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  • Output Functions

Go has three functions to output text:

  • Print()
  • Println()
  • Printf()

The Print() Function

The Print() function prints its arguments with their default format.

Example

Print the values of i and j:

package main
import ("fmt")

func main() {
  var i,j string = "Hello","World"

  fmt.Print(i)
  fmt.Print(j)
}

Result:

HelloWorld

Example

If we want to print the arguments in new lines, we need to use n.

package main
import ("fmt")

func main() {
  var i,j string = "Hello","World"

  fmt.Print(i, "n")
  fmt.Print(j, "n")
}

Result:

Hello
World

Tip: n creates new lines.

Example

It is also possible to only use one Print() for printing multiple variables.

package main
import ("fmt")

func main() {
  var i,j string = "Hello","World"

  fmt.Print(i, "n",j)
}

Result:

Hello
World

Example

If we want to add a space between string arguments, we need to use " ":

package main
import ("fmt")

func main() {
  var i,j string = "Hello","World"

  fmt.Print(i, " ", j)
}

Result:

Hello World

Example

Print() inserts a space between the arguments if neither are strings:

package main
import ("fmt")

func main() {
  var i,j = 10,20

  fmt.Print(i,j)
}

Result:

10 20

The Println() Function

The Println() function is similar to Print() with the difference that a whitespace is added between the arguments, and a newline is added at the end:

Example

package main
import ("fmt")

func main() {
  var i,j string = "Hello","World"

  fmt.Println(i,j)
}

Result:

Hello World

The Printf() Function

The Printf() function first formats its argument based on the given formatting verb and then prints them.

Here we will use two formatting verbs:

  • %v is used to print the value of the arguments
  • %T is used to print the type of the arguments

Example

package main
import ("fmt")

func main() {
  var i string = "Hello"
  var j int = 15

  fmt.Printf("i has value: %v and type: %Tn", i, i)
  fmt.Printf("j has value: %v and type: %T", j, j)
}

Result:

i has value: Hello and type: string
j has value: 15 and type: int

Tip: Look at all the formatting verbs in the chapter.


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