cs-lab34/lab01/main.cpp

#include <vector>
#include <iostream>
#include <string>
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);
    cerr << "Enter numbers: ";
    for (size_t i = 0; i < number_count; 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 <double>
make_histogram(const vector<double>& numbers, size_t bin_count){
    vector<double> bins (bin_count);

    double min = 0, max = 0;
    find_minmax(numbers, min, max);

    double bin_size = (max - min) / bin_count;
    for (int i = 0; i < numbers.size(); i++) {
            bool found = false;
            for (int 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<double>& bins,size_t MAX_ASTERISK, size_t bin_count){
    double max_count = bins[0];
    for (double x: bins){
        if (x > max_count) {
            max_count = x;
        }
    }

    for (int i = 0; i < bin_count; i++){
        double count = bins[i];
        size_t height = MAX_ASTERISK * (static_cast<double>(count) / max_count);
        string line (height , '*');
        if (bins[i]<100)
            {cout << ' ';}
        if (bins[i]<10)
        {cout << ' ';}
        cout << bins[i] << "|" << line << endl;
    }
}
int main()
{
    const size_t SCREEN_WIDTH = 80;
    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;

    auto in = input_data();
    auto bins = make_histogram(in.numbers, in.bin_count);
    show_histogram_text(bins, MAX_ASTERISK, in.bin_count);
    return 0;
}