【C++】类的私有成员遍历和公有成员变量

定义类：

#include <string>
#include <iostream>

using namespace std;

//构造函数  定义对象的时候运行
//析构函数  定义的对象释放的时候运行
class girl
{
public:
    girl();
    girl(double h, double w, int a, double s);
    ~girl();

private:
    double weight;
    int age;
    bool gz;

public:
    int tellAge();
    double tellWeight();
    double height;
    double salary;
};

girl::girl()
{
    girl::height = 0.0;
    girl::weight = 0.0;
    girl::age = 0;
    girl::salary = 0.0;
    cout << "构造girl" << endl;
    gz = false;
}

girl::girl(double h, double w, int a, double s)
{
    girl::height = h;
    girl::weight = w;
    girl::age = a;
    girl::salary = s;
    cout << "setAll2" << endl;
    gz = true;
}


girl::~girl()
{
    cout << "析构girl" << endl;
}


int girl::tellAge()
{
    if (gz)
    {
        return age;
    }
    else
    {
        cout << "没有初始值" << endl;
        return 0;
    }

}

double girl::tellWeight()
{
    if (gz)
    {
        return weight;
    }
    else
    {
        cout << "没有初始值" << endl;
        return 0.;
    }
}

类的使用

void main()
{
    //girl Hua;
    girl Hua(180.0, 70.0, 20, 5000.0);
    girl Fua(170.0, 80.0, 25, 3000.0);

    //私有的成员不能直接访问，私有的类成员变量只能在类中访问
    double ageTemp = Hua.tellAge();
    cout << "Hua age is " << ageTemp << endl;
    double weightTemp = Hua.tellWeight();
    cout << "Hua weight is " << weightTemp << endl;

    //公有的成员可以直接访问
    cout << "Hua height is " << Hua.height << endl;
    cout << "Hua salary is " << Hua.salary << endl;

    cout << "Fua height is " << Fua.height << endl;
    cout << "Fua salary is " << Fua.salary << endl;

    cin.get();
}

类指针的使用

void main()
{
    girl* Hua = NULL;
    Hua = new girl(180.0, 70.0, 20, 5000.0);

    //私有的成员不能直接访问，私有的类成员变量只能在类中访问
    double ageTemp = Hua->tellAge();
    cout << "Hua age is " << ageTemp << endl;
    double weightTemp = Hua->tellWeight();
    cout << "Hua weight is " << weightTemp << endl;

    //公有的成员可以直接访问
    cout << "Hua height is " << Hua->height << endl;
    cout << "Hua salary is " << Hua->salary << endl;

    delete Hua;
    Hua = NULL;

    cin.get();
}