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This commit is contained in:
Mark McGranaghan 2012-11-01 06:59:07 -07:00
parent 7d952d673a
commit c85ea7b5d3
1 changed files with 19 additions and 19 deletions
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38
examples/string-formatting/string-formatting.go
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@ -17,36 +17,36 @@ func main() {
// format general Go values. For example, this prints // format general Go values. For example, this prints
// an instance of our `point` struct. // an instance of our `point` struct.
p := point{1, 2} p := point{1, 2}
fmt.Printf("%v \n", p) fmt.Printf("%v\n", p)
// If the value is a struct, the `%+v` variant will // If the value is a struct, the `%+v` variant will
// include the struct's field names. // include the struct's field names.
fmt.Printf("%+v \n", p) fmt.Printf("%+v\n", p)
// The `%#v` variant prints a Go syntax representation // The `%#v` variant prints a Go syntax representation
// of the value, i.e. the source code snippet that // of the value, i.e. the source code snippet that
// would produce that value. // would produce that value.
fmt.Printf("%#v \n", p) fmt.Printf("%#v\n", p)
// To print the type of a value, use `%T`. // To print the type of a value, use `%T`.
fmt.Printf("%T \n", p) fmt.Printf("%T\n", p)
// Formatting booleans is straight-forward. // Formatting booleans is straight-forward.
fmt.Printf("%t \n", true) fmt.Printf("%t\n", true)
// There are many options for formatting integers. // There are many options for formatting integers.
// Use `%d` for standard, base-10 formatting. // Use `%d` for standard, base-10 formatting.
fmt.Printf("%d \n", 123) fmt.Printf("%d\n", 123)
// This prints a binary representation. // This prints a binary representation.
fmt.Printf("%b \n", 14) fmt.Printf("%b\n", 14)
// This prints the character corresponding to the // This prints the character corresponding to the
// given integer. // given integer.
fmt.Printf("%c \n", 33) fmt.Printf("%c\n", 33)
// `%x` provides hex encoding. // `%x` provides hex encoding.
fmt.Printf("%x \n", 456) fmt.Printf("%x\n", 456)
// There are also several formatting options for // There are also several formatting options for
// floats. For basic decimal formatting use `%f`. // floats. For basic decimal formatting use `%f`.
@ -54,22 +54,22 @@ func main() {
// `%e` and `%E` format the float in (slightly // `%e` and `%E` format the float in (slightly
// different versions of) scientific notation. // different versions of) scientific notation.
fmt.Printf("%e \n", 123400000.0) fmt.Printf("%e\n", 123400000.0)
fmt.Printf("%E \n", 123400000.0) fmt.Printf("%E\n", 123400000.0)
// For basic string printing use `%s`. // For basic string printing use `%s`.
fmt.Printf("%s \n", "\"string\"") fmt.Printf("%s\n", "\"string\"")
// To double-quote strings as in Go source, use `%q`. // To double-quote strings as in Go source, use `%q`.
fmt.Printf("%q \n", "\"string\"") fmt.Printf("%q\n", "\"string\"")
// As with integers as seen earlier, `%x` renders // As with integers as seen earlier, `%x` renders
// the string in base-16, with two output characters // the string in base-16, with two output characters
// per byte of input. // per byte of input.
fmt.Printf("%x \n", "hex this") fmt.Printf("%x\n", "hex this")
// To print a representation of a pointer, use `%p`. // To print a representation of a pointer, use `%p`.
fmt.Printf("%p \n", &p) fmt.Printf("%p\n", &p)
// When formatting numbers you will often want to // When formatting numbers you will often want to
// control the width and precision of the resulting // control the width and precision of the resulting
@ -77,16 +77,16 @@ func main() {
// number after the `%` in the verb. By default the // number after the `%` in the verb. By default the
// result will be right-justified and padded with // result will be right-justified and padded with
// spaces. // spaces.
fmt.Printf("|%6d|%6d| \n", 12, 345) fmt.Printf("|%6d|%6d|\n", 12, 345)
// You can also specify the width of printed floats, // You can also specify the width of printed floats,
// though usually you'll also want to restrict the // though usually you'll also want to restrict the
// decimal precision at the same time with the // decimal precision at the same time with the
// width.precision syntax. // width.precision syntax.
fmt.Printf("|%6.2f|%6.2f| \n", 1.2, 3.45) fmt.Printf("|%6.2f|%6.2f|\n", 1.2, 3.45)
// To left-justify, use the `-` flag. // To left-justify, use the `-` flag.
fmt.Printf("|%-6.2f|%-6.2f| \n", 1.2, 3.45) fmt.Printf("|%-6.2f|%-6.2f|\n", 1.2, 3.45)
// You may also want to control width when formatting // You may also want to control width when formatting
// strings, especially to ensure that they align in // strings, especially to ensure that they align in
@ -104,5 +104,5 @@ func main() {
// You can format+print to `io.Writers` other than // You can format+print to `io.Writers` other than
// `os.Stdout` using `Fprintf`. // `os.Stdout` using `Fprintf`.
fmt.Fprintf(os.Stderr, "an %s \n", "error") fmt.Fprintf(os.Stderr, "an %s\n", "error")
} }