#include <iostream>
#include <vector>

using namespace std;

int main()
{
    //Ввод данных
    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];
    size_t bin_count;
    cerr<<"Enter bin count:";
    cin>>bin_count;

    //Расчёт гистаграммы
    vector <size_t> bins (bin_count, 0);
    double min=numbers[0];
    double max=numbers[0];

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

    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 ((numbers[i]>=lo) && (numbers[i]<hi))
                {
                    bins[j]++;
                    found = true;
                }
        }
        if (!found)
            {
                bins[bin_count - 1]++;
            }
    }

    //Вывод данных
    const size_t SCREEN_WIDTH = 80;
    const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;

    size_t max_bin=bins[0];
    for (size_t bin:bins)
        if (bin>max_bin)
            max_bin=bin;
    for (size_t bin:bins){
        int height = bin;
        if (max_bin > MAX_ASTERISK){
            height = MAX_ASTERISK * (static_cast<double>(bin) / max_bin);
        }
        if (bin< 100)
            cout<<" ";
        if (bin<10)
            cout<<" ";
        cout<<bin<<"|";
        for (size_t i=0; i<height; i++)
            cout<<"*";
        cout<<endl;
    }
    return 0;
}

код