Which of the following is a valid Java identifier?
A. $pay
B. 4myGrade!
C. newGrade!
D. 1dollar
Answer: A
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_____ is the process by which virtual private networks (VPNs) transfer information by encapsulating traffic in Internet Protocol (IP) packets over the Internet.
Fill in the blank(s) with the appropriate word(s).
Both Google and Yahoo! use ____________________ as their database engine.
Fill in the blank(s) with the appropriate word(s).
Suppose you enter 34.3, the ENTER key, 57.8, the ENTER key. Analyze the following code.
``` 1 Scanner input = new Scanner(System.in); 2 double v1 = input.nextDouble(); 3 double v2 = input.nextDouble(); 4 String line = input.nextLine(); ``` a. After line 2 is executed, v1 is 34.3. b. After line 3 is executed, v2 is 57.8. c. After line 4 is executed, line contains an empty string. d. After line 4 is executed, line is null. e. After line 4 is executed, line contains character "\n".
Which of the following statements about a file error state is false?
A. We can test the error status of a file using ferror. B. A file is put into the error state when an attempt is made to read a file in the write mode. C. A file is put into the error state when an open fails. D. Executing any file positioning function resets the file in a non-error state. E. A file in the error state cannot be read from or written to.