填空题：（8分）Like a pointer, a reference is an alias for an object, is us

（8分）Like a pointer, a reference is an alias for an object, is usually implemented to hold a machine of an object, and does not impose performance overhead compared to pointers, but it differs from a pointer in that:

• You access a reference with exactly the syntax as the name of an object.

• A reference always refers to the object to which it was .

• There is no "null reference," and we may assume that a reference to an object.





答案：
第1空：address ||

第2空：same ||

第3空：initialized ||

第4空：refers ||