[POJ 1005] I Think I Need a Houseboat C++解题

 1 /*
 2 poj 1000
 3 version:1.0
 4 author:Knight
 5 Email:S.Knight.Work@gmail.com
 6 */
 7 
 8 #include<cstdio>
 9 #include<cmath>
10 using namespace std;
11 const double PI = 3.1415926;
12 int main(void)
13 {
14     double S;//被腐蚀陆地的总面积
15     double r;//腐蚀陆地的半径
16     int i,j;
17     int T;
18     double X,Y;//Fred的坐标
19     double Distance;//Fred据坐标原点的距离
20     scanf("%d", &T);
21     for (i=1; i<=T; i++)
22     {
23         scanf("%lf%lf", &X, &Y);
24         Distance = sqrt(X * X + Y * Y);
25         S = 0.0;
26         for (j=1; ; j++)
27         {
28             S += 50.0;
29             r = sqrt(2 * S / PI);
30             if (r >= Distance)
31             {
32                 break;
33             }
34         }
35         printf("Property %d: This property will begin eroding in year %d.\n", i, j);
36     }
37     printf("END OF OUTPUT.\n");
38     return 0;
39 }