What is a package that must be included in the Go language?

Title: Packages that must be introduced in Go language

Go language is an open source programming language developed by Google. It has the characteristics of static typing, high concurrency, garbage collection, etc., so it is becoming more and more popular among programmers. In the Go language, a package that must be introduced is "fmt". This article will introduce why the "fmt" package is introduced and specific code examples.

First of all, why is the "fmt" package introduced in the Go language? In the Go language, packages are introduced to facilitate developers to use the functions, types and variables encapsulated in them. The "fmt" package is a package in the Go language standard library, mainly used for formatting input and output. Through the "fmt" package, developers can implement operations such as outputting formatted strings and reading user input from standard input. Therefore, when writing Go programs, almost every program will introduce the "fmt" package to perform output and input operations.

The following is a simple Go program that shows how to import the "fmt" package and use its functions for output:

package main

import "fmt"

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

In the above code, we first use the import "fmt" statement to introduce the "fmt" package, and then use in the main() function fmt.Println()The function outputs the string "Hello, World!". In this example, the "fmt.Println()" function prints content to standard output and adds a newline character after the output content.

In addition to the fmt.Println() function, the "fmt" package also provides other commonly used functions, such as fmt.Printf() for formatting Output, fmt.Scanf() is used to read user input from standard input, etc. Therefore, in the Go language, the introduction of the "fmt" package is an essential part to help developers perform input and output operations.

To sum up, in Go language, a package that must be introduced is "fmt". By introducing the "fmt" package, developers can easily perform formatted output and input operations. I hope this article can help readers understand the importance of introducing packages into the Go language and master how to use the functions in the "fmt" package.

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