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What is the use of Namespace?

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What is the use of Namespace?

(a) To encapsulate the data

(b) To structure a program into logical units

(c) Encapsulate the data & structure a program into logical units

(d) It is used to mark the beginning of the program

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I'd like to ask this question from Namespaces topic in section Functions, Namespaces & Exceptions in C++ of C++

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Correct option is (b) To structure a program into logical units

Best explanation: The main aim of the namespace is to understand the logical units of the program and to make the program so robust.

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