/in/foo.cc: In function 'int main()':
/in/foo.cc:6:16: warning: unused variable 'l' [-Wunused-variable]
  int i = 0, j, l, num;
                ^
/in/foo.cc:18:3: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (j != 3)
   ^