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You can incorporate multiple input operators into one input statement for
the same reason that you can include multiple output operators into one output
statement: In C++, each input expression refers to the same chunk of
memory that is referred to by that input expression's left-side operand.
Accordingly, the input expression cin >> height refers to a chunk of
memory that specifies an input place, and that chunk of memory is the same
chunk of memory that is named by cin:
*--------------------------*
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------*------ |
cin >> height |
-*- |
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*-----------------------------* |
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v v
*-----*-----*-----*-----*--
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*-----*-----*-----*-----*---