View Compilation Error

0_0_23566397_9227.cpp: In function 'int main()':
0_0_23566397_9227.cpp:61:10: error: 'lx' was not declared in this scope
   memset(lx,0,sizeof(lx)));
          ^
0_0_23566397_9227.cpp:62:10: error: 'rx' was not declared in this scope
   memset(rx,0,sizeof(rx));
          ^