cs-34/main.cpp

#include <iostream>
#include <vector>
#include <limits>

using namespace std;

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

// Ñòðóêòóðà äëÿ âõîäíûõ äàííûõ
struct Input {
    vector<double> numbers;
    size_t bin_count{};
};

// Ôóíêöèÿ ââîäà äàííûõ
Input
input_data() {
    Input in;
    size_t number_count;

    cerr << "Enter number count: ";
    cin >> number_count;

    in.numbers.resize(number_count);
    cerr << "Enter " << number_count << " numbers: ";
    for (size_t i = 0; i < number_count; i++) {
        cin >> in.numbers[i];
    }

    cerr << "Enter bin count: ";
    cin >> in.bin_count;

    return in;
}

// Ôóíêöèÿ ïîèñêà ìèíèìóìà è ìàêñèìóìà
void
find_minmax(const vector<double>& numbers, double& min, double& max) {
    min = numeric_limits<double>::max();
    max = numeric_limits<double>::lowest();

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

// Ôóíêöèÿ ñîçäàíèÿ ãèñòîãðàììû
vector<size_t>
make_histogram(const vector<double>& numbers, size_t bin_count) {
    double min, max;
    find_minmax(numbers, min, max);

    if (max == min) {
        return vector<size_t>(bin_count, numbers.size());
    }

    double bin_size = (max - min) / bin_count;
    vector<size_t> bins(bin_count, 0);

    for (double x : numbers) {
        size_t bin_index = static_cast<size_t>((x - min) / bin_size);
        if (bin_index >= bin_count) bin_index = bin_count - 1;
        bins[bin_index]++;
    }

    return bins;
}

// Ôóíêöèÿ âûâîäà ãèñòîãðàììû
void
show_histogram_text(const vector<size_t>& bins) {
    size_t max_count = 0;
    for (size_t count : bins) {
        if (count > max_count) max_count = count;
    }

    cerr << "Bin counts:" << endl;

    for (size_t j = 0; j < bins.size(); j++) {
        size_t height = (max_count > MAX_ASTERISK)
            ? static_cast<size_t>(MAX_ASTERISK * (static_cast<double>(bins[j]) / max_count))
            : bins[j];

        if (bins[j] < 10) {
            cout << "  " << bins[j] << "|";
        } else if (bins[j] < 100) {
            cout << " " << bins[j] << "|";
        } else {
            cout << bins[j] << "|";
        }

        for (size_t k = 0; k < height; k++) cout << "*";
        cout << endl;
    }
}

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

    return 0;
}