POJ-1006: biorhythms 详解2: 叠加取余

 1 /* ------------------------------
 2  * 叠加取余
 3  * ----------------------------*/
 4 #include "stdio.h"
 5 
 6 #define CYCLE_P 23
 7 #define CYCLE_E 28
 8 #define CYCLE_I 33
 9 
10 int main(void)
11 {
12     int p = 0, e = 0, i = 0, d = 0 ;
13     int count = 0 ;
14     int days = 0 ;
15 
16     while(1)
17     {
18         scanf("%d %d %d %d", &p, &e, &i, &d) ;
19         if(-1 == d)
20             break ;
21 
22         p = p % CYCLE_P ;
23         e = e % CYCLE_E ;
24         i = i % CYCLE_I ;
25         
26         days = d + 1;
27     
28         if(days <= p)
29             days = p ;
30         else    
31             days += CYCLE_P - (days - p) % CYCLE_P ;
32 
33         while(days % CYCLE_E != e)
34             days += CYCLE_P ;
35 
36         while(days % CYCLE_I != i)
37             days += CYCLE_P * CYCLE_E ;    
38 
39         printf("Case %d: the next triple peak occurs in %d days.\r\n",
40             ++count, days - d) ;
41     }
42 
43     return 0 ;
44 }