C++练习 | 计算两日期之间天数差 

  1 #include<iostream>
  2 #include<string>
  3 #include<cstring>
  4 using namespace std;
  5 
  6 class Date
  7 {
  8 private:
  9     int year;
 10     int month;
 11     int day;
 12 public:
 13     void get()
 14     {
 15         int a,b,c;
 16         cin>>a;
 17         getchar();
 18         cin>>b;
 19         getchar();
 20         cin>>c;
 21         year=a;
 22         month=b;
 23         day=c;
 24         return;
 25     }
 26     friend int days(Date a,Date b);
 27 };
 28 
 29 int days(Date a,Date b)
 30 {
 31     int day1=0;
 32     Date temp;
 33     if((a.year<b.year)||((a.year==b.year)&&(a.month<b.month))||((a.year==b.year)&&(a.month==b.month)&&(a.day<b.day)))
 34     {
 35         temp=a;
 36         a=b;
 37         b=temp;//保证a比b日期靠后
 38     }
 39     if(a.year!=b.year)
 40     {
 41         day1+=(a.year-b.year-1)*365;//不考虑闰年和不完整年的整年天数
 42         day1+=((((a.year-1)/4) - ((a.year-1)/100) + ((a.year-1)/400))-(((b.year-1)/4) - ((b.year-1)/100) + ((b.year-1)/400)));//期间闰年天数
 43     for(int i=b.month;i<=12;i++)
 44     {
 45         switch(i)
 46         {
 47             case 1:
 48             {
 49                 day1+=31;
 50                 break;
 51             }
 52             case 2:
 53             {
 54                 day1+=28;
 55                 break;
 56             }
 57             case 3:
 58             {
 59                 day1+=31;
 60                 break;
 61             }
 62             case 4:
 63             {
 64                 day1+=30;
 65                 break;
 66             }
 67             case 5:
 68             {
 69                 day1+=31;
 70                 break;
 71             }
 72             case 6:
 73             {
 74                 day1+=30;
 75                 break;
 76             }
 77             case 7:
 78             {
 79                 day1+=31;
 80                 break;
 81             }
 82             case 8:
 83             {
 84                 day1+=31;
 85                 break;
 86             }
 87             case 9:
 88             {
 89                 day1+=30;
 90                 break;
 91             }
 92             case 10:
 93             {
 94                 day1+=31;
 95                 break;
 96             }
 97             case 11:
 98             {
 99                 day1+=30;
100                 break;
101             }
102             case 12:
103             {
104                 day1+=31;
105                 break;
106             }
107         }
108     }
109     day1-=b.day;
110     for(int i=a.month-1;i>=1;i--)
111     {
112         switch(i)
113         {
114             case 1:
115             {
116                 day1+=31;
117                 break;
118             }
119             case 2:
120             {
121                 day1+=28;
122                 break;
123             }
124             case 3:
125             {
126                 day1+=31;
127                 break;
128             }
129             case 4:
130             {
131                 day1+=30;
132                 break;
133             }
134             case 5:
135             {
136                 day1+=31;
137                 break;
138             }
139             case 6:
140             {
141                 day1+=30;
142                 break;
143             }
144             case 7:
145             {
146                 day1+=31;
147                 break;
148             }
149             case 8:
150             {
151                 day1+=31;
152                 break;
153             }
154             case 9:
155             {
156                 day1+=30;
157                 break;
158             }
159             case 10:
160             {
161                 day1+=31;
162                 break;
163             }
164             case 11:
165             {
166                 day1+=30;
167                 break;
168             }
169             case 12:
170             {
171                 day1+=31;
172                 break;
173             }
174         }
175     }
176     day1+=a.day;
177     if(((b.year%4==0&&b.year%100!=0)||(b.year%400==0))&&(b.month>2))
178         day1-=1;
179     if(((a.year%4==0&&a.year%100!=0)||(a.year%400==0))&&(a.month>2))
180         day1+=1;
181     }
182     else
183     {
184         for(int i=b.month;i<a.month;i++)
185         {
186             switch(i)
187             {
188                 case 1:
189                 {
190                     day1+=31;
191                     break;
192                 }
193                 case 2:
194                 {
195                     day1+=28;
196                     break;
197                 }
198                 case 3:
199                 {
200                     day1+=31;
201                     break;
202                 }
203                 case 4:
204                 {
205                     day1+=30;
206                     break;
207                 }
208                 case 5:
209                 {
210                     day1+=31;
211                     break;
212                 }
213                 case 6:
214                 {
215                     day1+=30;
216                     break;
217                 }
218                 case 7:
219                 {
220                     day1+=31;
221                     break;
222                 }
223                 case 8:
224                 {
225                     day1+=31;
226                     break;
227                 }
228                 case 9:
229                 {
230                     day1+=30;
231                     break;
232                 }
233                 case 10:
234                 {
235                     day1+=31;
236                     break;
237                 }
238                 case 11:
239                 {
240                     day1+=30;
241                     break;
242                 }
243                 case 12:
244                 {
245                     day1+=31;
246                     break;
247                 }
248             }
249         }
250         day1+=a.day;
251         day1-=b.day;
252         if(b.month==2&&b.day==29)
253             day1++;
254         if(((a.year%4==0&&a.year%100!=0)||(a.year%400==0))&&(b.month<=2&&b.day!=29&&a.month>2))
255         {
256             day1++;
257         }
258     }
259     return day1;
260 }
261 
262 int main()
263 {
264     Date y1,y2;
265     y1.get();
266     y2.get();
267     cout<<days(y1,y2);
268     return 0;
269 }

 

posted @ 2019-03-27 15:48  洛枫大人  阅读(1428)  评论(2)    收藏  举报