#include
int menu()
{
int ret = 0;
char cmd = getch();
ret = cmd;
switch (cmd)
{
case '1':
cout << "最大值" << endl;
break;
case '2':
cout << "最小值" << endl;
break;
case '3':
cout << "平均值" << endl;
break;
case '4':
cout << "返回" << endl;
break;
default:
cout << "Error" << endl;
ret = -1;
}
return ret;
}
void main()
{
int cmdNumber = -1;
while (cmdNumber < 0)
{
cmdNumber = menu();
}
cout << "Valid command : return number " << (char)cmdNumber << endl;
}