Xem giúp bài tập cơ bản

#include <iostream>
#include <conio.h>

using namespace std;
void main()
{
    int x(0), y, Temp;
    
    do
    {
    cout<<"Type your choice"<< endl;
    cout<<"1. Convert C to F    2. Convert F to C    3. Exit"<< endl;
    cin>>x; //Nhap x tu ban phim
    
        if (x==1)
        {
            cout<<"Please type Celsius temperature: "<< endl;
            cin>>y;
            Temp = (y*9)/5+32;
            cout<<y<<"C is equal with "<<Temp<<"F"<<endl;
            getch();
            
            
        }
        if (x==2)
        {
            cout<<"Please type Fehranheit temperature: "<< endl;
            cin>>y;
            Temp=(y-32)*5/9;
            cout<<y<<"F is equal with "<<Temp<<"C"<<endl;
            getch();
            system("cls");
        }
        if (x<1 || x>3));
        {
            cout<<"The number is out of range. Press Enter to choose again"<< endl;
            getch();
        }

    }while (x!=3);
}

while (x<1 || x>3);

#include <iostream>#include <conio.h>


using namespace std;
int main()
{
    int x(0), y, Temp;
    
    do
    {
    cout<<"Type your choice"<< endl;
    cout<<"1. Convert C to F    2. Convert F to C    3. Exit"<< endl;
    cin>>x; //Nhap x tu ban phim
    
        if (x==1)
        {
            cout<<"Please type Celsius temperature: "<< endl;
            cin>>y;
            Temp = (y*9)/5+32;
            cout<<y<<"C is equal with "<<Temp<<"F"<<endl;
            getch();
            
            
        }
        if (x==2)
        {
            cout<<"Please type Fehranheit temperature: "<< endl;
            cin>>y;
            Temp=(y-32)*5/9;
            cout<<y<<"F is equal with "<<Temp<<"C"<<endl;
            getch();
            system("cls");
        }
        if(x == 3)
        	return 1; // x = 3 se thoat
        if (x<1 || x>3)
        {
            cout<<"The number is out of range. Press Enter to choose again"<< endl;
            getch();
        }


    }while (x<1 || x > 3);
}

system("pause");
system("cls");