This declaration has no storage class or type specifier in C

Question

I have multiple classes in my program  A  When I create an object of a class in another class I am getting no error but when I use the object to call a function I get the above error  B Also if I create an object of another class and call a function using that  in the constructor of my class then I get no error like this  C  Cout function does not work in the body of the class except when I put it any function D  The main class is able to do all of these and I am not getting any error  It would be great to hear back soon  Thank you in advance  Following is the code   These are two classes in my cpp  I am facing no problems except using object after creating it  the code is too huge too be posted  Everything can be done in main but not in other classes why    include  lt iostream gt    include  lt fstream gt    include  lt iomanip gt    include  lt string gt    include  lt cstdlib gt     include  lt vector gt    include  lt map gt   using namespace std   class Message        public      void check string side              if side   quot B quot  amp  amp side   quot S quot                       cout lt  lt  quot Side should be either Buy  B  or Sell  S  quot  lt  lt endl                       class Orderbook       public        string side        Orderbook          No Error if I define inside constructor       Message m          No Error while declaring       m check side       Error when I write m  or m- gt

User · Answer

Calling m check side   meaning you are running actual code  but you can t run code outside main   - you can only define variables  In C    code can only appear inside function bodies or in variable initializes

User · Answer

This is a mistake   m check side     That code has to go inside a function  Your class definition can only contain declarations and functions   Classes don t  run   they provide a blueprint for how to make an object    The line Message m  means that  an Orderbook will contain Message called m  if you later create an Orderbook

User · Answer

You can declare an object of a class in another Class that s possible but you cant initialize that object  For that  you need to do something like this  --   inside main   Orderbook o1  o1 m check side    but that would be unnecessary  Keeping things short  -   You can t call functions inside a Class

[c++] This declaration has no storage class or type specifier in C++

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