Scripting and Programming (Foundations) D278
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Free Scripting and Programming (Foundations) D278 Questions
In UNIX/Linux, which of the following describes the function of the 'write' permission for a file?
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Allows the user to view the contents of the file
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Allows the user to modify the contents of the file
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Allows the user to run the file as a program
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Allows the user to change the ownership of the file
Explanation
Correct Answer
B. Allows the user to modify the contents of the file
Explanation
The 'write' permission in UNIX/Linux allows a user to modify the contents of a file. If a user has write permission for a file, they can edit, add, or delete data within that file. Without this permission, a user can neither modify nor save changes to the file.
Why other options are wrong
A. Allows the user to view the contents of the file
This is incorrect because viewing the contents of a file is associated with the 'read' permission, not the 'write' permission. The read permission allows a user to view the file's contents without modifying it.
C. Allows the user to run the file as a program
This is incorrect because the 'execute' permission is required to run a file as a program. The 'write' permission is for modifying the file's contents, not executing it.
D. Allows the user to change the ownership of the file
This is incorrect because changing ownership of a file is typically governed by the 'chown' command and requires administrative privileges (root). The 'write' permission does not allow a user to change file ownership.
The steps in an algorithm to build a picnic table are given.
- Measure and mark the lumber cuts that need to be made.
- Buy the needed materials.
- Determine the needed materials.
- Cut the lumber to the proper dimensions.
- Assemble the pieces and paint.
Which two steps of the algorithm should be switched to make the algorithm successful?
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2 and 4
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1 and 2
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1 and 3
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2 and 3
Explanation
Correct answer: (D.) 2 and 3
For the algorithm to work correctly, the builder must first determine what materials are required before purchasing them. In the current sequence, step 2 instructs buying materials before step 3 determines what those materials are. This creates a logical problem because it is not possible to purchase the correct supplies without first identifying them. By switching steps 2 and 3, the process becomes logical: first determine the materials needed, then buy them. The rest of the steps—measuring, cutting, assembling, and painting—can then follow in a workable order.
A function should return 0 if a number, N, is even and 1 if N is odd.
What should be the input to the function?
-
1
-
Even
-
N
-
0
Explanation
Correct answer: (C) N
The function needs to know which number to check for evenness or oddness. Therefore, the input should be the number itself, represented by N. Constants like 0 or 1, or the word “Even,” cannot provide the specific number to evaluate.
What does the following algorithm accomplish?
x = Get next input
if x == -1:
Put "Goodbye" to output
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Outputs "x" when user types -1
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Outputs -1 when user types any input
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Outputs Goodbye when user types -1
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Outputs -1 when x is positive
Explanation
Explanation
The algorithm checks if the input x is equal to -1. If so, it outputs "Goodbye". It will only output "Goodbye" when the user types -1.
Correct answer
C) Outputs Goodbye when user types -1
What is a key distinction between shell scripts and programs written in high-level programming languages regarding execution?
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Shell scripts must be compiled before execution
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Shell scripts can be executed directly without compilation
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High-level programs can only be executed in a specific directory
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Shell scripts require a graphical user interface to run
Explanation
Correct Answer
B. Shell scripts can be executed directly without compilation
Explanation
Shell scripts are typically written in a scripting language that does not require compilation. Instead, they are executed by an interpreter, which processes the commands directly from the script. This allows for quick testing and modification of the script without the need for a separate compilation step, making it faster and easier to execute.
Why other options are wrong
A. Shell scripts must be compiled before execution
This is incorrect because shell scripts do not require compilation. They are interpreted directly by the shell, which reads and executes each command line-by-line. Unlike compiled languages, they are not converted into machine code beforehand.
C. High-level programs can only be executed in a specific directory
This option is incorrect because the location of execution for high-level programs is not restricted to a specific directory. High-level programs can be executed from any directory, as long as the system has the appropriate permissions and the executable is accessible.
D. Shell scripts require a graphical user interface to run
This is incorrect because shell scripts can run in a command-line interface (CLI) without the need for a graphical user interface (GUI). They are often used in terminal or console environments, making them independent of any graphical interface.
What does a function definition consist of?
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An invocation of a function's name
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The function's name, inputs, outputs, and statements
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The function's argument values
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A list of all other functions that call the function
Explanation
Correct answer: (B) The function's name, inputs, outputs, and statements
A function definition specifies how a function works. It includes the function’s name, the inputs it accepts (parameters), the outputs it produces (return values), and the statements or code that are executed when the function is called. Simply invoking the function, listing argument values, or noting which functions call it does not define the function itself.
A ________ is simply a list of options; when an option is selected by the user, a specific command is invoked.
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Form
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Button
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Menu
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List
Explanation
Correct Answer
C. Menu
Explanation
A menu is a user interface element that displays a list of options. When a user selects an option, the corresponding command or action is invoked. Menus are common in graphical user interfaces (GUIs) as well as in text-based applications to allow users to easily choose from available commands or actions.
Why other options are wrong
A. Form
This is incorrect because a form is a collection of fields where users can enter data. While forms may include menus as part of the interface, the form itself is not a list of options where commands are executed upon selection.
B. Button
This is incorrect because a button typically initiates an action when clicked, but it does not provide a list of options. A button triggers a single command or action, not a menu of choices.
D. List
This is incorrect because a list is simply an arrangement of items or data. While a list may contain options, it doesn't inherently imply that selecting an item will trigger a command, as menus do.
Java provides an interface called Map that specifies the methods a map should provide; the put(key, value) method does what
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none of these
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adds a new key-value pair to the Map, or if the key is already in the map, does not change the value
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adds a new key-value pair to the Map, or if the key is already in the map, it replaces the value associated with key
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looks up a key and returns the corresponding value
Explanation
Correct Answer C. adds a new key-value pair to the Map, or if the key is already in the map, it replaces the value associated with key
Explanation
The put(K key, V value) method in the Map interface is used to insert a key-value pair into the map. If the key is not already in the map, it adds the new entry. If the key is already present, the existing value is replaced with the new one. This method also returns the previous value associated with the key, or null if there was no mapping.
Why other options are wrong
A. none of these
This is incorrect as option C accurately describes the method's function.
B. adds a new key-value pair to the Map, or if the key is already in the map, does not change the value
This contradicts the actual behavior. put() does update the value if the key already exists.
D. looks up a key and returns the corresponding value
This describes the behavior of the get(key) method, not put().
What does an output of 1 indicate for the following algorithm running on a five-element list of integers?
i = 0
x = 0
while i < 5:
if list[i] < 0:
x = 1
i = i + 1
Put x to output
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All integers are positive.
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At least one integer is positive.
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At least one integer is negative.
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All integers are negative.
Explanation
Explanation
The algorithm checks each element of the list and sets x to 1 if any element is negative (list[i] < 0). The output of 1 means that at least one integer in the list is negative.
Correct answer
C) At least one integer is negative.
What is an example of an algorithm?
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The sign of two integers determines the sign of the product
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Unplug the device, wait 30 seconds, and restore the device
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A webpage uses an HTML file type.
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The list contains apples, bananas, and oranges.
Explanation
Correct answer: (B.) Unplug the device, wait 30 seconds, and restore the device
An algorithm is a step-by-step procedure or set of instructions designed to solve a specific problem or accomplish a task. Option B describes a clear, ordered sequence of steps to solve a problem—resetting a device—making it an algorithm. The other options describe rules, file types, or lists, which are not step-by-step procedures.
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