1 #include<iostream> 2 #include<vector> 3 using namespace std; 4 int fun(int i) 5 { 6     if(i==1){ 7     return 0; 8     } 9       if (i&&!(i&(i-1)))10             return 1;11 12       else13             return 0;14 }15 16 int main()17 {18       vector<int> vel;19       int x;20       bool A;21       while(cin>>x)22       {23             A=fun(x);24             vel.push_back(A);25       }26       vector<int>::iterator it;27       for(it=vel.begin();it!=vel.end();it++)28       {29             if(*it==1)30             {31                 cout<<"true"<<endl;32             }33             else{34             cout<<"false"<<endl;35             }36       }37       return 0;38 }