What does "unqualified-id before" mean?

[huyettoc]

Could someone please explain to me what the "unqualified-id before" means, how to fix it, what I did wrong, and why it is the way that you say is the correct code?

 
#include<iostream>
#include<String>
using namespace std;
class person
{
      protected :
            char name[40];
      public:
            virtual void getData()
            {
                 cout<<"Nhap vao ten:";
                 cin>>name;
            }
            virtual void putData()
            {
                 cout<<"Ten:"<<name<<"\n";
            }
            virtual void isOutstanding()
 
            {
            } 
}
/////////////////
 
class student:public person
{
      private:
           float tbc;
      public:
           virtual void getData()
           {
                person::getData();
                cout<<"Nhap vap diem trung binh cua sinh vien:\n";
                cin>>tbc;
           }
           void putData()
           {
                person::putData();
                cout<<"Diem TBC = "<<tbc<<"\n";
           }
           void isOutstanding()
           {
                if(tbc>=9.0)
                {
                cout<<"Day la hoc sinh xuat sac\n";
                }
           }
}
//////////////////////////
 
class teacher:public person
{
      private:
      int NumBook;
           void getData()
           {
                person::getData();
                cout<<"Nhap vao so sach da xuat ban cua giao vien:";
                cin>>NumBook;
           }
           void putData()
           {
                person::putData();
                cout<<"sach xuat ban"<<NumBook<<"\n";
           }
           void isOutstanding()
           {
                if(NumBook>=100)
                {
                         cout<<"Giao vien xuat sac\n";
                }
           }
//////////////////////////
 
int main()
{
    person* persPtr[100];
 
    int n=0;
    char choise;
    do
    {
         cout<<"Nhap vao ten mot nguoi or sinh vien or giao vien :"<<"p; s; g";
         cin>>choise;
         if(choise=='s')
         {
                        persPtr[n] = new student;
         }
         if(choise=='g')
         {
                       persPtr[n] = new teacher;
         }
         else
         {
                       persPtr[n] = new person;
         }
         persPtr[n++]->getData();
         cout<<"Co nhap nua hay khong(c/k):";
         cin>>choise;
    }
    while(choise=='c');
    for(int j=0;j<n;j++)
    {
            persPtr[j]->putData();
            persPtr[j]->isOutstanding();
    }
    return 0;
   // system("pause");
}
 
 

[Banfa]

1st: please do not reply to ancient threads. If you think they are relevant to your post put a link to them in your post.

2nd: If you are getting compiler errors you should post them.

However I was feeling generous so I compiled your code myself. You have a mistake at line 3 which should be

#include <string>

with a lowercase s (you are probably using windows which is case insensitive but I am using Linux which is case sensitive and String and string are not the same filename). Once I fixed that I got these compilation errors

/home/ben/Development/ConsoleTester/main.cpp|111|error: expected ‘}’ at end of input|
/home/ben/Development/ConsoleTester/main.cpp|111|error: expected unqualified-id at end of input|
 

which brings us onto

3rd When you get compilations errors, particularly if you are new to programming, deal with the first one first. "unqualified-id" is the second error, the first error is "expected ‘}’ at end of input".

"expected ‘}’" is very obvious because it says exactly what the problem is, you have a missing '}' somewhere.

A 10 second scan of your code shows that the problem is you have not closed the opening brace of the class teacher.

Also not that a class declaration is a statement and must be followed by a ;