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#include <iostream>
#include <string>
 
using std::string;
 
class Dog
{
  protected:
      string m_name, m_breed, m_color;
      int m_age; 
  public:
      Dog() : m_name("Fido"), m_breed("Corgi"), m_color("Black"), m_age(1) {}
      Dog(const Dog& d) { m_name = d.getName(); m_age = d.getAge(); }
      string getName() { return m_name; }
      int getAge() { return m_age; }
};
 
int main()
{
}
 

prog.cpp: In copy constructor 'Dog::Dog(const Dog&)':
prog.cpp:13:46: error: passing 'const Dog' as 'this' argument of 'std::string Dog::getName()' discards qualifiers [-fpermissive]
       Dog(const Dog& d) { m_name = d.getName(); m_age = d.getAge(); }
                                              ^
prog.cpp:13:66: error: passing 'const Dog' as 'this' argument of 'int Dog::getAge()' discards qualifiers [-fpermissive]
       Dog(const Dog& d) { m_name = d.getName(); m_age = d.getAge(); }
                                                                  ^

Standard output is empty