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- Question
The #ifndef directive tests to see whether ________
Options- A. a class has been defined
- B. a variable has been given a value
- C. a class has no variable definitions
- D. any objects of the class have been instantiated
- Correct Answer
- a class has been defined
Explanation#ifndef checks whether the given token has been #defined earlier in the file or in an included file; if not, it includes the code between it and the closing #else or, if no #else is present, #endif statement. #ifndef is often used to make header files idempotent by defining a token once the file has been included and checking that the token was not set at the top of that file.
Object Oriented Programming Using C++ problems
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- 1. The _____ mode tells C++ to open a file for input
Options- A. add::ios
- B. in::file
- C. ios::app
- D. ios::in
- E. ios::out Discuss
Correct Answer: ios::in
- 2. A function that changes the state of the cout object is called a(n) _____
Options- A. member
- B. adjuster
- C. manipulator
- D. operator Discuss
Correct Answer: manipulator
- 3. Using the wardrobe structure within the ShopList structure is an example of a good programming principle, known as _____
Options- A. reusability
- B. polymorphism
- C. redundancy
- D. recursion Discuss
Correct Answer: reusability
- 4. A default catch block catches
Options- A. all thrown objects
- B. no thrown objects
- C. any thrown object that has not been caught by an earlier catch block
- D. all thrown objects that have been caught by an earlier catch block Discuss
Correct Answer: any thrown object that has not been caught by an earlier catch block
- 5. Which of the following statements is false?
Options- A. A function is a block of code that performs a specific task
- B. Functions allow programmers to break large and complex problems into small and manageable tasks
- C. Functions allow programmers to use existing code to perform common tasks
- D. Functions can be called, or invoked, only once in a program
- E. Programmer-defined functions can be either value-returning or void Discuss
Correct Answer: Functions can be called, or invoked, only once in a program
- 6. To be called object-oriented, a programming language must allow
Options- A. functions that return only a single value
- B. #include files
- C. inheritance
- D. All of the above Discuss
Correct Answer: inheritance
- 7. When a child class function is called, the compiler looks first for a matching function name in the _____
Options- A. class of the object using the function name
- B. immediate ancestor class
- C. base class
- D. descendant class Discuss
Correct Answer: class of the object using the function name
- 8. A widget is to the blueprint for a widget as an object is to
Options- A. a member function
- B. a class
- C. an operator
- D. a data item Discuss
Correct Answer: a class
- 9. What does C++ append to the end of a string literal constant?
Options- A. a space
- B. a number sign (#)
- C. an asterisk (*)
- D. a null character Discuss
Correct Answer: a null character
- 10. The use of the break statement in a switch statement is
Options- A. optional
- B. compulsory
- C. not allowed. It gives an error message
- D. to check an error
- E. None of the above Discuss
Correct Answer: optional
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