Go语言计算指定年月天数的方法

本文实例讲述了go语言计算指定年月天数的方法。分享给大家供大家参考。具体实现方法如下：

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
}

希望本文所述对大家的go语言程序设计有所帮助。