cs-lab34/main.cpp

#include <iostream>
#include <vector>

using namespace std;

struct Input {
    vector<double> numbers;
    size_t bin_count = 0;
};

Input input_data() {
    Input in;
    int number_count;

    do {
        cerr << "Enter number count: ";
        cin >> number_count;
    } while (number_count < 1);

    do {
        cerr << "Enter bucket: ";
        cin >> in.bin_count;
    } while (in.bin_count < 1);

    cerr << "\n";

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

    return in;
}

void find_minmax(const vector<double>& numbers, double& min, double& max) {
    if (numbers.empty()) return;

    min = numbers[0];
    max = numbers[0];
    for (double x : numbers) {
        if (x < min) min = x;
        if (x > max) max = x;
    }
}

vector<int> make_histogram(const vector<double>& numbers, size_t bin_count) {
    double min, max;
    find_minmax(numbers, min, max);

    float k = (max - min) / bin_count;
    vector<int> bins(bin_count, 0);

    for (double num : numbers) {
        bool flag = false;
        for (size_t j = 0; j < bin_count && !flag; j++) {
            if (num >= (min + k * j) && num < (min + k * (j + 1))) {
                bins[j]++;
                flag = true;
            }
        }
        if (!flag) bins[bin_count - 1]++;
    }

    return bins;
}

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

    int max_count = 0;
    for (int count : bins) {
        if (count > max_count) max_count = count;
    }

    for (size_t j = 0; j < bins.size(); j++) {
        if (bins[j] < 100) cout << " ";
        if (bins[j] < 10) cout << " ";
        cout << bins[j] << "|";

        size_t height = bins[j];
        if (max_count > MAX_ASTERISK) {
            if (max_count != bins[j]) {
                height = static_cast<size_t>(MAX_ASTERISK * (static_cast<float>(bins[j]) / max_count));
            }
            else if (max_count == bins[j]) {
                height = MAX_ASTERISK;
            }
        }

        for (size_t i = 0; i < height; i++) cout << "*";
        cout << "\n";
    }
}

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

    return 0;
}