Based on UML diagram, write a full program to implement the concept of aggregation classes. The program should produce an output as shown in Figure 1. MailMessage - Header header - Body bd Attachment atc + MailMessage() + string toString() MailMessage - filename : string Header Body - title : String + string getTitle () message : String + string getMessage () string getAttachment() Header: Programming Technique II Body: Lab Exercises for Aggregation Attachment: Labl1.cpp Figure 1: The program output

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OOPs

In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career. 

Constructor

The easiest way to think of a constructor in object-oriented programming (OOP) languages is: