String Formatting in Go
Go offers excellent support for string formatting in the printf tradition. Here are some examples of common string formatting tasks.
package main
import (
"fmt"
"os"
)
type point struct {
x, y int
}
func main() {
// In these examples we use fmt.Printf to directly output the result on stdout.
// If you wanted to create a string result to be used in a different way,
// you can use fmt.Sprintf instead.
p := point{1, 2}
fmt.Printf("%v\n", p)
fmt.Printf("%+v\n", p)
fmt.Printf("%#v\n", p)
fmt.Printf("%T\n", p)
fmt.Printf("%t\n", true)
fmt.Printf("%d\n", 123)
fmt.Printf("%b\n", 14)
fmt.Printf("%c\n", 33)
fmt.Printf("%x\n", 456)
fmt.Printf("%f\n", 78.9)
fmt.Printf("%e\n", 123400000.0)
fmt.Printf("%E\n", 123400000.0)
fmt.Printf("%s\n", "\"string\"")
fmt.Printf("%q\n", "\"string\"")
fmt.Printf("%x\n", "hex this")
fmt.Printf("%p\n", &p)
fmt.Printf("|%6d|%6d|\n", 12, 345)
fmt.Printf("|%6.2f|%6.2f|\n", 1.2, 3.45)
fmt.Printf("|%-6.2f|%-6.2f|\n", 1.2, 3.45)
fmt.Printf("|%6s|%6s|\n", "foo", "b")
fmt.Printf("|%-6s|%-6s|\n", "foo", "b")
s := fmt.Sprintf("a %s", "string")
fmt.Println(s)
fmt.Fprintf(os.Stderr, "an %s\n", "error")
}