KT So Hoan Thien

#include <iostream>
#define MAX 100000
using namespace std;
void nhapsonguyenduong(int &n)
{
	do
	{
		cout << "Nhap so de kiem tra = ";
		cin >> n;
		if (n < 0 || n>MAX)
		{
			cout << "so nhap vao khong hop le, kiem tra lai";
		}
	} while (n < 0 || n>MAX);
}
int kiemtrasohoanhao(int &n)
{
	int sum = 0;
		for (int i = 1; i <=n/2; i++)
		{
			if (n%i == 0)
			{
				sum = sum + i;
			}
		}
	if (sum == n)
		return true;
	else
		return false;
}
void main()
{
	int n;
	nhapsonguyenduong(n);
	if (kiemtrasohoanhao(n) == true)
		cout << n << " day la so hoan hao" << endl;
	else
		cout <<n<< "day khong phai la so hoan hao";
	system("\npause");
}