相加并返回结果。

x: 整数，第一个加数
y: 整数，第二个加数

返回值：
int：相加结果
*/
func Add(x int, y int) int {
    return x + y
}

In the above code, the function comments explain in detail the meaning of the parameters and return value of the Add function.

4. Comment style

When writing comments, we should follow a certain comment style. There are two commonly used comment styles in Golang: Godoc and Commonmark.

• Godoc style

Godoc style is the comment style recommended by Golang official documentation. It includes the input parameters and return values ​​of the function, function descriptions, examples, etc. For example:

// Add 函数将输入的两个整数相加并返回结果。
//
// 具体示例：
//  sum := Add(1, 2) // sum = 3
//
// 参数：
//  x: 整数，第一个加数
//  y: 整数，第二个加数
//
// 返回值：
//  int: 相加结果
func Add(x int, y int) int {
    return x + y
}

In the above comments, information such as function description, examples, parameters and return values ​​are used.

• Commonmark style

Commonmark style is a comment style widely used by the Golang community. It does not contain the input parameters and return values ​​of the function, only the description and examples of the function. For example:

// Add 函数将输入的两个整数相加并返回结果。
//
// 示例：
//  sum := Add(1, 2) // sum = 3
func Add(x int, y int) int {
    return x + y
}

The above comments only contain function descriptions and examples.

In short, comments are an important part of the code and can improve the readability and maintainability of the code. When writing Golang code, you should follow the corresponding comment specifications and add comments where necessary to make the code easier to understand.

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