c++中下列问题用switch语句怎么编写

#include
using namespace std;

int main()
{
int x;
int y;
cin >> x;
switch(x/1000)
{
case 0:
cout << " y = " << x << endl;
break;
case 1:
cout << " y = " << 0.9*x << endl;
break;
case 2:
cout << " y = " << 0.8*x << endl;
break;
case 3:
cout << " y = " << 0.7*x << endl;
break;
}
}

利用C语言整形数 除法的特性
switch(x/1000)
{
case 0:
//
break;
case 1:
//
break;
case 2:
//
break;
default:
//
break;
}