cs-lab34/main.cpp

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

const size_t SCREEN_WIDTH = 80;
const size_t MAX_ASTERISK = SCREEN_WIDTH - 6 - 1;

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

Input
input_data(){
    size_t number_count;
    cin >> number_count;

    Input in;
    in.numbers.resize(number_count);

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

    cin >> in.bin_count;

    return in;
}

void
find_minmax(const vector<double>& numbers, double& min, double& max){
    min = numbers[0];
    max = numbers[0];
    for (double x: numbers){
        if (min > x){
            min = x;
        }
        if (max < x){
            max = x;
        }
    }
}

vector<size_t> make_histogram(const vector<double>& numbers, size_t bin_count){
    double min, max;
    vector <size_t> bins(bin_count);
    find_minmax(numbers, min, max);
    double diff = (max - min) / bin_count;
    size_t max_count = 0;
    for (double x: numbers){
        bool found = false;
        for (size_t j = 0;(j < bin_count - 1) && !found; j++){
            auto lo = min + j * diff;
            auto hi = min + (j + 1) * diff;
            if ((lo <= x) && (hi > x)){
                bins[j]++;
                found = true;
            }
        }
        if(!found){
            bins[bin_count - 1]++;
            if (bins[bin_count - 1] > max_count){
                    max_count = bins[bin_count - 1];
            }
        }
    }
    return bins;
}

void show_histogram_text(const vector<size_t>& bins){
    for (double x: bins){
        cout << "   ";
        if (x < 100){
            cout << " ";
        }
        if (x < 10){
            cout << " ";
        }
        cout << x << "|";

        size_t number_of_stars = x;

        for (size_t j = 0; j < number_of_stars; j++){
            cout << "*";
        }
        cout << endl;
    }

}


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