模拟电梯系统 C++

// 模拟电梯系统2.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "iostream"
#include "Windows.h"
using namespace std;

class elevator
{
public:
elevator();
void up();
void down();
void shutdown();
private:
int num;
};


elevator::elevator()
{
num = 1;
}
void elevator::up()
{
static int a;
a = num;
a++;
if(a<=10)
{
system("cls");
cout << a << endl;
cout.put(7);
}
else if(a>10)
{
system("cls");
cout << "Error" << endl;
}
num = a;
}

void elevator::down()
{
static int b;
b = num;
b--;
if(b>=1)
{
system("cls");
cout << b << endl;
cout.put(7);
}
else if(b<1)
{
system("cls");
cout << "Error" << endl;
}
num = b;
}

void elevator::shutdown()
{
static int c;
c = num;
if(c>1)
{
for( ;c>=1;c--)
{
cout << c << endl;
Sleep(500);
system("cls");
}
c++;
cout << c << endl;
cout.put(7);
}
num = c;
}

void main()
{
elevator a;
char b;
while(1)
{
cin >> b;
system("cls");
switch(b)
{
case '+':a.up();break;
case '-': a.down();break;
case 'S':a.shutdown();break;
default:cout << "Error" << endl;
}
}
}