rj.cpp: In function `int main()': rj.cpp:20: warning: `int xr' might be used uninitialized in this function rj.cpp:20: warning: `int yr' might be used uninitialized in this function rj.cpp:20: warning: `int xj' might be used uninitialized in this function rj.cpp:20: warning: `int yj' might be used uninitialized in this function /tmp/ccCsAAjh.o(.text+0x8d): In function `main': : the `gets' function is dangerous and should not be used.