Try including the class declarations before the class menu. I didn't have time to test it, but it might work.
Why is there a main proto and you never made functions for adding ect so maybe that's why but it looks ok to me oh and hemeans put the main class under the others and remove the main call on line 35
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Put the lines 42-69 (the declaration of Addition, Subtraction etc.) before the declaration of class Menu.
And just never call main();