C++ hdoj 2051Bitset

#include<iostream>using namespace std;int main(){  int i,j,n,a[100]; while(cin>>n) {  i=0;              while(n)  {   a[i]=n%2;   n=n/2;   i++;  }  for(j=i-1;j>=0;j--)  {   cout<<a[j];  }  cout<<endl; } return 0;}