6.2逻辑表达式

or.cpp

#include<iostream>
using namespace std;
int main()
{
cout<<"This program may reformat your hard disk\n"
           "and destroy all your data.\n"
           "Do you wish to continue?<y/n> ";
char ch;
cin>>ch;
if (ch=='y'||ch=='Y')
cout<<"You were warned!\a\a\n";
else if (ch=='n'||ch=='N')
cout<<"A wise choice ... bye\n";
else
cout<<"That wasn't a y or n! Apparently you "
           "can't follow\ninstructions，so"
　　　"I'll trash your disk anyway.\a\a\a\n";

system("pause");
return 0;
}