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#include <iostream>
using namespace std;
 
class Line;
 
class Shape 
{
public:
    Line GetTangent()
    {
    	return new Line();
    }
};
 
class Line : Shape
{
 
};
 
int main() {
 
	Shape s;
	Line line = s.GetTangent();
 
	// your code goes here
	return 0;
}

prog.cpp: In member function ‘Line Shape::GetTangent()’:
prog.cpp:10:5: error: return type ‘class Line’ is incomplete
     {
     ^
prog.cpp:11:22: error: invalid use of incomplete type ‘class Line’
      return new Line();
                      ^
prog.cpp:4:7: error: forward declaration of ‘class Line’
 class Line;
       ^
prog.cpp: In function ‘int main()’:
prog.cpp:23:27: error: conversion from ‘void’ to non-scalar type ‘Line’ requested
  Line line = s.GetTangent();
                           ^

Standard output is empty