cs-lab34/main.cpp

#include <iostream>
#include <vector>

using namespace std;

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

Input input_data()
{
    size_t number_count;
    cerr << "Number count: ";
    cin >> number_count;
    Input in;
    in.numbers.resize(number_count);

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

    vector<size_t> bins(bin_count);
    for (double x : numbers) {
        size_t bin_index = (x - min) / (max - min) * bin_count;
        if (bin_index == bin_count) bin_index--;
        bins[bin_index]++;
    }
    return bins;
}

void show_histogram_text(const vector<size_t>& bins) {
    const size_t SCREEN_WIDTH = 80;
    size_t max_count = 0;
    for (size_t count : bins) {
        if (count > max_count) max_count = count;
    }

    for (size_t bin : bins) {
        size_t height = bin * SCREEN_WIDTH / max_count;
        for (size_t i = 0; i < height; i++) {
            cout << '*';
        }
        cout << endl;
    }
}

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