View Compilation Error

0_0_37583420_20736.cpp: In function 'int main()':
0_0_37583420_20736.cpp:38:21: error: 'da_pos' was not declared in this scope
                 if (da_pos!=-1)
                     ^
0_0_37583420_20736.cpp:41:26: error: 'da_num' was not declared in this scope
                     ans-=da_num;
                          ^