此程序只用于检查用户输入8位日期合法性

 

 
 
/***********************************************************
* 功能: 此程序只用于检查用户输入8位日期合法性              *
* 函数: int DateVerify()                                 *
* 入口: char *date                                         *
* 出口: Succees: return 0                                  *
*       Faild  : return -1                                 *
* 作者: LinXi                                              *
* 日期: 2002-09-25                                         *
***********************************************************/

#include
#include

int DateVerify(char *date);

int main()
{
    char inputDate[20];
    int  ret=0;

    printf("\nPlease input the date:");
    gets(inputDate);
    ret=DateVerify(inputDate);
    switch (ret)
    {
        case -1:
                printf("[E]: date is faild\n");
                return -1;
                break;
        case 0:
                printf("Success\n");
                break;
    }
    return 0;
}

int DateVerify(char *date)
{
    int i=0;
    int year=0;
    int month=0;
    int day=0;

    /*检查字符长度*/
    if (strlen(date)!=8)
        return -1;

    /*检查字符为数字型*/
    for (i=0;i<8;i++)
    {
        if (date[i]<'0' || date[i]>'9')
            return -1;
    }

    /*按长度取值:YYYYMMDD*/
    sscanf(date,"%4d%2d%2d",&year,&month,&day);

    /*检查年份*/
    if (year<1000 || year>=3000)
        return -1;

    /*检查月份*/
    if (month<1 || month>12)
        return -1;

    /*检查日期*/
    if (day<1 || day>31)
        return -1;

    if (month==4 || month==6 || month==9 || month==11)
    {
        if (day>30)
            return -1;
    }

    if (month==2)
    {
        if ((year%4==0 && year%100!=0) || (year%400==0))
        {
            if (day>29)
                return -1;
        }
        else
        {
            if (day>28)
                return -1;
        }
    }

    printf("\ndate is: %s",date);

    return 0;
}