Defining Class Members, C++ (gcc)

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//g++  5.4.0

#include <iostream>
#include <string>

//=========================================
// Person Class
//=========================================
class Person
{
    public:
    Person() {}
    Person(std::string name) {_name = name;}
    Person(std::string name, int age, int height, int weight);
    
    //=======Start get and set functions=======
    std::string getName() const { return this->_name; }
    void setName(std::string name) { _name = name; }
    
    int getHeight() const { return this->_heightInInches; }
    void setHeight(int height) { _heightInInches = height; }
    
    int getWeight() const { return this->_weightInPounds; }
    void setWeight(int weight) { _weightInPounds = weight; }
    
    int getAge() const { return this->_age; }
    void setAge(int age) { _age = age; }
    //=======End get and set functions=======
    
    // Behavioral functions
    void sayHello() const;
    
    private:
    
    std::string _name;
    int _age;
    int _heightInInches;
    int _weightInPounds;
    
};

Person::Person(std::string name, int age, int height, int weight)
{
    
}

void Person::sayHello() const
{
    std::cout << this->_name << " says hello!" << std::endl;
}

//=========================================
// Main Program
//=========================================
int main()
{
    std::cout << "Creating Person object..." << std::endl;
    
    Person p("John");
    std::cout << "\nPerson has been created. Their name is " << p.getName()
        << "." << std::endl;
    
    p.sayHello();
    
    std::cout << "\n" << p.getName() << " has decided to change his name. It will now be Andrew." << std::endl;
    p.setName("Andrew");
    
    p.sayHello();
}

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Compilation time: 0.54 sec, absolute service time: 0,6 sec