Printing formatted things in Go with Printf()

Go allows formatting things and printing them using Printf() function (as well as most of other languages). The function is a part of fmt package and works exactly the same as in all other langs:

package main
import "fmt"

func main() {
  fmt.Printf("%d", 123) // 123
}

Here we've printed 123 value as number (%d).

Printing padded numbers

Sometimes you might want to pad numbers with zeros:

fmt.Printf("%05d", 123) // 00123

Which will give 00123 (left pad given number to 5 symbols and using zeros to fill).

Printing booleans

For boolean variables %t format can be used to get text representation:

fmt.Printf("%t", true) // true
fmt.Printf("%t", false) // false

Sprintf() works like Printf(), but returns a string instead of printing it.

Good tutorial and cheat-sheet on possible format options.