View Compilation Error

0_0_35399117_10960.cpp: In function 'int main()':
0_0_35399117_10960.cpp:36:15: error: 'AD' was not declared in this scope
   double Cx = AD;
               ^
0_0_35399117_10960.cpp:41:20: error: 'By' was not declared in this scope
   double Cy = cala(By,BC,du);
                    ^