cs-lab34/main.cpp

#include <iostream>
#include <vector>
#include <cmath>

using namespace std;

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

Input
input_data()
{

    size_t number_count;
    cin >> number_count;
    Input in;

    in.numbers.resize(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& min, double& max)
{
    max = numbers[0];
    min = numbers[0];
    for(size_t i = 0; i < numbers.size(); i++)
    {
        if (numbers[i] > max) max = numbers[i];
        if (numbers[i] < min) min = numbers[i];
    }
}

void
make_histogram(vector<double>& bins, Input in)
{
    double min, max;
    find_minmax(in.numbers, min, max);
    size_t cor_size = (max - min)/in.bin_count;

    for (size_t i = 0; i < in.numbers.size(); i++)
    {
        bool flag = false;
        for (size_t j = 0; (j < in.bin_count) && !flag; j++)
        {
            auto L = min + j*cor_size;
            auto H = min + (j+1)*cor_size;
            if ((L <= in.numbers[i]) && (in.numbers[i] <= H))
            {
                flag = true;
                bins[j]++;
            }
        }
        if (!flag) bins[in.bin_count-1]++;
    }
}

void
show_histogram_text(vector<double> bins, Input in)
{
    const size_t MAX_ASTERISK = 76;
    int maxb = bins[0];
    size_t H;

    for (size_t j = 1; j < in.bin_count; j++)
    {
        if (bins[j] > maxb) maxb = bins[j];
    }

    for (size_t j = 0; j < in.bin_count; j++)
    {
        if (maxb > MAX_ASTERISK)
        {
            H  = MAX_ASTERISK * (static_cast<double>(bins[j]) / maxb);
        }
        else H = bins[j];
        if (bins[j] < 100) cout << " ";
        if (bins[j] < 10) cout << " ";
        cout << bins[j] << "|";
        for (size_t i = 0; i < H; i++) cout << "*";
        cout << endl;
    }
}

int
main()
{
    auto in = input_data();
    vector<double> bins;
    bins.resize(in.bin_count);
    make_histogram(bins, in);
    show_histogram_text(bins, in);
}