kayladot7

#include<iostream>
using namespace std;

// Neu n la so nguyen to thi tra ve True, nguoc lai False
bool Kiem_Tra_So_Nguyen_To(int n)
{
    if(n < 2)
    {
        return false;
    }

kayladot7

#include<iostream>
using namespace std;

// ham chuc nang Hoan Vi 2 so a va b
void Hoan_Vi(int &a, int &b)
{
    int temp = a;
    a = b;
    b = temp;
//    cout << "\n Gia tri cua a trong ham Hoan Vi: " << a;

kayladot7

#include<iostream>
using namespace std;

int Tinh_Giai_Thua(int n)
{
    int gt = 1;
    for(int i = 2; i <= n; i++)
    {
        gt *= i;
    }

kayladot7

#include<iostream>
using namespace std;

int main()
{
    while (true)
    {
        system("cls"); //lenh xoa man hinh
        // thiet ke menu
        cout << "\n\n\t\t====== MENU ======";

kayladot7

#include<iostream>
using namespace std;

// Nhap ngay sinh cho biet cung hoang dao la cung j?

void Nhap_Thang(int &thang)
{
    do
    {
        cout << "\nNhap thang: ";

kayladot7

#include<iostream>
using namespace std;

// Nhap ngay sinh cho biet cung hoang dao la cung j?

void Nhap_Ngay(int &ngay)
{
    do
    {
        cout << "\nNhap ngay: ";

kayladot7

#include<iostream>
using namespace std;

int main()
{
    int h = 3;
//    Cach 1: dung FOR
//    for(int i = 1; i <= h; i++)
//    {
//        cout << endl;

kayladot7

#include<iostream>
using namespace std;

// Viet chuong trinh nhap vao so nguyen n (n > 0). Tinh tong cac so nguyen tu 1 den n.
int main()
{
    int n;
    do
    {
        cout << "\nNhap so nguyen n: ";

kayladot7

#include<iostream>
using namespace std;

int main()
{
    int n;
    do
    {
        cout << "\nNhap gia tri n: ";
        cin >> n;

kayladot7

#include<iostream>
using namespace std;

int main()
{
    int i = 1;
    int n;
    cout << "\nNhap so nguyen n: ";
    cin >> n;
    while (i <= n)