C语言实现两个日期间隔天数计算

整体思路：

1>给定闰年和平年相对应的数组

2>判断给定的起始日期和现在日期是否处于同一年，如果是同一年，判断这年是闰年还是平年

2.1>判断起始日期和现在日期是否在同一个月，如果是，间隔天数等于日期相减

2.2>起始日期和现在日期不在同一个月，利用for循环来相加间隔月份的天数+起始日期到起始月份的剩余天数+现在日期的天数即为间隔天数

3>起始日期和现在日期不在同一年的情况下，利用while循环以此判定间隔的年份是闰年还是平年,记数+

3.1>判断起始年份和现在年份是闰年还是平年

3.2>利用闰年和平年数组来计算起始日期和现在日期在本年的天数

3.3>间隔天数= 闰年计数器*366+平年计数器 *365+起始日期在起始年份的天数+现在日期在现在年份的天数

 

#include<stdio.h>
int main()
{
 int star_year, star_month,star_day;
 int now_year,now_month,now_day;
 int i,r = 0 ,p = 0 ;
 int total = 0;

 int runnian[13]= {0,31,29,31,30,31,30,31,31,30,31,30,31};
 int pingnian[13]= {0,31,28,31,30,31,30,31,31,30,31,30,31};

 printf("input the star_year,star_month,star_day:(xxxx-xx-xx)");
 scanf("%d-%d-%d",&star_year,&star_month,&star_day);
 printf("input the now_year,now_month,now,day:(xxxx-xx-xx)");
 scanf("%d-%d-%d",&now_year,&now_month,&now_day);
//判断是否在同一年
 if(now_year-star_year == 0)
 {
  if((star_year % 4 == 0 && star_year % 100 != 0) || star_year % 4 == 0) //闰年
  {
    if(now_month - star_month == 0) //判断是否在同一个月
    {
      printf("total %d\n",now_day-star_day);
    }
    else
    {
     for(i = star_month + 1; i < now_month  ; i++)//不在同一个月，相加间隔月数
     {
      total = total + runnian[i];
     }
      total = total + runnian[star_month]-star_day + now_day;
      printf("total %d\n",total);
    }
  }
  else //不是闰年的情况
   {
     if(now_month - star_month == 0)
     {
      printf("total %d",now_day-star_day);
     }
     else
     {
      for(i = star_month + 1; i < now_month  ; i++)
      {
       total = total + pingnian[i];
      }
      total = total + pingnian[star_month]-star_day + now_day;
      printf("total %d\n",total);
         }
   }
 }

 else// 不在同一年的情况
 {
  while(now_year > star_year + 1)//用计数器计算间隔年份闰年和平年的个数
  {
   if(((star_year + 1) % 4 == 0 && (star_year + 1) % 100 != 0) || (star_year + 1) % 4 == 0)
   {
    r++ ;
   }
   else
   {
    p++ ;
   }
   star_year ++ ;
  }
  //判断起始年和现在年是闰年还是平年，并计算
  if((star_year % 4 == 0 && star_year % 100 != 0) || star_year % 4 == 0)
  {
   if((now_year % 4 == 0 && now_year % 100 != 0) || now_year % 4 == 0)
    {
      for(i = star_month + 1;i <= 12 ; i ++)
        {
        total = total + runnian[i];
      }
        total = total + runnian[star_month] - star_day;
       for(i = 0 ; i < now_month ;i++)
       {
        total = total + runnian[i];
       }
        total = total + now_day + r * 366 + p * 365;
        printf("total %d\n",total);
    }
   else
    {
     for(i = star_month + 1;i <= 12 ; i ++)
     {
       total = total + runnian[i];
     }
      total = total + runnian[star_month] - star_day;
     for(i = 0 ; i < now_month ;i++)
      {
        total = total + pingnian[i];
      }
      total = total + now_day + r * 366 + p * 365;
      printf("total %d\n",total);
    }
  }
  else
    {
      if((now_year % 4 == 0 && now_year % 100 != 0) || now_year % 4 == 0)
       {
        for(i = star_month + 1;i <= 12 ; i ++)
         {
          total = total + runnian[i];
         }
           total = total + runnian[star_month] - star_day;
        for(i = 0 ; i < now_month ;i++)
         {
           total = total + runnian[i];
         }
        total = total + now_day + r * 366 + p * 365;
        printf("total %d\n",total);
       }
      else
       {
        for(i = star_month + 1;i <= 12 ; i ++)
           {
            total = total + runnian[i];
           }
           total = total + runnian[star_month] - star_day;
        for(i = 0 ; i < now_month ;i++)
         {
           total = total + runnian[i];
         }
        total = total + now_day + r * 366 + p * 365;
        printf("total %d\n",total);
       }
      else
       {
        for(i = star_month + 1;i <= 12 ; i ++)
           {
            total = total + runnian[i];
           }
        total = total + runnian[star_month] - star_day;
        for(i = 0 ; i < now_month ;i++)
          {
            total = total + pingnian[i];
          }
           total = total + now_day + r * 366 + p * 365;
           printf("total %d\n",total);
       }
    }
 }
}

　　有什么错误欢迎大佬指正！谢谢