print

func Print(a …interface{}) (n int, err error)

Print formats using the default formats for its operands and writes to standard output. Spaces are added between operands when neither is a string. It returns the number of bytes written and any write error encountered.

使用其操作数的默认格式打印格式并写入标准输出。当两个操作数都不是字符串时，在两个操作数之间添加空格。它返回写入的字节数和遇到的任何写入错误。

▾ Example

  1. package main
  3. import (
  4.     "fmt"
  5. )
  7. func main() {
  8.     const name, age = "starkwang", 22
  9.     fmt.Print(name, " is ", age, " years old.\n")
  11.     // It is conventional not to worry about any
  12.     // error returned by Print.
  13. }

starkwang is 22 years old.

func Printf

func Printf(format string, a …interface{}) (n int, err error)

Printf formats according to a format specifier and writes to standard output. It returns the number of bytes written and any write error encountered.

根据格式说明符输出格式，并写入标准输出。它返回写入的字节数和遇到的任何写入错误。

▾ Example

  1. package main
  3. import (
  4.     "fmt"
  5. )
  7. func main() {
  8.     const name, age = "Kim", 22
  9.     fmt.Printf("%s is %d years old.\n", name, age)
  11.     // It is conventional not to worry about any
  12.     // error returned by Printf.
  14. }

func Println

func Println(a …interface{}) (n int, err error)

Println formats using the default formats for its operands and writes to standard output. Spaces are always added between operands and a newline is appended. It returns the number of bytes written and any write error encountered.

使用其操作数的默认格式和写入标准输出的 Println 格式。总是在操作数之间添加空格，并在其后添加一个换行符。它返回写入的字节数和遇到的任何写入错误。

▾ Example

Something 例子

package main

import (
“fmt”
)

func main() {
const name, age = “starkwang”, 22
fmt.Println(name, “is”, age, “years old.”)

  1. // It is conventional not to worry about any
  2. // error returned by Println.

}

Print系列函数会将内容输出到系统的标准输出，区别在于Print函数直接输出内容，Printf函数支持格式化输出字符串，Println函数会在输出内容的结尾添加一个换行符。

  1. func Print(a ...interface{}) (n int, err error)
  2. func Printf(format string, a ...interface{}) (n int, err error)
  3. func Println(a ...interface{}) (n int, err error)

举个简单的例子：

  1. func main() {
  2.     fmt.Print("在终端打印该信息。")
  3.     name := "starkwang"
  4.     fmt.Printf("我是：%s\n", name)
  5.     fmt.Println("在终端打印单独一行显示")
  6. }

执行上面的代码输出：

  1. 在终端打印该信息。我是：starkwang
  2. 在终端打印单独一行显示