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View Compilation Error

0_0_16987937_9936.cpp:1:2: error: expected unqualified-id before numeric constant
  1 struct Vector3{    //方向向量 
  ^
0_0_16987937_9936.cpp:4:2: error: expected unqualified-id before numeric constant
  4 double xmulti3(Vector3 v1,Vector3 v2)    //三维向量的叉积 
  ^


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