This declaration has no storage class or type specifier in C++ -

i have multiple classes in program .

a) when create object of class in class getting no error when use object call function above error .

b)also if create object of class , call function using in constructor of class no error .

c) cout function not work in body of class except when put function

d) main class able of these , not getting error .

it great hear . thank in advance .

following code : these 2 classes in cpp. facing no problems except using object after creating . code huge posted . can done in main not in other classes why ?

 #include <iostream>  #include <fstream>  #include <iomanip>  #include <string>  #include <cstdlib>   #include <vector>  #include <map>  using namespace std;  class message   {      public:     void check(string side)        {     if(side!="b"&&side!="s")           {     cout<<"side should either buy (b) or sell (s)"<<endl;;           }        }   };      class orderbook   {     public:       string side;       orderbook()  //no error if define inside constructor       message m;       //no error while declaring       m.check(side);   //error when write m. or m->   }; 

this mistake:

m.check(side); 

that code has go inside function. class definition can contain declarations , functions.

classes don't "run", provide blueprint how make object.

the line message m; means orderbook contain message called m, if later create orderbook.