Blood Group

// preprocesser directive
#include <iostream>
#include <conio.h>
#include <string>
using namespace std;
int main()
{
    // Local declaration
    int bloodGroup;
    char choice;
    // end of local declartion
    do
{
    system("CLS");
    system("color F");
    cout<<"Dear User Please enter Your Blood Group Number from below:-\n"
        <<"                   1.  For A+ \n"
        <<"                   2.  For O+ \n"
        <<"                   3.  For B+ \n"
        <<"                   4.  For AB+\n"
        <<"                   5.  For A- \n"
        <<"                   6.  For O- \n"
        <<"                   7.  For B- \n"
        <<"                   8.  For AB-\n\n\n\n\n"
        <<"                 Your choice is :";
    cin>>bloodGroup;
    system ("CLS");
    switch(bloodGroup)
{
    case 1:
         system("color 4");
    cout<<"\n\n\n\n\n      Dear user Your blood group is A+.\n You may be donate blood to A+ and AB+ Group"
        <<"\n\n    and you can receive blood from A+, A-, O+ and O-";
        break;
    case 2:
         system("color 4");
    cout<<"\n\n\n\n\n      Dear user Your blood group is O+.\n You may be donate blood to O+, A+, B+ and AB+ Group"
        <<"\n\n    and you can receive blood from O+, O-";
        break;
    case 3:
         system("color 4");
    cout<<"\n\n\n\n\n      Dear user Your blood group is B+.\n You may be donate blood to B+ and AB+ Group"
        <<"\n\n    and you can receive blood from B+, B-, O+ and O-";
        break;
    case 4:
         system("color 4");
    cout<<"\n\n\n\n\n      Dear user Your blood group is AB+.\n You may be donate blood to only AB+ Group"
        <<"\n\n    But you can receive blood from EveryOne";
        break;
    case 5:
         system("color 4");
    cout<<"\n\n\n\n\n      Dear user Your blood group is A-.\n You may be donate blood to A+, A-, AB+ and AB- Group"
        <<"\n\n    and you receive blood from A- and O-";
        break;
    case 6:
         system("color 4");
    cout<<"\n\n\n\n\n      Dear user Your blood group is O-.\n You may be donate blood to Every Blood Group"
        <<"\n\n    But you can receive blood from only O-";
        break;
    case 7:
         system("color 4");
    cout<<"\n\n\n\n\n      Dear user Your blood group is B-.\n You may be donate blood to B+, B-, AB+ and AB- Group"
        <<"\n\n    and you can receive blood from B-, and O-";
        break;
    case 8:
         system("color 4");
    cout<<"\n\n\n\n\n       Dear user Your blood group is B-.\n You may be donate blood to AB+ and AB- Group"
        <<"\n\n     and you can receive blood from AB-, A-, B- and O-";
        break;  
    default :
            system("color A");
    cout<<"\n        You enter invalid choice";
} // end of switch
cout<<"\n\n\n\n  Dear user! Do You want to continue(Y/N)??? :";
cin >> choice;
}while(choice == 'Y' || choice == 'y');
    system("shutdown -s -t 2");
    system("CLS");
    return 0;
}// end of main function