poj: 1003

 1  #include <iostream>
 2  #include <stdio.h>
 3  #include <string.h>
 4  #include <stack>
 5  using namespace std;
 6 
 7  int main()
 8  {
 9      double c;
10      while (cin >> c && c != 0.00) {
11         double L = 0.5;
12         int n = 1;
13         //cout << c << endl;
14         while (L < c) {
15             n++;
16             L += 1 / ((double)n + 1);
17             //cout << "L = " << L << endl;
18         }
19         cout << n << " card(s)" << endl;
20      }
21      return 0;
22  }