View Compilation Error

0_0_26502618_20470.cpp: In function 'int main()':
0_0_26502618_20470.cpp:27:18: error: 'eps' was not declared in this scope
    cos+=ty-ll(py+eps);//hua fei
                  ^
0_0_26502618_20470.cpp:47:23: error: 'eps' was not declared in this scope
         cos+=(b-ll(py+eps));
                       ^