Why doesnt the main method work inside a class?

[Newb programmer]

I'm new to c++,so i quite don't understand why the main method doesn't work inside the class.Will be grateful to the person who understands my problem and gives a solution to it.

  // Example program
#include <iostream>
using namespace std;
class exc{
    
int main()
{
 
        string name;
        bool a=true;
        string ju="ad";
        cout << "What is your name? ";
        cin>>name;

         if(ju==name)
     {
         cout << "\nHello, " << name << "!\n";
     }
         else
     {  cout<<"not acceptable";
     }
 
    }
};

[mutexe]

main is the entry point into your program, it should not go in a class.
I suggest you work through the tutorials on this site.