poj: 1005

 1  #include <iostream>
 2  #include <stdio.h>
 3  #include <string.h>
 4  #include <stack>
 5  using namespace std;
 6 
 7  #define PI 3.1415926
 8 
 9  int N;
10 
11  int main()
12  {
13      cin >> N;
14      double x, y;
15      for (int t = 1; t <= N; ++t) {
16         cin >> x >> y;
17         int n = 1;
18         while (1) {
19             double r = n*100/PI;
20             if (x*x + y*y < r) break;
21             n++;
22         }
23         cout << "Property " << t << ": This property will begin eroding in year " << n << "." << endl;
24      }
25      cout << "END OF OUTPUT." << endl;
26      return 0;
27  }