C++构造函数简单实现电梯控制程序

对于电梯，属性之一就是位置，所以要实现这一程序，要设置电梯的初始位置和按下电梯按钮改变的电梯的位置。

代码如下：

#include <iostream>
#include <cstdlib>
#include <windows.h>
using namespace std;
class Elevator
{
private:
	int currentFloor;     //电梯所处位置
public:
	Elevator(int cfloor=1);      //构造函数
	void request(int newfloor);
};

Elevator::Elevator(int cfloor)
{
	currentFloor=cfloor;
}
void Elevator::request(int newfloor)
{
	if(newfloor==currentFloor)
	{
		cout<<"You have on the floor!!!"<<endl;
		return;
	}
	else if(newfloor>currentFloor)   //电梯向上移动
	{
		cout<<endl<<"Starting at floor......"<<currentFloor<<endl;
		while(newfloor>currentFloor)
		{
			currentFloor++;
			Sleep(2000);
			cout<<"Going up-now at floor.."<<currentFloor<<endl;
		}
		cout<<"Stopping at floor......"<<currentFloor<<endl;
	}
	else       //电梯向下移动
	{
		cout<<endl<<"Starting at floor........"<<currentFloor<<endl;
		while(newfloor<currentFloor)
		{
			currentFloor--;
			Sleep(2000);
			cout<<"Going down-now at floor.."<<currentFloor<<endl;
		}
		cout<<"Stopping at floor........"<<currentFloor<<endl;
	}
}

int main()
{
	char answer='y';
	int aimfloor=0;     //目标层数
	Elevator a;
	while(answer!='n')
	{
		cout<<"please input your floor(1--15):";
		cin>>aimfloor;
		if(aimfloor<1||aimfloor>15)
		{
			cout<<"*****Floor is wrong!!!*****"<<endl;
		}
		else
		{
			a.request(aimfloor);
		}
		cout<<endl<<"You go on?(y or n):";
		cin>>answer;
	}
	cout<<"Thank you for using!!!"<<endl;
	system("pause");
	return 0;
}

以上main()函数中生成Elevator类的一个对象a,并没有明确指定电梯初始位置，因此在构造函数形参中设置默认参数值1，将电梯初始位置初始化为第1层，即currentFloor==cfloor==1.