Use the fmt.Fprintln function to write formatted data to standard output with newlines

Title: Use the fmt.Fprintln function to write formatted data to the standard output and wrap the line

In the Go language, the fmt package provides a series of functions for formatting input and output. Among them, the fmt.Fprintln function can write formatted data to standard output and add a newline character at the end. This article will introduce how to use the fmt.Fprintln function for output and give corresponding code examples.

First, let’s take a look at the function signature of the fmt.Fprintln function:

func Fprintln(w io.Writer, a ...interface{}) (n int, err error)

Among them, w represents the target to be output, and os.Stdout is usually used to represent the standard output; a represents the data to be formatted for output, which can be one or more parameters. The function returns the number of bytes written and possible errors.

Next, we give a simple example to demonstrate how to use the fmt.Fprintln function for standard output. The code is as follows:

package main

import (
    "fmt"
    "os"
)

func main() {
    name := "Alice"
    age := 20
    score := 98.5

    // 使用fmt.Fprintln将格式化的数据输出到标准输出，并换行
    fmt.Fprintln(os.Stdout, "姓名：", name)
    fmt.Fprintln(os.Stdout, "年龄：", age)
    fmt.Fprintln(os.Stdout, "分数：", score)
}

In the above code, we define name, age and Score has three variables, representing name, age and score respectively. Then, use the fmt.Fprintln function to format the output to standard output, adding a newline character after each line.

When we run the above program, we will see output similar to the following in the standard output:

姓名： Alice
年龄： 20
分数： 98.5

By using the fmt.Fprintln function, we can easily format the data Output to standard output, making sure that each line is followed by a newline character to make the output more readable.

In addition to standard output, the fmt.Fprintln function can also output formatted data to other places that implement the io.Writer interface, such as files, network connections, etc. Just pass in the target object as the first parameter.

In short, the fmt.Fprintln function is a very practical output function in the Go language. It can output formatted data to the standard output and add a newline character at the end. Through the demonstration of the sample code, I believe readers can master how to use this function for output operations. I hope this article can help readers understand and use the fmt.Fprintln function.

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