[C语言][100例题]根据年月日判断是一年中的第几天

My_A

1. #include <stdio.h>
   
2. 
   
3. /*
   
4. 题目：输入某年某月某日，判断这一天是这一年的第几天？
   
5.     特殊情况，闰年且输入月份大于3时需考虑多加一天
   
6. */
   
7. 
   
8. typedef enum {
   
9.     Jan = 31,Feb = 28,Mar = 31,Apr = 30,May = 31,June = 30,
   
10.     July = 31,Aug = 31,Sep = 30,Oct = 31,Nov = 30,Dec = 31
    
11. }month_day;
    
12. 
    
13. int _4_main()
    
14. {
    
15.     int count_day = 0;
    
16.     int year,month,day;
    
17.     printf("输入年月日(yyyy-mm-dd):");
    
18.     scanf("%d-%d-%d",&year,&month,&day);
    
19. 
    
20.     count_day += day;
    
21. 
    
22.     // 判断是否是闰年
    
23.     _Bool flag = 0;
    
24.     if(((year%100!= 0)&&(year%4 == 0))||(year%100 != 0)&&(year%400 == 0)) flag == 1;
    
25. 
    
26.     switch (month) {
    
27.     case 12:count_day += Nov;
    
28.     case 11:count_day += Oct;
    
29.     case 10:count_day += Sep;
    
30.     case  9:count_day += Aug;
    
31.     case  8:count_day += July;
    
32.     case  7:count_day += June;
    
33.     case  6:count_day += May;
    
34.     case  5:count_day += Apr;
    
35.     case  4:count_day += Mar;
    
36.     case  3:count_day += (flag ? Feb+1 : Feb);
    
37.     case  2:count_day += Jan;
    
38.     case  1:;
    
39. 
    
40.     }
    
41. 
    
42.     printf("%d-%02d-%02d是一年中的第%d天",year,month,day,count_day);
    
43. 
    
44.     return 0;
    
45. }
    
46. 
    

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