Which of the following is NOT a factor that will vary by user and as such should be included in the development process?
A. download speed
B. screen resolution
C. user error
D. operating system
Answer: C
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Which of the following is not a compilation error?
a. Neglecting to initialize a local variable in a method before it is used. b. Placing a semicolon at the end of the first line of an if statement. c. Omitting the left and right parenthesis for the condition of an if statement. d. All are compilation errors.
When a server executes the accept() method it:
(a) Blocks and waits for a connection (b) Checks for a connection and if there is none it exits (c) Blocks but in a new thread (d) Any of the above, depending on the input parameters to accept()
The reference to the next node in a linked list is referred to as a(n) ______________ .
Fill in the blank(s) with the appropriate word(s).
Write an application with a GUI that will convert numbers from binary to octal. Binary numbers are composed of just the digits 0 and 1. Octal numbers use the digits 0, 1, 2, 3, 4, 5, 6, and 7. Note that each octal digit corresponds to a three-bit binary number, as follows:
000 0 001 1 010 2 011 3 100 4 101 5 110 6 111 7 To convert a number from binary to octal, first group the bits in the binary number into sets of three and then apply the equivalent octal numbers. For example, the binary number 001000101110 would be grouped as 001 000 101 110, which corresponds to the octal digits 1, 0, 5, and 6, respectively, Thus, the octal equivalent of the binary number is 1056. If the number of bits in the binary number is not divisible by 3, add zeros at its beginning until it is. For example, since the binary number 1011011100100 has 13 bits, we would add two zeros before it to get 001011011100100. We would then group its bits as 001 011 011 100 100 and get 13344 as its octal equivalent. To convert an octal number to binary, we use our correspondence table in the reverse direction. For example, the octal number 716 is 111 001 110, or 111 001 110 in binary. Your application can omit the spaces we use to show the grouping of the bits. You will need a text field for the user to enter a number and a label for the results. Provide three buttons: To Octal, To Binary, and Clear. If the user clicks the Clear button, clear any text in the text field and label. If the user clicks one of the two conversion buttons, check whether the number in the text field is in the correct format. If it is not, display the message Bad Format in the results label. If the format is ok, compute the converted value and display that in the results label. This application does a conversion between binary and octal. Unlike the binary to decimal conversion, this can be done without any mathematics. We just need to have a translation table between octal digits to strings of binary bits. One complication is that when we translate from binary, we want to have groups of 3 bits. If the length of the string of binary bits is not divisible by 3, we will add zeros to the front. A couple methods are used to verify that the input strings are valid. Methods were also created for the conversions.