2051 Bitset

#include<iostream>using namespace std;int main(void){    int n;    string str;    while(cin>>n)    {        str="";        while(n)        {            str+=(n%2+'0');            n/=2;        }        for(int i=str.length()-1;i>=0;i--)        {            cout<<str[i];        }        cout<<endl;    }    return 0;}