/in/foo.cc: In function 'int main()':
/in/foo.cc:5:6: warning: unused variable 'n' [-Wunused-variable]
  int n=0;
      ^
/in/foo.cc:7:10: warning: 'k' is used uninitialized in this function [-Wuninitialized]
  cout<<k+1;
          ^