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51 lines
869 B
Go
Executable File
51 lines
869 B
Go
Executable File
// print.go
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package main
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import (
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"os"
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"strconv"
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)
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type Stringer interface {
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String() string
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}
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type Celsius float64
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func (c Celsius) String() string {
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return strconv.FormatFloat(float64(c), 'f', 1, 64) + " °C"
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}
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type Day int
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var dayName = []string{"Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"}
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func (day Day) String() string {
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return dayName[day]
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}
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func print(args ...interface{}) {
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for i, arg := range args {
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if i > 0 {
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os.Stdout.WriteString(" ")
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}
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switch a := arg.(type) { // type switch
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case Stringer:
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os.Stdout.WriteString(a.String())
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case int:
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os.Stdout.WriteString(strconv.Itoa(a))
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case string:
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os.Stdout.WriteString(a)
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// more types
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default:
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os.Stdout.WriteString("???")
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}
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}
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}
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func main() {
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print(Day(1), "was", Celsius(18.36)) // Tuesday was 18.4 °C
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}
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// Tuesday was 18.4 °C
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