AC程序,检查输入的日期是否有效

Question

我被要求纠正一个程序,该程序检查用户输入的日期是否合法在C中.我尝试写它但我猜逻辑是不正确的.

//Legitimate date
#include <stdio.h>
void main()
{
    int d,m,y,leap;
    int legit = 0;
    printf("Enter the date\n");
    scanf("%i.%i.%i",&d,&m,&y);
    if(y % 400 == 0 || (y % 100 != 0 && y % 4 == 0))
        {leap=1;}
    if (m<13)
    {
        if (m == 1 || (3 || ( 5 || ( 7 || ( 8 || ( 10 || ( 12 )))))))
            {if (d <=31)
                {legit=1;}}
        else if (m == 4 || ( 6 || ( 9 || ( 11 ) ) ) )
            {if (d <= 30)
                {legit = 1;}}
        else
            {
                        if (leap == 1)
                              {if (d <= 29)
                                    {legit = 1;}}
                        if (leap == 0)
                              {{if (d <= 28)
                                    legit = 1;}}
             }
    }
    if (legit==1)
        printf("It is a legitimate date!\n");
    else
        printf("It's not a legitimate date!");

}

如果月份有31天,我会得到正确的输出,但在剩下的几个月中,如果当天小于32,则输出是合法的.我们的帮助表示赞赏!

Answer 1

我重写你的程序简单易行,我认为这可能会有所帮助

//Legitimate date
#include <stdio.h>

void main()
{
   int d,m,y;
   int daysinmonth[12]={31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
   int legit = 0;

   printf("Enter the date\n");
   scanf("%i.%i.%i",&d,&m,&y);

   // leap year checking, if ok add 29 days to february
   if(y % 400 == 0 || (y % 100 != 0 && y % 4 == 0))
    daysinmonth[1]=29;

   // days in month checking
   if (m<13)
   {
      if( d <= daysinmonth[m-1] )
        legit=1;
   }

   if (legit==1)
      printf("It is a legitimate date!\n");
   else
      printf("It's not a legitimate date!");
}