# define _CRT_SECURE_NO_WARNINGS

 # include <stdio.h>

 # include <stdlib.h>

 int days(int month)

 {

     int day;

     switch (month)

     {

         case :

             day = ; //1月天数

             break;

         case :

             day = +; //1+2月天数

             break;

         case :

             day = +  + ; //1+2+3月天数

             break;

         case :

             day = +  +  + ;

             break;

         case :

             day = +  +  +  + ;

             break;

         case :

             day = +  +  +  +  + ;

             break;

         case :

             day = ++  +  +  +  + ;

             break;

         case :

             day = +  +  +  +  +  +  + ;

             break;

         case :

             day = ++  +  +  +  +  +  + ;

             break;

         case :

             day =+  +  +  +  +  +  +  +  + ;

             break;

         case :

             day = ++  +  +  +  +  +  +  +  + ;

             break;

         case :

             day = +  +  +  +  +  +  +  +  +  +  + ; //12个月的天数

             break;

     }

     return day;

 }

 int main()

 {

     int month, day,days1;

     int month_2, day_2,days2;

     int result;

     printf("请输入一个日期\n");

     scanf("%d %d", &month, &day);

     printf("请输入第二个日期\n");

     scanf("%d %d", &month_2, &day_2);

     days1 = days(month) + day; //计算第一个日期的天数

     days2 = days(month_2) + day_2; //计算第二个日期的天数

     //printf("%d %d", days1, days2);

     //大的天数减去小的天数

     if (days1 > days2)

     {

         result = days1 - days2;

     }

     else

     {

         result = days2 - days1;

     }

     printf("\n");

     printf("%d月%d日和%d月%d日间隔%d天\n", month, day, month_2, day_2,result);

     system("pause");

     return ;

 }