Legal and Illegal Statements in Computer Programming
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Questions and Answers

What is the purpose of the private members hr and min in the clockType class?

  • To prevent direct access to the hour and minute values of the clock object. (correct)
  • To store the hour and minute values of the clock object in a static memory location.
  • To allow direct access to the hour and minute values of the clock object.
  • To provide default values for the hour and minute of the clock object.

    • Why are the statements myClock.hr = 10; and myClock.min = yourClock.min; considered illegal?

  • Because the `hr` and `min` members are declared as static in the `clockType` class.
  • Because the `hr` and `min` members are declared as private in the `clockType` class. (correct)
  • Because the `hr` and `min` members are declared as automatic in the `clockType` class.
  • Because the `hr` and `min` members are not declared as public in the `clockType` class.

    • What is the purpose of the clockType class in the given context?

  • To provide a set of functions for manipulating clock objects.
  • To provide a way to create static clock objects that can be shared across the program.
  • To provide a way to create automatic clock objects that are destroyed when they go out of scope.
  • To provide a data type for representing a clock object. (correct)

    • What is the purpose of the public and private access specifiers in the clockType class?

    <p>To control which members of the class can be accessed from outside the class.</p> Signup and view all the answers

    What is the difference between an automatic object and a static object in the context of the clockType class?

    <p>Automatic objects are created and destroyed dynamically, while static objects have a fixed lifetime.</p> Signup and view all the answers

    What is the purpose of using reference parameters when passing objects to functions?

    <p>All of the above</p> Signup and view all the answers

    What is the problem with passing objects by reference?

    <p>The actual parameter changes when the formal parameter changes</p> Signup and view all the answers

    How can you prevent the actual parameter from being modified when passing an object by reference?

    <p>Use the <code>const</code> keyword in the formal parameter declaration</p> Signup and view all the answers

    What is the main advantage of passing objects by reference instead of by value?

    <p>All of the above</p> Signup and view all the answers

    When should you use a constant function (a member function that cannot modify member variables)?

    <p>Both a and b</p> Signup and view all the answers

    What is the purpose of a constructor in a C++ class?

    <p>To guarantee that data members of the class are initialized</p> Signup and view all the answers

    What is the difference between a default constructor and a constructor with parameters?

    <p>All of the above</p> Signup and view all the answers

    How do you invoke a constructor with parameters?

    <p>By creating an object of the class and passing the required arguments</p> Signup and view all the answers

    What is the purpose of the const keyword in a function parameter declaration?

    <p>To prevent the function from modifying the parameter</p> Signup and view all the answers

    What is the main advantage of using accessor and mutator functions in a C++ class?

    <p>They provide a way to control access to the class's member variables</p> Signup and view all the answers

    What is the purpose of a constructor in a class?

    <p>To initialize the data members of an object when it is created</p> Signup and view all the answers

    What is the significance of a default constructor in a class?

    <p>It allows objects to be created without any parameters</p> Signup and view all the answers

    What is the purpose of a destructor in a class?

    <p>To deallocate memory for an object when it goes out of scope</p> Signup and view all the answers

    In the context of object-oriented programming, what is meant by 'pass by reference'?

    <p>Passing the address of an object to a function</p> Signup and view all the answers

    What is the difference between a class and an object in object-oriented programming?

    <p>A class is a blueprint, while an object is an instance of that class</p> Signup and view all the answers

    What is the purpose of the public, private, and protected keywords in a class?

    <p>They define the visibility and accessibility of class members</p> Signup and view all the answers

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