cs-lab34/main.cpp

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

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

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 << "bin_count= ";
cin >> in.bin_count;

return in;
}

void
find_minmax(const vector<double>& numbers, double &min, double &max)
{

    min = numbers[0];
    max = numbers[0];
    for (size_t i = 0; i < numbers.size(); i++)
    {
        if (numbers[i] > max)
            max = numbers[i];
        if (numbers[i] < min)
            min = numbers[i];
    }
}

vector <size_t> make_histogram (const vector<double>& numbers, size_t &bin_count)
{
   vector <size_t> bins(bin_count);

   double min, max;
   float low, hi;

   find_minmax(numbers, min, max);

   double bin_size = (max - min) / bin_count;
   low = min;
    hi = low + bin_size;

    for (size_t i = 0; i < numbers.size(); i++)
    {
        bool found = false;

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

void show_histogram_text(const vector<size_t>& bins, size_t &bin_count)
{

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 (int 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, in.bin_count);

    return 0;
}