6. Practice.

#include <cstdlib>  // Standard General Utilities Library
#include <cstdio>   // Input/Output operations (C)
#include <iostream> // Input/Output stream objects
#include <iomanip>  // Input/Output manipulator
#include <fstream>  // File input and output
#include <ctime>    // Date and time information
#include <cmath>    // Mathematical operations and transformations

using namespace std;

#define CMax 100

// Class
class skaiciai {
private:
    int a, b, c;
public:
    void priskirti();
    int suma();
    void spausdinti();

    // constructors
    skaiciai();
    skaiciai(int);
    skaiciai(int, int, int);
};

void skaiciai::priskirti() {
    cin >> a >> b >> c;
}

int skaiciai::suma() {
    return a + b + c;
}

void skaiciai::spausdinti() {
    cout << "a = " << a << ", b = " << b << ", c = " << c << endl;
}

// Class constructors
skaiciai::skaiciai() {
    a = 0;
    b = 0;
    c = 0;
}

skaiciai::skaiciai(int var1, int var2, int var3) {
    a = var1;
    b = var2;
    c = var3;
}

// Class
class nauja: public skaiciai {
public:
    double vidurkis();

    nauja() {};
    nauja(int var1, int var2, int var3): skaiciai(var1, var2, var3) {};
};

double nauja::vidurkis() {
    return suma() / 3.0;
}


// Main program
int main(int argc, char *argv[]) {

    nauja C[5];
    double vidurkis = 0;

    for (int i = 0; i < 5; i++)
    {
        cout << "Iveskite " << i + 1 << " masyvo a, b ir c reiksmes" << endl;
        int v1, v2, v3;
        cin >> v1, v2, v3;
        C[i] = nauja(v1, v2, v3);
        C[i].spausdinti();

        vidurkis += C[i].vidurkis();
    }

    vidurkis /= 5;
    cout << "Masyvu vidurkis: " << vidurkis << endl;


   return 0;
}