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Looks like there are a few problems here:

• The Point class is in the geometry_msgs namespace, so you should use the fully-namespaced class type: geometry_msgs::Point
• ROS message types (such as point) only have default constructors, so you have to construct the object before you can fill in its fields.
• You cannot have code outside of a function or class in C++ (as in your second try)

P.S. - for future questions please use the "preformatted text" button and paste your code and error messages directly into the question.