/in/foo.cc: In function 'int main()':
/in/foo.cc:17:6: warning: unused variable 'k1' [-Wunused-variable]
  int k1=0,k2=0;
      ^~
/in/foo.cc:17:11: warning: unused variable 'k2' [-Wunused-variable]
  int k1=0,k2=0;
           ^~