how to import classes in one class

[maabar]

Hi,
can anybody tell me the codes to import more than one class, i.e. (.cpp) file, into another class?

For example, if I have the following classes:
"class1.cpp "
"class2.cpp "

and I want to declare objects of these classes in my main class: "MainClass. cpp"

Do I need to declare header files for class1 and class2?

Also, what would be the compiling commands to compile "Mainclass.cpp" ?

Thanks

[Banfa]

Yes include the header files for all the classes you wish to declare in your main class.

And it rather depends on which compiler you are using.

[maabar]

I am using g++ and I am using the following compiling commands:

g++ -Wall -Lpath MainClass MainClass.cpp -o

where path is the location of the directory that has my files.

I am getting the following error messages:

"In 'main': undefined reference to 'Class1::somefu nctions()':coll ect2:ld returened 1 exit status"

Any suggestions?