Namespaces ; expected unqualified id before ')' token ; invalid use of struct?

This has nothing to do with namespace In C/C++ the rule for declaring a function is: returnType functionName(functionArgument1,functionArgument2,...) Your way of declaring the function does not follow the C/C++ rule. What you have is: void class hello() It should be: void hello() Probably you are confusing it with syntax to define the function outside the class body. In that case the rule is: returnType className::functionName(functionArgument1, functionArgument2,...) { } Namespace does not affect how function is declared.It defines where the function is available.

This has nothing to do with namespace. In C/C++ the rule for declaring a function is: returnType functionName(functionArgument1,functionArgument2,...); Your way of declaring the function does not follow the C/C++ rule. What you have is: void class hello(); It should be: void hello(); Probably you are confusing it with syntax to define the function outside the class body.In that case the rule is: returnType className::functionName(functionArgument1, functionArgument2,...) { } Namespace does not affect how function is declared.

It defines where the function is available.

You are not trying to write a class there. A class is different than a function. Please try: void hello().

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