View Compilation Error

0_0_21727494_1680.cpp: In function 'double dis(int, int)':
0_0_21727494_1680.cpp:33:15: error: request for member 'x' in 'a', which is of non-class type 'int'
  double x = a.x - b.x;
               ^
0_0_21727494_1680.cpp:33:21: error: request for member 'x' in 'b', which is of non-class type 'int'
  double x = a.x - b.x;
                     ^
0_0_21727494_1680.cpp:34:15: error: request for member 'y' in 'a', which is of non-class type 'int'
  double y = a.y - b.y;
               ^
0_0_21727494_1680.cpp:34:21: error: request for member 'y' in 'b', which is of non-class type 'int'
  double y = a.y - b.y;
                     ^