cpp class example

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main.cpp
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#include "array.h"
#include <iostream>
using std::cin;
using std::cout;
using std::endl;

int main() {
    Array mArrayObj;

    // display 20 random numbers
    mArrayObj.display_num();

    // sort 20 random numbers in
    // asending order
    mArrayObj.asending_sort_array();

    cout << mArrayObj.get_min();  // get minimun number
    cout << " " << mArrayObj.get_max() << endl;  // get maximum number

    cout << mArrayObj.get_mean();
    cout << " " << mArrayObj.get_variance() << endl;

    return 0;
}

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array.h
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#ifndef Array_H
#define Array_H

class Array {
 private:
    unsigned int random_num[20];
    int get_array_length();

 public:
    Array();
    void display_num();
    int get_max();
    int get_min();
    float get_variance();
    float get_mean();
    void asending_sort_array();
};

#endif

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array.cpp
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#include "array.h"
#include <stdlib.h> /* srand, rand nummbers*/
#include <time.h>
#include <iostream>
#include <algorithm>
using std::cin;
using std::cout;
using std::endl;

Array::Array() {
    srand(time(NULL));
    // initialises all 20 numbers of array
    for (int i = 0; i < get_array_length(); i++) {
        random_num[i] = rand() % 100 + 0;  // 0 to 99 random number
    }
}

void Array::display_num() {
    for (int i = 0; i < get_array_length(); i++) {
        cout << random_num[i] << " ";
    }
    cout << endl;
}

int Array::get_max() {
    return random_num[get_array_length() - 1];
}

int Array::get_min() {
    return random_num[0];
}

float Array::get_variance() {
    float square_value = 0, variance = 0;
    for (int i = 0; i < get_array_length(); i++) {
        square_value += (random_num[i]-get_mean())*(random_num[i]-get_mean());
    }
    variance = square_value / get_array_length();

    return variance;
}

float Array::get_mean() {
    float average = 0, sum = 0;

    for (int i = 0; i < get_array_length(); i++) {
        sum = sum + random_num[i];
    }
    average = sum / get_array_length();

    return average;
}

int Array::get_array_length() {
    int length = (sizeof(random_num) / sizeof(random_num[0]));

    return length;
}

void Array::asending_sort_array() {
    std::sort(random_num, random_num + get_array_length());
}