Declaration, definition, assignment, and initialization

Declaration: can appear more than once, just tell the compiler that there is such an object, the object is created somewhere else.

Definition: Only occurs once, creates an object, and assigns him a piece of memory space.

Assignment: Put the value into this storage space, when assigned, the assignment number to the left is called the left value, represents a piece of storage space.

Initialize: Can be redefined at the same time, put the value into the storage space.

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Declaration, definition, assignment, and initialization