/in/foo.cc: In function 'int main()':
/in/foo.cc:8:6: warning: unused variable 'x' [-Wunused-variable]
  int x,y,n,cc=0,ss=0,kk;
      ^
/in/foo.cc:8:8: warning: unused variable 'y' [-Wunused-variable]
  int x,y,n,cc=0,ss=0,kk;
        ^
/in/foo.cc:8:22: warning: unused variable 'kk' [-Wunused-variable]
  int x,y,n,cc=0,ss=0,kk;
                      ^~