对象 1 作用域解析符 ：：

1 对象举例
#include <iostream>

using namespace std;

class Car {

public:

    string color;

    string engine;

    float gas_tank;

    unsigned int wheel;



    void running(void);

};



void Car::running(void){    //作用域解析符，方法属于哪个类

    cout << "run run run" << endl;

}



int main() {

    Car car;

    car.running();

    return 0;

}

/* vim: set ts=4 sw=4 sts=4 tw=100 */

 

注意事项： 1 类的声明 。h 文件中    类的函数的定义放入 cpp 中



2 c++允许在类里面声明常量，但不允许对它进行赋值。 class Car

{

public:

     const float TANKSIZE = 85;  //出错
     static const float TANKSIZE = 85; //ok


} 

3 a = b 是完全复制 

#include <iostream>

using namespace std;

class Car {

public:

    string color;

};





int main() {



    Car car1, car2;

    car1.color = "red";



    car2 = car1;



    cout << "car1.color = red" << endl;



    cout << "car2 = car1 , car2 color " << car2.color << endl;



    car2.color = "blue";



    cout << "change car2 , look car1 " << car1.color << endl;



    return 0;

}

/* vim: set ts=4 sw=4 sts=4 tw=100 */