Commonly used formatting placeholders in Golang

Commonly used formatting placeholders and specific code examples in Golang

In programming, formatting strings is a very important operation that can make the program The output is clearer and easier to read. In the Golang language, we usually use some formatting placeholders to specify the output format. This article will introduce some commonly used formatting placeholders and specific code examples, hoping to help readers better understand and apply these contents.

1. %v: The default format

%v is one of the most commonly used formatting placeholders in Golang. It can be used to output the default format of the variable. For different types of variables, %v will automatically select the corresponding output format according to their specific types.

package main

import "fmt"

func main() {
    num := 10
    str := "Golang"
    float := 3.14

    fmt.Printf("%v
", num)    // 输出整数：10
    fmt.Printf("%v
", str)    // 输出字符串：Golang
    fmt.Printf("%v
", float)  // 输出浮点数：3.14
}

2. %d: Output integer

%d is a formatted placeholder used to output integers. When we need to output variables of integer type, we can use %d to specify the output format.

package main

import "fmt"

func main() {
    num := 100

    fmt.Printf("%d
", num)    // 输出整数：100
}

3. %s: Output string

%s is a formatted placeholder used to output a string. When we need to output a string type variable, we can use %s to specify the output format.

package main

import "fmt"

func main() {
    str := "Hello, World!"

    fmt.Printf("%s
", str)    // 输出字符串：Hello, World!
}

4. %f: Output floating point number

%f is the formatting placeholder used to output floating point number. When we need to output variables of floating point type, we can use %f to specify the output format.

package main

import "fmt"

func main() {
    float := 3.14159

    fmt.Printf("%.2f
", float)    // 输出浮点数：3.14（保留两位小数）
}

5. %t: Output Boolean value

%t is a formatted placeholder used to output Boolean value. When we need to output a Boolean type variable, we can use %t to specify the output format.

package main

import "fmt"

func main() {
    boolVar := true

    fmt.Printf("%t
", boolVar)    // 输出布尔值：true
}

In addition to the above-mentioned common formatting placeholders, there are many other formatting placeholders in Golang. You can choose the appropriate formatting method according to different needs. I hope this article will be helpful to readers and help them become more proficient in using formatted placeholders to output different types of variables.

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