View Compilation Error

0_0_16987938_11673.cpp:1:4: error: stray '#' in program
  1 #include <iostream>
    ^
0_0_16987938_11673.cpp:2:4: error: stray '#' in program
  2 #include <cmath>
    ^
0_0_16987938_11673.cpp:1:2: error: expected unqualified-id before numeric constant
  1 #include <iostream>
  ^
0_0_16987938_11673.cpp:4:2: error: expected unqualified-id before numeric constant
  4 struct Vector3{    //方向向量 
  ^
0_0_16987938_11673.cpp:7:2: error: expected unqualified-id before numeric constant
  7 double xmulti3(Vector3 v1,Vector3 v2)    //三维向量的叉积 
  ^
0_0_16987938_11673.cpp:20:1: error: expected unqualified-id before numeric constant
 20 int main()
 ^