#include using namespace std; int main(){ int a, b, c; cout <<"輸入a b c : "; bool found=false; scanf("%d %d %d", &a, &b, &c); if (a>0)a=1; else a=0; if(b>0)b=1; else b=0; if((a&b)==c){ cout<<"AND"<<endl; found=true; } if((a|b)==c){ cout<<"OR"<<endl; found=true; } if((a^b)==c){ cout<<"XOR"<<endl; found=true; } if(!found)cout<<"IMPOSSIBLE"<<endl; }