fmt.Printf

package main
import (
    "fmt"
    "os"
)
type point struct {
    x, y int
}
func main() {
    p := point{1, 2}
    fmt.Printf("%v\n", p)                        // => {1 2}
    fmt.Printf("%+v\n", p)                       // => {x:1 y:2}
    fmt.Printf("%#v\n", p)                       // => main.point{x:1, y:2}
    fmt.Printf("%T\n", p)                        // => main.point
    fmt.Printf("%t\n", true)                     // => TRUE
    fmt.Printf("%d\n", 123)                      // => 123
    fmt.Printf("%b\n", 14)                       // => 1110
    fmt.Printf("%c\n", 33)                       // => !
    fmt.Printf("%x\n", 456)                      // => 1c8
    fmt.Printf("%f\n", 78.9)                     // => 78.9
    fmt.Printf("%e\n", 123400000.0)              // => 1.23E+08
    fmt.Printf("%E\n", 123400000.0)              // => 1.23E+08
    fmt.Printf("%s\n", "\"string\"")             // => "string"
    fmt.Printf("%q\n", "\"string\"")             // => "\"string\""
    fmt.Printf("%x\n", "hex this")               // => 6.86578E+15
    fmt.Printf("%p\n", &p)                       // => 0xc00002c040
    fmt.Printf("|%6d|%6d|\n", 12, 345)           // => | 12| 345|
    fmt.Printf("|%6.2f|%6.2f|\n", 1.2, 3.45)     // => | 1.20| 3.45|
    fmt.Printf("|%-6.2f|%-6.2f|\n", 1.2, 3.45)   // => |1.20 |3.45 |
    fmt.Printf("|%6s|%6s|\n", "foo", "b")        // => | foo| b|
    fmt.Printf("|%-6s|%-6s|\n", "foo", "b")      // => |foo |b |
    s := fmt.Sprintf("a %s", "string")
    fmt.Println(s)
    fmt.Fprintf(os.Stderr, "an %s\n", "error")
}