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- Question
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
- Correct Answer
- a class
- 1. 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
- 2. 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
- 3. 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 Discuss
- 4. 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
- 5. A function that changes the state of the cout object is called a(n) _____
Options- A. member
- B. adjuster
- C. manipulator
- D. operator Discuss
- 6. 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
- 7. 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
- 8. You define a structure type globally because _____
Options- A. you save many lines of code by not rewriting an identical structure definition in each function that uses it
- B. you will never change its definition
- C. it is required in C++
- D. All of the above Discuss
- 9. Paying attention to the important properties while ignoring inessential details is known as________
Options- A. selectiveness
- B. polymorphism
- C. abstraction
- D. summarizing Discuss
- 10. To use either an input or output file, the program must include the _____ header file
Options- A. filestream.h
- B. fstream.h
- C. instream.h
- D. inoutstream.h
- E. iostream.h Discuss
Object Oriented Programming Using C++ problems
Search Results
Correct Answer: class of the object using the function name
Correct Answer: inheritance
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.
Correct Answer: ios::in
Correct Answer: manipulator
Correct Answer: a null character
Correct Answer: optional
Correct Answer: you save many lines of code by not rewriting an identical structure definition in each function that uses it
Correct Answer: abstraction
Correct Answer: fstream.h
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