C++ Premier Plus 6th edition - Programming excercise - Chapter11 - 3

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Omit vech.h and vech.cpp

randwalk.cpp (altered)

// randwalk.cpp -- using the Vector class
// compile with the vect.cpp file
#include <iostream>
#include <cstdlib>      // rand(), srand() prototypes
#include <ctime>        // time() prototype
#include "vect.h"

// an meaningful test shall fix value of "steps" and "target"
int main()
{
    using namespace std;
    using VECTOR::Vector;
    srand(time(0));     // seed random-number generator
    double direction;
    Vector step;
    Vector result(0.0, 0.0);
    unsigned long steps = 0;
    double target;
    double dstep;

    cout << "Enter target distance (q to quit): ";
    while (cin >> target)
    {
        cout << "Enter step length: ";
        if (!(cin >> dstep))
            break;

        //Newly added:run N loops,use new to create an double array storing each "steps"
        cout << "Enter value for number N(times you wanna test): ";
        int N;
        cin >> N;

        double*pt = new double[N];
        double max, min;
        double sum = 0;
        double average = 0;

        for (int i = 0; i < N; i++)
        {
            while (result.magval() < target)
            {
                direction = rand() % 360;
                step.reset(dstep, direction, Vector::POL);
                result = result + step;
                steps++;
            }
            // store steps of each test into array
            pt[i] = steps;

            // reset to start next loop
            steps = 0;
            result.reset(0.0, 0.0);
        }

        // calculate min,max
        max = pt[0];
        min = pt[0];
        for (int i = 0; i < N; i++)
        {
            min = (min < pt[i] ? min : pt[i]);
            max = (max > pt[i] ? max : pt[i]);
            sum += pt[i];
        }
        // calculate average
        average = sum / N;

        // dispay max,min,average
        cout << "\nAfter " << N << " tests, report is as blow: \n"
             << "Max: " << max << " steps.\n"
             << "Min: " << min << " steps.\n"
             << "Average: " << (int)average << " steps.\n\n";

        delete[]pt;
        cout << "Enter target distance (q to quit): ";
    }
    cout << "Bye!\n";
    /* keep window open
        cin.clear();
        while (cin.get() != '\n')
            continue;
        cin.get();
    */
    return 0;
}