explain why "this->dollars = dollars_part;     this->dollars += cents_part / 100;     this->cents = cents_part % 100;" is used

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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I am trying to understand a part of a code 

code

// To do: Implement class Money constructor
// (Hint: Use either : initializer form or assignment,
// EXTRA CREDIT to incorporate cents over 99)
Money::Money(int dollars_part, int cents_part)
{
    this->dollars = dollars_part;
    this->dollars += cents_part / 100;
    this->cents = cents_part % 100;
}

// Return true if the invoking object has less value than m
bool Money::isLessThan (const Money &m)
{
    if (this->dollars == m.dollars) {
        return this->cents < m.cents;
    }
    return this->dollars < m.dollars;
}

// Output the Money object
void Money::output()
{
cout << "$" << dollars << ".";
if (cents < 10) {
cout << "0";
}
cout << cents;
}

Can someone explain why "this->dollars = dollars_part;
    this->dollars += cents_part / 100;
    this->cents = cents_part % 100;" is used when its says "To do: Implement class Measurement constructor
// (Hint: Use either : initializer form or assignment,"?

Expert Solution
Step 1

A constructor is a special member function of a class, whose name is similar to the class name and calls automatically when the object of the class is created. Generally. a constructor is used to initializing the class data member by passing values through objects.
this pointer is a compiler-generated pointer. It is an implicit parameter to all member functions. It is used to refer to the invoking object. 

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