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Feb 27th, 2020
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  1. #include <iostream>
  2. #include <string>
  3.  
  4. using namespace std;
  5.  
  6. class A{
  7. double b;
  8.  
  9. public:
  10. A(double arg) : b(arg){};
  11. virtual double virt_method(double a, double b)=0;
  12.  
  13.  
  14. };
  15.  
  16.  
  17. class B: public A{
  18. double virt_method(double a, double b){
  19. return (a+b);
  20. }
  21. B(double a):A(0){};
  22.  
  23.  
  24.  
  25.  
  26. };
  27.  
  28. int main()
  29. {
  30.  
  31. }
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