cs-lab34/main.cpp

#include <iostream>
#include <vector>
#include <cmath>
using namespace std;

const size_t SCREEN_WIDTH = 80;
const size_t MAX_ASTERISK = SCREEN_WIDTH - 4;

int main() {
    size_t number_count;
    cerr << "Enter number count: ";
    cin >> number_count;

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

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

    size_t bin_count;
    cerr << "Enter bin count: ";
    cin >> bin_count;

    if (bin_count == 0) {
        bin_count = int(sqrt(number_count));
        if (bin_count > 25) {
            bin_count = int(1 + log2(number_count));
            cerr << "Calculated " << bin_count << " bins with Sturges' formula" << endl;
        }
        else {
            cerr << "Calculated " << bin_count << " bins with Empiric formula" << endl;
        }
    }

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

    for (size_t i = 0; i < number_count; i++) {
        bool found = false;
        for (size_t j = 0; (j < (bin_count - 1)) && !found; j++) {
            auto lo = min + j * bin_size;
            auto hi = min + (j + 1) * bin_size;
            if ((lo <= numbers[i]) && (numbers[i] < hi)) {
                bins[j]++;
                found = true;
            }
        }
        if (!found) {
            bins[bin_count - 1]++;
        }
    }

    size_t maxbin = bins[0];
    for (size_t i=1; i < bins.size(); i++){
        if (maxbin < bins[i]){
            maxbin = bins[i];
        }
    }
    if (maxbin <= MAX_ASTERISK){
        for (size_t i = 0; i < bins.size(); i++) {
            cout.width(4);
            cout << bins[i] << "|";
            for (size_t j = 0; j < bins[i]; j++) {
                cout << "*";
            }
            cout << endl;
        }
        return 0;
    } else {
        for (size_t i = 0; i < bins.size(); i++) {
            cout.width(4);
            cout << bins[i] << "|";
            size_t height = static_cast<size_t>(MAX_ASTERISK * (static_cast<double>(bins[i]) / maxbin));
            for (size_t j = 0; j < height; j++) {
                cout << "*";
            }
            cout << endl;
        }
        return 0;
    }
}