go语言为printf传统中的字符串格式化提供了极好的支持。 以下是常见字符串格式化任务的一些示例。

go提供了几种打印“动词”，设计用于格式化一般的值。 例如，打印 point 结构的一个实例。

如果值是一个结构体，%+v变体将包括结构体的字段名。

%#v变体打印值的go语法表示，即将生成该值的源代码片段。

要打印值的类型，请使用 %t 。格式化布尔是比较直截了当的。有许多格式化整数的选项。对于标准的base-10格式化，请使用％d。

具体的每个函数，可参考示例中的代码 -

所有的示例代码，都放在 f:\worksp\golang 目录下。安装go编程环境请参考：http://www.h3.com/go/go_environment.html

string-formatting.go的完整代码如下所示 -

package main

import "fmt"
import "os"

type point struct {
    x, y int
}

func main() {

    // go offers several printing "verbs" designed to
    // format general go values. for example, this prints
    // an instance of our `point` struct.
    p := point{1, 2}
    fmt.printf("%v\n", p)

    // if the value is a struct, the `%+v` variant will
    // include the struct's field names.
    fmt.printf("%+v\n", p)

    // the `%#v` variant prints a go syntax representation
    // of the value, i.e. the source code snippet that
    // would produce that value.
    fmt.printf("%#v\n", p)

    // to print the type of a value, use `%t`.
    fmt.printf("%t\n", p)

    // formatting booleans is straight-forward.
    fmt.printf("%t\n", true)

    // there are many options for formatting integers.
    // use `%d` for standard, base-10 formatting.
    fmt.printf("%d\n", 123)

    // this prints a binary representation.
    fmt.printf("%b\n", 14)

    // this prints the character corresponding to the
    // given integer.
    fmt.printf("%c\n", 33)

    // `%x` provides hex encoding.
    fmt.printf("%x\n", 456)

    // there are also several formatting options for
    // floats. for basic decimal formatting use `%f`.
    fmt.printf("%f\n", 78.9)

    // `%e` and `%e` format the float in (slightly
    // different versions of) scientific notation.
    fmt.printf("%e\n", 123400000.0)
    fmt.printf("%e\n", 123400000.0)

    // for basic string printing use `%s`.
    fmt.printf("%s\n", "\"string\"")

    // to double-quote strings as in go source, use `%q`.
    fmt.printf("%q\n", "\"string\"")

    // as with integers seen earlier, `%x` renders
    // the string in base-16, with two output characters
    // per byte of input.
    fmt.printf("%x\n", "hex this")

    // to print a representation of a pointer, use `%p`.
    fmt.printf("%p\n", &p)

    // when formatting numbers you will often want to
    // control the width and precision of the resulting
    // figure. to specify the width of an integer, use a
    // number after the `%` in the verb. by default the
    // result will be right-justified and padded with
    // spaces.
    fmt.printf("|%6d|%6d|\n", 12, 345)

    // you can also specify the width of printed floats,
    // though usually you'll also want to restrict the
    // decimal precision at the same time with the
    // width.precision syntax.
    fmt.printf("|%6.2f|%6.2f|\n", 1.2, 3.45)

    // to left-justify, use the `-` flag.
    fmt.printf("|%-6.2f|%-6.2f|\n", 1.2, 3.45)

    // you may also want to control width when formatting
    // strings, especially to ensure that they align in
    // table-like output. for basic right-justified width.
    fmt.printf("|%6s|%6s|\n", "foo", "b")

    // to left-justify use the `-` flag as with numbers.
    fmt.printf("|%-6s|%-6s|\n", "foo", "b")

    // so far we've seen `printf`, which prints the
    // formatted string to `os.stdout`. `sprintf` formats
    // and returns a string without printing it anywhere.
    s := fmt.sprintf("a %s", "string")
    fmt.println(s)

    // you can format+print to `io.writers` other than
    // `os.stdout` using `fprintf`.
    fmt.fprintf(os.stderr, "an %s\n", "error")
}

执行上面代码，将得到以下输出结果 -

f:\worksp\golang>go run string-formatting.go
{1 2}
{x:1 y:2}
main.point{x:1, y:2}
main.point
true
123
1110
!
1c8
78.900000
1.234000e+08
1.234000e+08
"string"
"\"string\""
6865782074686973
0xc042004280
|    12|   345|
|  1.20|  3.45|
|1.20  |3.45  |
|   foo|     b|
|foo   |b     |
a string
an error