What is namespace?

Question:What is namespace??

Answer: Namespaces allow us to group a set of global classes, objects and/or functions under a name. To say it somehow, they serve to split the global scope in sub-scopes known as <I>namespaces</I>.&nbsp; The form to use <I>namespaces</I> is:&nbsp; <TT><B>namespace </B><I>identifier</I></TT> <TT><B>{</B></TT> <TT>&nbsp;&nbsp;<I>namespace-body</I></TT> <TT><B>}</B></TT>Where <TT><I>identifier</I></TT> is any valid identifier and <TT><I>namespace-body</I></TT> is the set of classes, objects and functions that are included within the <I>namespace</I>. For example:&nbsp; <PRE>namespace general </PRE><PRE>{ </PRE><PRE>&nbsp;&nbsp;int a, b; </PRE><PRE>} </PRE>In this case, <TT><B>a</B></TT> and <TT><B>b</B></TT> are normal variables integrated within the <B>general</B> <I>namespace</I>. In order to access to these variables from outside the namespace we have to use the scope operator <TT><B>::</B></TT>. For example, to access the previous variables we would have to put:&nbsp; <TT>general::a</TT>&nbsp; <TT>general::b </TT>The functionality of <I>namespaces</I> is specially useful in case that there is a possibility that a global object or function can have the same name than another one, causing a redefinition error.

Tags:Interview Questions, Languages, C++,

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