lab-03/main.cpp

#include <iostream>
#include <vector>
#include <math.h>


using namespace std;

    struct Input {
    vector<double>A;
    size_t bin{};
    };

Input
input_data()
{
    size_t n;
    cerr<<"Marks: ";
    cin>>n;

    Input in;
    in.A.resize(n);
     for (size_t i=0; i<n; i++)
    {
        cerr<<"A["<<i<<"]=";
        cin>>in.A[i];
    }

    cerr<<"Rows: ";
    cin>>in.bin;
    return in;
}

void find_minmax(const vector<double>& A, double& min, double& max)
{
    min = A[0];
    for (auto i = 0; i<A.size(); i++)
    {
        if (A[i]<min)
        {
            min = A[i];
        }
    }

    max = A[0];
    for (auto i = 0; i<A.size(); i++)
    {
        if (A[i]>max)
        {
            max = A[i];
        }
    }
}

vector <size_t> make_histogram (const vector<double>& A, size_t bin)
{
    vector<size_t>B(bin);
    size_t max_count;
    double max, min;
    find_minmax(A, min, max);
    double step = (max-min)/(bin);

    for (size_t i=0; i<A.size(); i++)
    {
        for (size_t j=0; j<bin; j++)
        {
            if ((A[i]>=(min+j*step))&&(A[i]<(min+(j+1)*step)))
            {
                B[j]++;
                break;
            }
        }
    }

     for (size_t i=0; i<A.size(); i++)
    {
       if (A[i]== max)
        B[bin-1]++;
    }
    return B;
}

void show_histogram(vector<size_t>B, size_t bin)
{
    for (size_t i=0; i<bin; i++)
    {
        if (B[i]<10)
        {
            cout<<"  ";
        }
        else if (B[i]<100)
        {
            cout<<" ";
        }
        cout<<B[i]<<"|";
        for (size_t j=0; j<B[i]; j++)
        {
            cout<<"*";
        }
        cout<<endl;
    }
}

int main()
{
    Input in = input_data();
    auto B = make_histogram(in.A, in.bin);
    show_histogram (B, in.bin);

    return 0;
}