main.go 源码
// Copyright © 2018 Inanc Gumus
// Learn Go Programming Course
// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
//
// For more tutorials : https://learngoprogramming.com
// In-person training : https://www.linkedin.com/in/inancgumus/
// Follow me on twitter: https://twitter.com/inancgumus
package main
import (
"fmt"
"os"
"strings"
"time"
)
// ---------------------------------------------------------
// EXERCISE: Days in a Month
//
// Refactor the previous exercise from the if statement
// section.
//
// "Print the number of days in a given month."
//
// Use a switch statement instead of if statements.
// ---------------------------------------------------------
func main() {
if len(os.Args) != 2 {
fmt.Println("Give me a month name")
return
}
year := time.Now().Year()
leap := year%4 == 0 && (year%100 != 0 || year%400 == 0)
days, month := 28, os.Args[1]
if m := strings.ToLower(month); m == "april" ||
m == "june" ||
m == "september" ||
m == "november" {
days = 30
} else if m == "january" ||
m == "march" ||
m == "may" ||
m == "july" ||
m == "august" ||
m == "october" ||
m == "december" {
days = 31
} else if m == "february" {
if leap {
days = 29
}
} else {
fmt.Printf("%q is not a month.\n", month)
return
}
fmt.Printf("%q has %d days.\n", month, days)
}
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