cs-lab34/main.cpp

#include <iostream>
#include <vector>

using namespace std;

struct Input
{
    vector<double> numbers;
    size_t bin_count{};
};

Input
input_data()
{
    Input in;
    size_t number_count;
    cin >> number_count;
    in.numbers.resize(number_count);

    vector<double> numbers(number_count);

    for (size_t i = 0; i < number_count; i++)
    {
        cin >> in.numbers[i];
    }

    cin >> in.bin_count;
    return in;
}

void find_minmax( const vector<double>& numbers, double& minN, double& maxN)
{
    minN = numbers[0];
    maxN = numbers[0];

    for (double x: numbers)
    {
        if (minN > x)
        {
            minN = x;
        }
        if (maxN < x)
        {
            maxN = x;
        }
    }
}

vector<size_t> make_histogram(const vector<double>& numbers, size_t bin_count)
{
    double minN, maxN;
    find_minmax( numbers, minN, maxN);

    vector <size_t> bins(bin_count);
    double diff = (maxN - minN) / bin_count;
    size_t max_count = 0;
    for (size_t i = 0; i <numbers.size() ; i++)
    {
        bool found = false;
        for (size_t j = 0; (j < bin_count - 1) && !found; j++)
        {
            auto lo = minN + j * diff;
            auto hi = minN + (j + 1) * diff;
            if ((lo <= numbers[i]) && (hi > numbers[i]))
            {
                bins[j]++;
                if (bins[j] > max_count)
                {
                    max_count = bins[j];
                }
                found = true;
            }
        }
        if(!found)
        {
            bins[bin_count - 1]++;
            if (bins[bin_count - 1] > max_count)
            {
                max_count = bins[bin_count - 1];
            }
        }
    }
    return bins;
}

void show_histogram_text(const vector <size_t>& bins,size_t bin_count, size_t max_count)
{
    const size_t SCREEN_WIDTH = 80;
    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;

    bool scaling = false;

    if (max_count > MAX_ASTERISK)
    {
        scaling = true;
    }

    for (size_t i = 0; i < bin_count; i++)
    {
        if (bins[i] < 10)
        {
            cout << "  ";
        }
        else if (bins[i] < 100)
        {
            cout << " ";
        }
        else
        {
            cout << "";
        }
        cout << bins[i] << '|';

        size_t number_of_stars = bins[i];

        if (scaling)
        {
            if (bins[i] == max_count)
            {
                number_of_stars = MAX_ASTERISK * 1.0;
            }
            else
            {
                number_of_stars = MAX_ASTERISK * (static_cast<double>(bins[i]) / max_count);
            }
        }

        for (size_t j = 0; j < number_of_stars; j++)
        {
            cout << '*';
        }
        cout << endl;
    }
}

int main()
{
    size_t max_count;
    auto in = input_data();
    auto bins = make_histogram(in.numbers, in.bin_count);
    show_histogram_text(bins, in.bin_count, max_count);
}