All identifiers in C++ must be unique and, if this rule is not observed in naming you end up with what is called 'naming resolution. The C++ compiler faces an ambiguous situation and, will throw up an error message.
Providing namespace is to help the compiler know that the identifier must be associated with a namespace. This is in much the same was as saying someone lives in Washington (Which one the State or D.C?). It is not a problem with small programs and it becomes a problem for larger programs.
In addition to identifier scope (local, global), namespace provides yet another option to reduce the name conflict in programs.
Providing namespace is to help the compiler know that the identifier must be associated with a namespace. This is in much the same was as saying someone lives in Washington (Which one the State or D.C?). It is not a problem with small programs and it becomes a problem for larger programs.
In addition to identifier scope (local, global), namespace provides yet another option to reduce the name conflict in programs.
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