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Go 有许多字符串插值方法，可以用字符串中的占位符替换变量的值。

Specifiers in Go

Use the fmt.Sprintf() Method

package main

import (
	"fmt"
	"io"
	"os"
)

func main() {

	const string, val = "Hello,", "GoLang is Fun"

	output := fmt.Sprintf("%s World! %s.\n", string, val)

	io.WriteString(os.Stdout, output)

} 

输出结果如下 :

Hello, World! GoLang is Fun.

请注意 ，必须导入 fmt 包才能使用此方法。

Use the Go Specifier Table

package main
import "fmt"
func main() {
    string := "Go language was designed at %s in %d."

    place := "Google"

    year := 2007

    output := fmt.Sprintf(string, place, year)

    fmt.Println(output)
} 

输出结果如下 :

Go language was designed at Google in 2007.

上面的代码片段显示了包含插值表达式的字符串文字。

Use the fmt.Printf() Method

package main

import "fmt"

func square(i int) int {

  return i*i

}

func main() {

fmt.Printf("Square of 2 is %v\n", square(2))
} 

输出结果如下 :

Square of 2 is 4

我们在输出行命令中直接插入了上述代码中的字符串。