HLPL2/Hw1/task3.cpp

#include <cmath>
#include <iostream>
#include <string>

using namespace std;

class Hop {
private:
    double maxheight, startTime;
    bool isHalfed;
    const double loss = 0.7;
    const double g = 9.8;

public:
    Hop(double initHeight, bool starter);
    ~Hop();
    double hopTime();
    double getMaxVelocity();
    double getMaxHeight();
    double getPosition(double time);
    double getVelocity(double time);
    double getEndTime();
    void makeHop();
};

Hop::Hop(double initHeight, bool starter)
{
    maxheight = initHeight;
    isHalfed = starter;
    startTime = 0;
}

double Hop::hopTime()
{
    if (isHalfed)
        return sqrt((2 * maxheight) / g);
    return 2 * sqrt((2 * maxheight) / g);
}

double Hop::getPosition(double time)
{
    if (isHalfed)
        return maxheight - g * (time - startTime) * (time - startTime) / 2;
    return (time - startTime) * getMaxVelocity() - g * (time - startTime) * (time - startTime) / 2;
}

double Hop::getVelocity(double time)
{
    if (isHalfed)
        return 0 - g * (time - startTime);
    return getMaxVelocity() - g * (time - startTime);
}

double Hop::getMaxVelocity()
{
    return sqrt(2 * g * maxheight);
}

void Hop::makeHop()
{
    startTime += hopTime();
    maxheight *= 0.7;
    isHalfed = false;
}

double Hop::getEndTime()
{
    return startTime + hopTime();
}

double Hop::getMaxHeight()
{
    return maxheight;
}

Hop::~Hop()
{
}

int main()
{
    double init_height, time;
    int i = 0;
    cout << "Enter initial height in meters: ";
    cin >> init_height;
    cout << "Enter desired time in seconds: ";
    cin >> time;

    if (init_height > 0.0 && time > 0.0) {
        cout << "Modelling...\n";
        Hop a(init_height, true);
        while (a.getEndTime() < time && i < 100) {
            a.makeHop();
            i++;
        }
        if (a.getEndTime() < time && i == 100) {
            cerr << "Too many iterations. Aborting." << endl;
            return 2;
        }
        cout << "Hop №" << i << endl;
        cout << "Height is " << a.getPosition(time) << " m\n";
        cout << "Velocity is " << a.getVelocity(time) << " m/s\n";

        return 0;
    } else {
        cout << "Illegal height or time.\n";
        return 1;
    }

    return 0;
}