cs-lab34/main.cpp

#include <iostream>
#include <vector>

const size_t SCREEN_WIDTH = 80;
const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;

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(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(vector<double>& numbers, size_t bin_count){

    vector<size_t> bins(bin_count);

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

    double bin_size = (max - min) / bin_count;

    for (size_t i = 0; i < numbers.size(); i++) {
        bool found = false; // òåêóùåå ñîñòîÿíèå òåêóùåãî ýëåìåíòà. Ýëåìåíò íå ðàñïðåäåëåí â êîðçèíó
        for (size_t j = 0; (j < bin_count - 1) && !found; j++) { // áåð¸ì j-þ êîðçèíó
            auto lo = min + j * bin_size; // îïðåäåëÿåì ãðàíèöû äàííîé êîðçèíû
            auto hi = min + (j + 1) * bin_size;
            if ((lo <= numbers[i]) && (numbers[i] < hi)) { // ïîäñòàâëÿåì ïîä ýòè ãðàíèöû i-é ýëåìåíò èç numbers
                bins[j]++; // åñëè ýëåìåíò íàõîäèòñÿ â äàííîì äèàïàçîíå (ãðàíèöàõ), òî óâåëè÷èâàåì ñ÷åò÷èê j-îé êîðçèíû
                found = true; // ïåðåêëþ÷àåì "ôëàæîê", ÷òîáû ïðåêðàòèòü ïåðåáîð êîðçèí è ïåðåéòè ê ñäåä. ýë. èç numbers
            }                 // òî åñòü òåïåðü ýëåìåíò ðàñïðåäåëåí â êîðçèíó è íåò íóæäû ïåðåáèðàòü îñòàëüíûå êîðçèíû
        }
        if (!found) { // à åñëè æå âñ¸ òàêè ýë. íå ðàñïðåäåëåí, òî ýòî çíà÷èò, ÷òî îí ïîïàäàåò â ïîñëåäíèé äèàïàçîí
            bins[bin_count - 1]++; // äîáàâëÿåì ýòîò ýë. â ïîñëåäíþþ êîðçèíó
        }
    }
    return bins;
}

void show_histogram_text(vector<size_t>& bins){

    size_t max_count = 0;
    for (size_t x: bins) {
        if (x > max_count) {
                max_count = x;
        }
    }

    if (max_count > MAX_ASTERISK) {
        for (size_t count: bins) {
            size_t height = MAX_ASTERISK * (static_cast<double>(count) / max_count);
            if (count < 10) {
                cout << "  " << count << "|";
            }
            else if (count >= 100) {
                cout << count << "|";
            }

            else {
                cout << " " << count << "|";
            }

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

    else {
        for (size_t x: bins) {
            if (x < 10) {
                cout << "  " << x << "|";
            }
            else if (x >= 100) {
                cout << x << "|";
            }

            else {
                cout << " " << x << "|";
            }

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

}

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