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();
}