#41420: _C++
用stack的LIFO概念實作
#include<iostream>
#include<stack>
int main(){
std::stack<int> binary;
int num;
while(std::cin>>num){
if(num==EOF) break;
while(num>0){
binary.push(num%2);
num=num/2;
}
while(!binary.empty()){
std::cout<<binary.top();
binary.pop();
}
std::cout<<std::endl;
}
return 0;
}