View Compilation Error

0_0_22029509_1320.cpp: In function 'double cal(double)':
0_0_22029509_1320.cpp:16:2: error: 'ans' was not declared in this scope
  ans = 0;
  ^
0_0_22029509_1320.cpp: In function 'int main()':
0_0_22029509_1320.cpp:53:22: error: 'antr' was not declared in this scope
     if (dbcmp(antl - antr) >= 0) {
                      ^