text: #include <iostream>
  #include "A.h"
  #include "B.h"
  #include "C.h"
  
  using namespace std;
  
  int main(){
  
      ClassA msg_a;
      msg_a = ClassA();
  
      ClassB msg_b;
      msg_b = ClassB();
  
      ClassC msg_c;
      msg_c = ClassC();
  
      cout<<msg_a.getA()<<endl;
      cout<<msg_b.getB()<<endl;
      cout<<msg_c.getC()<<endl;
  
      return 0;
  }
  