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#include <cstdlib>
 
struct Shape {}; 
struct Rect : public Shape {}; 
struct Elipse : public Shape {}; 
 
Shape* randomShape() { return (std::rand() % 2) ? new Rect() : new Elipse(); }

prog.cpp: In function ‘Shape* randomShape()’:
prog.cpp:7:75: error: conditional expression between distinct pointer types ‘Rect*’ and ‘Elipse*’ lacks a cast
 Shape* randomShape() { return (std::rand() % 2) ? new Rect() : new Elipse(); }
                                                                           ^
prog.cpp:7:78: warning: control reaches end of non-void function [-Wreturn-type]
 Shape* randomShape() { return (std::rand() % 2) ? new Rect() : new Elipse(); }
                                                                              ^

Standard output is empty