cs-lab34/main.cpp

#include <iostream>
#include <vector>

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;
    cerr << "Enter number of bins: ";
    cin >> in.bin_count;

    in.numbers.resize(number_count);
    cerr << "Enter numbers: ";
    for (size_t i = 0; i < number_count; i++)
    {
        cin >> in.numbers[i];
    }
    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 = numbers[0];
    double max = numbers[0];
    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)
{
    const size_t SCREEN_WIDTH = 80;
    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
    int max_count = bins[0];
    for (size_t i = 0; i < bins.size(); i++)
    {
        if (bins[i] > max_count)
        {
            max_count = bins[i];
        }
    }
    if (max_count > MAX_ASTERISK)
    {
        for (int i = 0; i < bins.size(); i++)
        {
            size_t height = MAX_ASTERISK * (static_cast<double>(bins[i]) / max_count);
            if (bins[i] < 100)
            {
                cout << " ";
                if (bins[i] < 10)
                {
                    cout << " ";
                }
            }
            cout << bins[i] << "|";
            for (size_t j = 0; j < height; j++)
            {
                cout << "*";
            }
            cout << endl;
        }
    }

    else
    {
        for (int i = 0; i < bins.size(); i++)
        {
            if (bins[i] < 100)
            {
                cout << " ";
                if (bins [i] < 10)
                {
                    cout << " ";
                }
            }
            cout << bins[i] << "|";
            for (int j = 0; j < bins[i]; j++)
            {
                cout << "*";
            }
            cout << endl;
        }
    }
}

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