Lab9

#include <iostream>

using namespace std;

//for case 1
double f1(double a, double b)
{
    double r = (a - sin(b)) / (a + sin(b));
    return r;
}

//for case 2
double arifm(int a, int b, int c)
{
    double r = (a + b + c) / 3;
    return r;
}

//for case 3
double* mas = nullptr;

int min(double* mas, int n)
{
    double min = mas[0];
    int k = 0;
    for (int i = 0; i < n; i++)
        if (mas[i] < min) {
            min = mas[i];
            k = i;
        }
    return k;
}

void sd(double* mas, int min)
{
    double t = mas[1];
    for (int i = 1; i < min; i++)
        mas[i] = mas[i + 1];
    mas[min - 1] = t;
}

//for case 4
int sum(int n)
{
    int sum = 0;
    do {
        int k = n % 10;
        sum = sum + k;
    } while (n /= 10);
    return sum;
}

int main()
{
    setlocale(LC_ALL, "Russian");
    char ex = 'n';
    do {
        cout << "Введите номер задачи (1, 2, 3 или 4):\n";
        char task;
        cin.ignore(100, '\n');
        cin >> task;
        switch (task)
        {
        case '1':
        {
            double x, y;
            cout << "Enter x and y" << endl;
            cin >> x >> y;
            double z = sqrt(fabs(f1(x, y) + 1.0/f1(y, x))) + exp(f1(x, y));
            cout << z << endl;
        }
        break;
        case '2':
        {
            double a, b, c;
            cout << "Enter a, b, c" << endl;
            cin >> a >> b >> c;
            double arifm1 = arifm(3 * b / c, (b + c) * a, sqrt(c * a));
            double arifm2 = arifm((a - b) / 2 * c, pow(b, c), pow(c * b, 1.0 / a));
            double d = arifm1 - arifm2;
            cout << d << endl;
        }
        break;
        case '3':
        {
            int n;
            cout << "Enter n" << endl;
            cin >> n;
            double* mas = new double[n];
            cout << "Enter mas" << endl;
            for (int i = 0; i < n; i++)
                cin >> mas[i];
            int a = min(mas, n);
            sd(mas, a);
            for (int i = 0; i < n; i++)
                cout << mas[i] << " ";
            delete[]mas;
        }
        break;
        case '4':
        {
            int a, b;
            cout << "Enter a and b" << endl;
            cin >> a >> b;
            int sumA = sum(a);
            int sumB = sum(b);
            if (sumA > sumB)
                cout << "sum of digits a > sum of digits b, sum a = " << sumA << endl;
            else
                cout << "sum of digits b > sum of digits a, sum b = " << sumB << endl;
        }
        break;
        default: {cout << "Нет такой задачи.\n"; } break;
        }
        cout << "Если вы хотите выйти, введите \'y\', в противном случае - любую другую клавишу" << endl;
        cin.ignore(100, '\n');
        cin >> ex;
    } while (ex != 'y');
    return 0;
    system("pause");
}