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【GO】计算指定年月的天数

作者:汶纡 / 发布于2014/11/18/ 589


	package main
	
	import (
	 "fmt"
	 "bufio"
	 "os"
	 "regexp"
	 "strconv"
	)
	
	func main() {
	 year := input("year", "^[0-9]{1}[0-9]{3}$")
	 month := input("month", "^(0{1}[0-9]{1}|1{1}[0-2]{1})$")
	 count(year, month)
	 fmt.Println("Press Enter button to continue ...")
	 reader := bufio.NewReader(os.Stdin)
	 lastInput, _, err := reader.ReadRune()
	 if err != nil {
	 fmt.Fprintln(os.Stderr, "Occur error when input (last) '", lastInput, "':", err)
	 }
	 return
	}
	
	func count(year int, month int) (days int) {
	 if month != 2 {
	 if month == 4 || month == 6 || month == 9 || month == 11 {
	 days = 30
	
	 } else {
	 days = 31
	 fmt.Fprintln(os.Stdout, "The month has 31 days");
	 }
	 } else {
	 if (((year % 4) == 0 && (year % 100) != 0) || (year % 400) == 0) {
	 days = 29
	 } else {
	 days = 28
	 }
	 }
	 fmt.Fprintf(os.Stdout, "The %d-%d has %d days.\n", year, month, days)
	 return
	}
	
	func input(name string, regexpText string) (number int) {
	 var validNumber = false
	 for !validNumber {
	 fmt.Println("Please input a", name, ": ")
	 reader := bufio.NewReader(os.Stdin)
	 inputBytes, _, err := reader.ReadLine()
	 if err != nil {
	 fmt.Fprintln(os.Stderr, "Occur error when input", name, ":", err)
	 continue
	 }
	 inputText := string(inputBytes)
	 validNumber, err = regexp.MatchString(regexpText, inputText)
	 if err != nil {
	 fmt.Fprintln(os.Stderr, "Occur error when match", name, "(", inputText, "):",err)
	 continue
	 }
	 if validNumber {
	 number, err = strconv.Atoi(inputText)
	 if err != nil {
	 fmt.Fprintln(os.Stderr, "Occur error when convert", name, "(", inputText, "):", err)
	 continue
	 }
	 } else {
	 fmt.Fprintln(os.Stdout, "The", name, "(", inputText, ") does not have the correct format!")
	 }
	 }
	 fmt.Println("The input", name, ": ", number)
	 return
	}

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