Let's talk about knowledge about Golang program annotations

Golang program comments refer to adding appropriate comments to the code to explain the function, logic, and implementation of specific functions of the code, etc. Comments can make the code clearer and easier to understand, making it easier for other developers to understand the code. In this article, we will introduce the relevant knowledge of Golang program annotations.

1. Basic types of Golang program comments

Golang supports three comment types: single-line comments, multi-line comments and document comments.

1. Single-line comments

Single-line comments are mainly used to comment specific content on a certain line of code to provide a more readable explanation in the code. In Golang, single-line comments start with double slashes (//), and each line can only contain one comment. When the compiler encounters a double slash, it ignores everything after the double slash on that line.

Example:

package main

import "fmt"

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

2. Multi-line comments

Multi-line comments are widely used in Golang programming, mainly used to comment on a piece of code but not limited to single row. Golang's multi-line comments start and end with /**/, and the commented content can occupy multiple lines.

Example:

package main

import "fmt"

func main() {
    /*
    输出Hello, World!
    第二行注释...
    */
    fmt.Println("Hello, World!")
}

3. Documentation comments

In Golang, documentation comments are a special type of comments that are used to generate API documentation . Golang's documentation comments start and end with / /, which can provide documentation for functions, types, and variables.

Example:

package main

import "fmt"

// Person struct
type Person struct {
    name string
    age int
}

// SayHi prints greeting message
func (p *Person) SayHi() {
    fmt.Printf("Hi, my name is %s and I'm %d years old\n", p.name, p.age)
}

/*
Package main
This is a sample program to illustrate go comments. 
*/
func main() {
    person := Person{"John", 28}
    person.SayHi()
}

2. How to write good comments

Written comments can make the code more readable, and can also express the meaning and structure of the code. and logic. Here are some key points for writing good comments:

1. Describe the purpose of the code

Describe the role and purpose of the code in the comment. Explain why this code is necessary and what exactly it does. This way other developers can better understand the code.

2. Explain the non-obvious parts

Explain code that is not self-explanatory. For example, if you use a less common algorithm, explain what it means and how it works.

3. Precise wording

Make sure your comments are worded accurately. Be careful when using technical terms to avoid causing ambiguity.

4. Describe the purpose of variables and functions

Describe the purpose and purpose of variables and functions. If a variable or function is used in a specific algorithmic or logical context, explain why the variable or function is needed.

5. Comment only the necessary content

Do not comment out every function or variable. Try to use self-describing function and variable names, and only add comments when you really need them.

6. Keep comments updated

Over time, code may change, and sometimes comments need to be updated. Make sure your comments are up to date, accurate, and in sync with the code.

3. Conclusion

Through the introduction of this article, we know the basic types of Golang program comments and the key points of well-written comments. Comments can make code easier to understand and maintain, and help developers handle large amounts of code. Therefore, we strongly recommend that you add comments while writing your code to understand it better.

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