Trích:
#include<conio.h>
#include<iostream.h>
int main()
{
int day,month,year;
cout<<"Nhap day: ";cin>>day;
cout<<"Nhap month: ";cin>>month;
cout<<"Nhap year: ";cin>>year;
switch(month)
{
case 1: cout<<"Thang mot"<<"/";
break;
case 2: cout<<"Thang hai"<<"/";
break;
case 3: cout<<"Thang ba"<<"/";
break;
case 4: cout<<"Thang tu"<<"/";
break;
case 5: cout<<"Thang nam"<<"/";
break;
case 6: cout<<"Thang sau"<<"/";
break;
case 7: cout<<"Thang bay"<<"/";
break;
case 8: cout<<"Thang tam"<<"/";
break;
case 9: cout<<"Thang chin"<<"/";
break;
case 10: cout<<"Thang muoi"<<"/";
break;
case 11: cout<<"Thang muoi mot"<<"/";
break;
case 12: cout<<"Thang muoi hai"<<"/";
break;
}
cout<<day<<"/19"<<year;
getch();
return 0;
}