Mảng Động ( QBT CODER )

<<<<<<<<<<<<<<<<<Mangdong.h>>>>>>>>>>>>>>>>
#pragma once
#include <iostream>
using namespace std;
class CArrayInt
{
public:
	CArrayInt(int);
	~CArrayInt();
	void input();
	void output();
	void sort();
	int second();
private:
	int n;
	int *arr;
};
<<<<<<<<<<<<<<<<<<.MangDong.cpp>>>>>>>>>>>>>>>>>>>
#include "CArrayInt.h"
void CArrayInt::input() {
	cout << "Nhap kich thuoc cua mang: ";
	cin >> n;
	arr = new int[n];
	for (int i = 0; i < n; i++) {
		cout << "Nhap vao phan tu thu " << i << " la: ";
		cin >> arr[i];
	}
}
void CArrayInt::output() {
	for (int i = 0; i < n; i++) {
		cout << " " << arr[i];
	}
	cout << endl;
}
void CArrayInt::sort() {
	for (int i = 0; i < n - 1; i++) {
		for (int j = i + 1; j < n; j++) {
			if (arr[i] > arr[j]) {
				swap(arr[i], arr[j]);
			}
		}
	}
}

int CArrayInt::second() {
	for (int i = 0; i < n - 1; i++) {
		for (int j = i + 1; j < n; j++) {
			if (arr[i] > arr[j]) {
				swap(arr[i], arr[j]);
			}
		}
	}
	return arr[n - 2];
}
CArrayInt::CArrayInt(int soluong) {
	n = soluong;
	arr = new int[n];
	for (int i = 0; i < n; i++)
	{
		arr[i] = 0;
	}
}
CArrayInt::~CArrayInt() {
	delete[] arr;
}
<<<<<<<<<<<<<<<<<<<<<main.cpp>>>>>>>>>>>>>>>>>>>>
#include"CArrayInt.h"
int main() {
	CArrayInt arr(10);
	arr.input();
	cout << "Arry Not Sort: ";
	arr.output();
	cout << "Array Sort: ";
	arr.sort();
	arr.output();
	cout << "Seccond: " << arr.second();
	return 0;
}