#include<iostream>
using namespace std;
int main()
{ cout << "\aoperation \"hyperhype\" is now activated!\n";
cout << "enter your agent code:______\b\b\b\b\b";
long code;
cin >> code;
cout << "\ayou entered " << code << "...\n";
cout << "\acode verified! proceed with plan z2";
return 0;
}
将当前的输出位置退回前一列处，即消除前一个已输出的字符。
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