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- #include <iostream>
- using namespace std;
- int main()
- {
- setlocale(LC_ALL, "Russian");
- int number;
- int N, n, a, d, Sum, k;
- cout << "Введите первый член a=" << " " << "Введите номер элемента n=" << " " << "Введите разность d =" << endl;
- cin >> a >> n >> d;
- cout << "Введите 1 - без цикла или 2 - с циклом" << endl;
- cin >> number;
- switch (number)
- {
- case 1:
- {
- N = a + (n - 1) * d;
- cout << "Энный член N= " << N << endl;
- Sum = ((a + N) / 2) * n;
- cout << "Cумма N первых чисел равно Sum = " << Sum << endl;
- break;
- }
- case 2:
- {
- N = a + (n - 1) * d;
- cout << "Энный член N= " << N << endl;
- for (k = 1; k < n - 1; k++)
- {
- Sum = ((a + N) / 2) * n;
- cout << "Сумма N первых чисел равно Sum = " << Sum << endl;
- }
- break;
- }
- }
- return 0;
- }
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