LabTask1

#include <iostream>
#include <cmath>
using namespace std;
void calculate_speed()
{
    double distance, time, speed;
    cout << "Enter the distance in km: ";
    cin >> distance;
    cout << "Enter the time in hours: ";
    cin >> time;
    if (time != 0)
    {
        speed = distance / time;
        cout << "Speed: " << speed << " km/h" << endl;
    }
    else
    {
        cout << "The time can not be ZERO! Try again." << endl;
    }
}

void calculate_time()
{
    double distance, speed, time;
    cout << "Enter the distance (km): ";
    cin >> distance;
    cout << "Enter the speed (km/h): ";
    cin >> speed;
    if (speed != 0) {
        time = distance / speed;
        cout << "Time: " << time << " h" << endl;
    }
    else
    {
        cout << "The speed cannot be 0!" << endl;
    }
}

void calculate_distance()
{
    double speed, time, distance;
    cout << "Enter the speed (km/h):";
    cin >> speed;
    cout << "Enter the time (hours): ";
    cin >> time;
    distance = speed * time;
    cout << "Distance is " << distance << " km" << endl;
}

void solve_quadratic()
{
    double a, b, c, discriminant, root1, root2;
    cout << "Enter a, b and c ";
    cin >> a >> b >> c;
    discriminant = b * b - 4 * a * c;
    if (discriminant > 0)
    {
        root1 = (-b + sqrt(discriminant)) / (2 * a);
        root2 = (-b - sqrt(discriminant)) / (2 * a);
        cout << "The roots of the equation: " << root1 << " and" << root2 << endl;
    }
    else if (discriminant == 0)
{
        root1 = -b / (2 * a);
        cout << "One root: " << root1 << endl;
    }
    else
    {
        cout << "There are no roots (the discriminant is less than zero)" << endl;
    }
}

int main()
{
    int choice;
    do{
    cout << "Menu:\n";
        cout << "1. Calculate the speed \n";
        cout << "2. Calculate the time \n";
        cout << "3. Calculate the distance \n";
        cout << "4. Solve the quadratic equation \n";
        cout << "5. Exit\n";
        cin >> choice;
        switch (choice)
        {
            case 1:
                calculate_speed();
                break;
            case 2:
                calculate_time();
                break;
            case 3:
                calculate_distance();
                break;
            case 4:
                solve_quadratic();
                break;
            case 5:
                cout << "Exit...\n";
                break;
            default:
                cout << "Wrong choice! Try again.\n";
        }
    }
    while (choice != 5);
    return 0;
}