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Oct 20th, 2019
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  1. #include <iostream>
  2. using namespace std;
  3. int main()
  4. {
  5. setlocale(LC_ALL, "Russian");
  6. int number;
  7. int N, n, a, d, Sum, k;
  8. cout << "Введите первый член a=" << " " << "Введите номер элемента n=" << " " << "Введите разность d =" << endl;
  9. cin >> a >> n >> d;
  10. cout << "Введите 1 - без цикла или 2 - с циклом" << endl;
  11. cin >> number;
  12. switch (number)
  13. {
  14. case 1:
  15. {
  16. N = a + (n - 1) * d;
  17. cout << "Энный член N= " << N << endl;
  18. Sum = ((a + N) / 2) * n;
  19. cout << "Cумма N первых чисел равно Sum = " << Sum << endl;
  20. break;
  21. }
  22. case 2:
  23. {
  24. N = a + (n - 1) * d;
  25. cout << "Энный член N= " << N << endl;
  26. for (k = 1; k < n - 1; k++)
  27. {
  28. Sum = ((a + N) / 2) * n;
  29. cout << "Сумма N первых чисел равно Sum = " << Sum << endl;
  30. }
  31. break;
  32. }
  33. }
  34. return 0;
  35. }
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