cs-lab34/main.cpp

#include <iostream>
#include <vector>

using namespace std;

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

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

Input
input_data(){
    size_t number_count;
    cerr << "Enter number count:" << endl;
    cin >> number_count;
    Input in;
    in.numbers.resize(number_count);
    vector<double> numbers(number_count);
    cerr << "Enter numbers:" << endl;
    for (size_t i = 0; i < number_count; i++) {
        cin >> in.numbers[i];
    }
    cerr << "Enter bin count:" << endl;
    cin >> in.bin_count;
    return in;
}

void
find_minmax(const std::vector<double>& numbers, double& min, double& max, bool& res){
    if (numbers.size() == 0){
        res = false;
        return;
    }
    min = numbers[0];
    max = numbers[0];
    for (auto x : numbers) {
        if (x < min) {
            min = x;
        }
        else if (x > max) {
            max = x;
        }
    }
}

std::vector<size_t>
make_histogram(const std::vector<double>& numbers, size_t bin_count){
    double min, max;
    bool res = true;
    find_minmax (numbers, min, max, res);
    if (res == false){
        std::cerr << "Number of elements cannot be equal to zero";
        exit(1);
    }
    double bin_size = (max - min) / bin_count;
    std::vector<size_t> bins(bin_count);
    for (auto x : numbers) {
        bool found = false;
        for (size_t j = 0; (j < bin_count - 1) && !found ; j++) {
            if ((min + j * bin_size <= x) && (x < min + (j + 1) * bin_size)) {
                bins[j] += 1;
                found = true;
            }
        }
        if (!found) bins[bin_count - 1]++;
    }
    return bins;
}

void
show_histogram_text(vector<size_t> bins, size_t bin_count ){
    auto max_count = bins[0];
    for (auto x : bins) {
        if (x > max_count) {
            max_count = x;
        }
    }
    for (size_t i = 0; i < bin_count; i++) {
        size_t j = 100;
        while (bins[i] < j) {
            cout << " ";
            j /= 10;
        }
        cout << bins[i] << "|";
        if (max_count > MAX_LENGTH) {
            auto count = bins[i];
            size_t height = MAX_LENGTH * (static_cast<double>(count) / max_count);
            j = 0;
            while (j < height) {
                cout << "*";
                j++;
            }
        }
        else {
           j = 0;
           while (j < bins[i]) {
                cout << "*";
                j++;
            }
        }
        cout << endl;
    }
}
int main() {
    auto in = input_data();
    auto bins = make_histogram(in.numbers, in.bin_count);
    show_histogram_text(bins, in.bin_count);
    return 0;
}