使用switch语句

#include<iostream>
using namespace std;
int main()
{
	int x;
	cin >> x;
	switch (x/10)
	{
	case 9:case 10:cout << "A"; break;
	case 8:cout << "B"; break;
	case 7:cout << "C"; break;
	case 6:cout << "D"; break;
	default:cout << "E"; break;
	}
	return 0;
}