【c++】对象

对象的内部可以有变量和函数，而结构通常只由各种变量组成

对象使用变量存储信息，调用函数完成操作

如何声明一个类

class MyFirstClass

{

};

一个实例

#include<iostream>#define FULL_GAS 80class Car{public:    std::string color;    std::string engine;    float gas_tank;    unsigned int wheel;    void setColor(std::string col);    void setEngine(std::string eng);    void setWheel(unsigned int whe);    void fill_tank(int liter);//加油    int running(void);    void warning(void);};void Car::setColor(std::string col){    color = col;}void Car::setEngine(std::string eng){    engine = eng;}void Car::setWheel(unsigned int whe){    wheel = whe;}void Car::fill_tank(int liter)//浣滅敤鍩熻В鏋愮锛屽憡璇夌紪璇戝櫒杩欎釜鏂规硶鏈鍝竴涓被{    gas_tank += liter;}int Car::running(void){    std::cout<<"我正在以120的速度移动"<<"\n";    gas_tank--;    std::cout << "当前还剩" <<100*gas_tank/FULL_GAS<<"%"<<"油量!!!\n";    return gas_tank;}void Car::warning(void){    std::cout << "WARNING!! 还剩"<<100*gas_tank/FULL_GAS<<"%油量\n";}int main(){    char i;    Car mycar,car1;    mycar.setColor("white");    mycar.setEngine("V8");    mycar.setWheel(4);    mycar.gas_tank=FULL_GAS;    while( mycar.running() )    {        if(mycar.running()<10)        {            mycar.warning();            std::cout<<"是否需要加油？【Y/N】";            std::cin>>i;            if('Y'==i||'y'==i)            {                mycar.fill_tank(FULL_GAS);            }        }    }    return 0;}