IT1050 Object Orientation Lecture 05
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Questions and Answers

What is the purpose of the private section in a class definition?

  • To define default values for the class members
  • To provide a summary of the class methods
  • To allow access to members from anywhere in the program
  • To restrict access to members from outside the class (correct)
  • Which of the following correctly describes how methods defined in a class can be accessed?

  • They are accessible only through the public interface of the class (correct)
  • They are accessible exclusively from within other class methods
  • They can only be accessed directly from the class without instantiation
  • They can be accessed by any part of the program without restrictions
  • In the Rectangle class implementation, what is the return type of the calcArea method?

  • int (correct)
  • double
  • float
  • void
  • What is the correct way to set the width of a Rectangle object in C++?

    <p>object.setWidth(5);</p> Signup and view all the answers

    How should setLength modify the length attribute in the Rectangle class?

    <p>It should modify the member variable using the passed parameter</p> Signup and view all the answers

    What happens if you attempt to access a private member directly from outside the class?

    <p>It causes a compile-time error</p> Signup and view all the answers

    If you want to calculate the area of a rectangle, which method must be called after setting the dimensions?

    <p>calcArea()</p> Signup and view all the answers

    What is the expected output if width is set to 10 and length is set to 5 in the Rectangle class?

    <p>50</p> Signup and view all the answers

    What is the purpose of the setStudentNo function in the Student class?

    <p>To set the student number</p> Signup and view all the answers

    What is the correct implementation of the assignMarks function based on the provided information?

    <p>void Student::assignMarks(int n1, int n2, int n3) { marks1 = n1; marks2 = n2; marks3 = n3; }</p> Signup and view all the answers

    What is the return type of the calcAvg function in the Student class?

    <p>float</p> Signup and view all the answers

    In the main function, how is the width of rec1 set using the provided code?

    <p>rec1.setWidth(10);</p> Signup and view all the answers

    What is the meaning of the following line in the given code: 'float average = (marks1+marks2+marks3)/3.0;'?

    <p>This line calculates the average of three mark variables.</p> Signup and view all the answers

    How are objects of a class created according to the information provided?

    <p>Using the class name followed by the object name;</p> Signup and view all the answers

    Which of the following statements regarding access specifiers in the Student class is correct?

    <p>Public methods can be accessed from outside the class.</p> Signup and view all the answers

    Which of the following is a valid way to create multiple objects of the Rectangle class?

    <p>Rectangle rec1; Rectangle rec2;</p> Signup and view all the answers

    What is the primary purpose of the private section in a class definition?

    <p>To define properties (data members) that are accessible only within the class</p> Signup and view all the answers

    Which of the following methods is NOT typically included in a class definition for managing attributes?

    <p>initAttributes()</p> Signup and view all the answers

    Which term best describes the foundational steps of Object-Oriented Programming (OOP) mentioned?

    <p>Problem analysis followed by class and object creation</p> Signup and view all the answers

    How are private and public members defined in a C++ class?

    <p>Private members cannot be accessed outside the class, whereas public can be</p> Signup and view all the answers

    In the context of the Rectangle class example, which of these data types is suitable for the attributes width and length?

    <p>int</p> Signup and view all the answers

    Which statement accurately reflects OO analysis and design?

    <p>It encompasses conceptualizing and designing classes before implementation</p> Signup and view all the answers

    What would be a valid implementation to calculate the area of a rectangle in the provided class?

    <p>int calcArea() { return length * width; }</p> Signup and view all the answers

    Which step comes after identifying the objects in the Object-Oriented Programming process?

    <p>Developing classes</p> Signup and view all the answers

    Study Notes

    Learning Outcomes

    • Students will learn to implement a class and create objects using C++.

    Object-Oriented Programming Steps

    • Analyze problems and identify objects as part of object-oriented (OO) analysis.
    • Develop classes and create objects in OO programming.
    • Build the solution by encapsulating functionality.

    Example: Rectangle Class

    • Class representation of a rectangle includes private data members: width and length.
    • Public methods defined for the Rectangle class:
      • setWidth()
      • setLength()
      • calcArea() for calculating the area.

    Rectangle Class in C++

    • C++ class structure:
      • Private section holds data members (int width, int length).
      • Public section defines methods to manipulate the rectangle's properties.

    Access Control: Private & Public

    • Private properties are hidden and cannot be accessed outside the class directly.
    • Public methods act as interfaces to access and modify private data members.

    Implementing Methods

    • Example implementation in C++:
      • setWidth(int no) method assigns a value to the width.
      • setLength(int no) method assigns a value to the length.
      • calcArea() computes and returns the area of the rectangle.

    Student Class Example

    • Class representation for a student includes:
      • Private data members: studentNo, marks1, marks2, marks3.
      • Public methods:
        • setStudentNo()
        • assignMarks()
        • calcAvg() for calculating the average of the marks.

    Student Class in C++

    • Structure of the Student class in C++ mirrors the Rectangle class layout for consistency.

    Creating Objects

    • Syntax for creating objects: Class_name Object_name;
      • Declare a single object: Rectangle rect1;
      • Declare multiple objects: Rectangle rect1, rect2;
      • Declare an array of objects: Rectangle rectangles;

    Accessing Public Methods

    • Include libraries and use main() to create and manipulate objects.
    • Example of setting properties and accessing public methods using standard output (cout).

    Summary

    • Understanding of encapsulation, object manipulation, and class implementation in C++ is fundamental in object-oriented programming.

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    Description

    This quiz covers the key concepts of classes and objects in C++ as part of the IT1050 Object Oriented Concepts course. Students will learn to implement a class and create objects using the principles of object-oriented programming. Enhance your understanding of C++ and deepen your programming skills with this focused assessment.

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