cs-lab34/main.cpp

#include <vector>
#include <iostream>

using namespace std;

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

Input input_data()
{
    size_t number_count;
    cerr << "Enter number count: ";
    cin >> number_count;

    Input in;
    in.numbers.resize(number_count);

    vector<double> numbers(number_count);
    for (int i = 0; i < number_count; i++)
    {
        cerr << "Number[" << i << "]=";
        cin >> in.numbers[i];
    }

    cerr << "Enter bin count: ";
    cin >> in.bin_count;
    return in;
}

void find_minmax(const vector <double> &numbers, double &min, double &max)
{
    min = numbers[0];
    max = numbers[0];
    for (double x : numbers)
    {
        if (x < min)
        {
            min = x;
        }
        else if (x > max)
        {
            max = x;
        }
    }
}
vector<size_t> make_histogram(const vector<double> &numbers, size_t bin_count)
{
    double min, max;
    find_minmax(numbers, min, max);
    double bin_size = (max - min) / bin_count;
    vector <size_t> bins (bin_count);

    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 = min + j * bin_size;
            auto hi = min + (j+1) * bin_size;
            if ((lo <= numbers[i]) && (numbers[i] < hi))
            {
                bins[j]++;
                found = true;
            }
        }
        if (!found)
        {
            bins[bin_count - 1]++;
        }
    }
    return bins;
}

void show_histogram_text(const vector<size_t>& bins, size_t& bin_count, double bin_size)
{
    const size_t SCREEN_WIDTH = 80;
    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
    size_t max_bin_count = bins[0];
    for(size_t i = 0; i < bin_count; i++)
    {
        if(bins[i] > max_bin_count)
        {
            max_bin_count = bins[i];
        }
    }

    for(size_t i = 0; i < bin_count; i++)
    {
        if(bins[i]<10)
        {
            cout<< "  " << bins[i] << "|";
        }
        else
        {
            if(bins[i]<100)
            {
                cout<< " " << bins[i] << "|";
            }
            else
            {
                if(bins[i]<1000)
                {
                    cout<< bins[i] << "|";
                }

            }
        }

        size_t height;
        if(max_bin_count <= MAX_ASTERISK)
        {
            height = bins[i];
        }
        else
        {
            height = MAX_ASTERISK * (static_cast<double>(bins[i]) / max_bin_count);
        }
        for(size_t j = 0; j < height;  j ++)
        {
            cout<<"*";
        }
        cout<<endl;
    }
}

int main()
{
    Input in = input_data();
    auto bins = make_histogram(in.numbers, in.bin_count);

    double min, max;

    double bin_size = (max - min) / in.bin_count;

    show_histogram_text(bins,in.bin_count, bin_size);

    return 0;
}