/in/foo.cc: In function 'int main()':
/in/foo.cc:4:2: error: 'cin' was not declared in this scope
  cin>>number;
  ^~~
/in/foo.cc:16:7: error: 'x1' was not declared in this scope
    if(x1!=xx)
       ^~
/in/foo.cc:20:10: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   if(xx=0)
          ^
/in/foo.cc:21:4: error: 'cout' was not declared in this scope
    cout<<x<<" ";
    ^~~~