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Home ‣ Computer Science ‣ Object Oriented Programming Using C++ See What Others Are Saying!
- 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.
More questions
- 1. A workstation has just been installed on an Ethernet LAN, but cannot communicate with the network. What should you check first?
Options- A. reinstall the network protocols
- B. reinstall the network interface card driver
- C. verify the ip configuration on the workstation
- D. verify the link status on the computer's network card
- E. None of the above Discuss
Correct Answer: verify the link status on the computer's network card
- 2. Carrier is
Options- A. One or more conductors that serve as a common connection for a related group of devices
- B. a continuous frequency capable of being modulated or impressed with a second signal
- C. the condition when two or more sections attempt to use the same channel at the same time
- D. a collection of interconnected functional units that provides a data communications service among stations attached to the network
- E. None of the above Discuss
Correct Answer: a continuous frequency capable of being modulated or impressed with a second signal
- 3. Fixed asset file management procedures are not required for
Options- A. carrying out fixed asset physical inventory taking
- B. processing fixed asset purchase
- C. estimating fire insurance requirements
- D. All of the above
- E. None of the above Discuss
Correct Answer: None of the above
- 4. When installing an internal modem, all of the following IRQ's can be used except?
Options- A. 5
- B. 10
- C. 14
- D. All of the above
- E. None of the above Discuss
Correct Answer: 14
- 5. A NOR gate recognizes only the input word whose bits are _____
Options- A. 0's and 1's
- B. 1's
- C. 0's
- D. 0's or 1's
- E. None of the above Discuss
Correct Answer: 0's
- 6. Which of the following services dynamically resolves NetBIOS-to-IP resolution?
Options- A. DNS
- B. DHCP
- C. WINS
- D. LMHOSTS
- E. None of the above Discuss
Correct Answer: WINS
- 7. Which of the following is not true?
Options- A. 0X0 = 0
- B. 0 x 1 = 1
- C. 1 x 0 = 0
- D. 1 x 1 = 1
- E. None of the above Discuss
Correct Answer: 0 x 1 = 1
- 8. Which is a permanent database in the general model of compiler?
Options- A. Literal Table
- B. Identifier Table
- C. Terminal Table
- D. Source code
- E. None of the above Discuss
Correct Answer: Terminal Table
- 9. Which of the following is a machine language instruction?
Options- A. ADD 5
- B. 10001101
- C. GOTO XOUT
- D. All of the above
- E. None of the above Discuss
Correct Answer: 10001101
- 10. What difference does the 5th generation computer have from other generation computers?
Options- A. Technological advancement
- B. Scientific code
- C. Object Oriented Programming
- D. All of the above
- E. None of the above Discuss
Correct Answer: Technological advancement
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