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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main()
  6.     {
  7.         double sum, Del0;
  8.         int x, n, max;
  9.  
  10.         setlocale(LC_ALL, "");
  11.  
  12.         cout << "Введите max: " << endl;
  13.         cin >> max;
  14.  
  15.         cout << "Введите De10: " << endl;
  16.         cin >> Del0;
  17.  
  18.         x = 3, 14 * 3, 14 / 12;
  19.  
  20.         n = 1;
  21.         sum = 0;
  22.         while (abs(sum - x) < Del0) {
  23.             for (n = 1; n <= max; n++) {
  24.                 sum = sum + pow(-1, n + 1) * 1 / pow(n, 2);
  25.                 cout << "При n = " << n << " сумма равна " << sum << endl;
  26.             }
  27.         } 
  28.  
  29.         cout << "Количество элементов: " << n << endl;
  30.  
  31.     }
Success #stdin #stdout 0s 4228KB
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stdout
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Введите max: 
Введите De10: 
Количество элементов: 1
https://ideone.com/QrgIA2
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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