/in/foo.cc: In function 'int main()':
/in/foo.cc:8:16: warning: unused variable 'k' [-Wunused-variable]
  int i = 0, l, k = 0, p = 0;
                ^
/in/foo.cc:8:23: warning: unused variable 'p' [-Wunused-variable]
  int i = 0, l, k = 0, p = 0;
                       ^