/in/foo.cc: In function 'int main(int, char**)':
/in/foo.cc:22:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,x,y;
        ^
/in/foo.cc:22:10: warning: unused variable 'x' [-Wunused-variable]
  int i,j,x,y;
          ^
/in/foo.cc:22:12: warning: unused variable 'y' [-Wunused-variable]
  int i,j,x,y;
            ^