http://play.golang.org/p/3YP3gdwpFG

printf-examples.go

package main

/*
http://play.golang.org/p/3YP3gdwpFG
*/

import "fmt"

func main() {
	s := "This is a string."
	b := []byte("This is a slice of bytes")

	fmt.Println("## Strings and Bytes ##\n")

	// As characters
	fmt.Printf("%s\n", b)
	fmt.Printf("%q\n", b)
	fmt.Println()

	fmt.Println(b)         // default
	fmt.Printf("%#v\n", b) // in go syntax
	fmt.Println()

	fmt.Printf("%x\n", s)  // hex string
	fmt.Printf("% x\n", b) // hex string with spaces

	m := map[string]int{"dollars": 1000, "friends": 4}

	fmt.Println("\n## Maps and Structs ##\n")
	fmt.Printf("%v\n", m) // default

	fmt.Printf("%#v\n", m) // go syntax
	fmt.Println()

	type T struct {
		a int
		b float64
		c string
	}

	t := &T{4, 10.2, "hey"}

	fmt.Printf("%v\n", t)  // default
	fmt.Printf("%+v\n", t) // default with field names
	fmt.Printf("%#v\n", t) // go syntax
}