rj.cpp: In function `int main()': rj.cpp:59: warning: comparison between signed and unsigned integer expressions rj.cpp:52: warning: `int rx' might be used uninitialized in this function rj.cpp:52: warning: `int ry' might be used uninitialized in this function rj.cpp:52: warning: `int jx' might be used uninitialized in this function rj.cpp:52: warning: `int jy' might be used uninitialized in this function