Scripting and Programming (Foundations) D278
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Free Scripting and Programming (Foundations) D278 Questions
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.
A software developer determines the mathematical operations that a calculator program should support. Which two waterfall approach phases are involved?
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Analysis and design
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Design and implementation
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Design and testing
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Implementation and testing
Explanation
Explanation
Correct answer: (A.) Analysis and design
Determining what operations the calculator should support is part of understanding the system requirements, which occurs during the analysis phase. Planning how these operations will be implemented, such as outlining functions or designing modules to perform the calculations, occurs during the design phase. Implementation comes later when the actual coding is done, and testing verifies correctness. Therefore, the two relevant phases are analysis and design.
What is a characteristic of a compiled language?
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Runs on any machine having an interpreter
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Is slower than an interpreted language
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Converts to machine language before running
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Runs one statement at a time by another program
Explanation
The correct characteristic of a compiled language is that it converts to machine language before running. A compiler translates the entire program's source code into machine code, which is then executed. This is in contrast to interpreted languages, where code is translated and executed line by line during runtime.
Correct answer
C) Converts to machine language before running
Which two situations would be helped by using a programming library?
Choose 2 answers.
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A programming student is writing code to iterate through the integers in a list and determine the maximum
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A programmer is writing a piece of mathematical code that requires the heavy use of recursive functions
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A programmer needs to perform a series of file compression tasks. These tasks are commonly performed by programmers, and the programmer does not want to have to code them all by hand
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A programmer is developing a database application that can house various types of data. The software cannot know ahead of time the data type, and so the programmer needs variables that do not require an initial declaration type
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A video game programmer needs to perform several animation tasks, all of which are very common in the industry. The programmer does not want to have to code each task, and they are unsure if they even know how to code a few of them
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A programmer needs to write several interacting objects for a student gradebook application, some of which need an inheritance structure
Explanation
Correct answer: (C) A programmer needs to perform a series of file compression tasks. These tasks are commonly performed by programmers, and the programmer does not want to have to code them all by hand and (E) A video game programmer needs to perform several animation tasks, all of which are very common in the industry. The programmer does not want to have to code each task, and they are unsure if they even know how to code a few of them
Programming libraries are most useful when developers need functionality that is commonly implemented and already available as reusable code. Tasks like file compression and animation in video games are complex but widely used, so libraries often provide ready-made functions for them. Using these libraries saves development time and allows programmers to rely on tested implementations rather than writing the functionality from scratch.
The command 'chmod a+x' will:
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Remove execute permission for all users
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Add execute permissions for the user owner
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Remove execute permissions for the user owner
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Add execute permission for all users
Explanation
Correct Answer
D. Add execute permission for all users
Explanation
The command chmod a+x adds execute permission for all users (user, group, and others). The a stands for "all" users, and +x adds the execute permission.
Why other options are wrong
A. Remove execute permission for all users
This is incorrect because chmod a+x adds execute permission, not removes it. To remove execute permission for all users, the command would be chmod a-x.
B. Add execute permissions for the user owner
This is incorrect because the command applies to all users, not just the user owner. If we wanted to add execute permissions for only the user owner, we would use chmod u+x.
C. Remove execute permissions for the user owner
This is incorrect because the +x adds execute permissions, rather than removing them. If the goal was to remove execute permissions for the user owner, the correct command would be chmod u-x.
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.
Which elements are characteristic of a class diagram?
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Internal structure of a class and collaboration between classes or instances
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Physical resources or logical architecture of a system
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System’s classes, attributes, and methods and their features, constraints, and relationships
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Flow of logic and process interaction within a system
Explanation
Explanation
A class diagram is a type of UML diagram that depicts the system’s classes, attributes, and methods, along with their features, constraints, and relationships. It shows the structure of the system in terms of classes and how they relate to each other.
Correct answer
C) System’s classes, attributes, and methods and their features, constraints, and relationships
Debugging is:
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Tracking down programming errors and correcting them
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Documenting the bugs in a program
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Creating/writing a series of software tests
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Finding all the bugs in a program
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Running a program through a series of tests
Explanation
Correct Answer
A. Tracking down programming errors and correcting them
Explanation
Debugging is the process of identifying and fixing errors or bugs in a program. It involves carefully analyzing the code, finding where issues exist, and applying fixes to ensure the program runs correctly. Debugging is essential to ensure the functionality and performance of the software.
Why other options are wrong
B. Documenting the bugs in a program
While documenting bugs is important for tracking and fixing them, it is not the process of debugging itself. Debugging goes beyond documentation to actively fixing the issues identified.
C. Creating/writing a series of software tests
This describes the creation of test cases or test suites, which is part of the testing phase of software development. Debugging, however, involves fixing issues found during testing or execution, not just creating tests.
D. Finding all the bugs in a program
While debugging involves finding and fixing bugs, its primary purpose is not just to find all bugs but to correct them. Finding bugs alone does not complete the debugging process.
E. Running a program through a series of tests
Running tests is part of the testing phase, which identifies potential issues, but debugging specifically addresses the process of correcting the bugs discovered during testing. Debugging includes more than just running tests; it also involves fixing the identified issues.
The ____ user is granted extensive powers in UNIX/Linux to administer the system.
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root
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administrator
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super user
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power user
Explanation
Correct Answer
A. root
Explanation
In UNIX/Linux systems, the root user has full administrative privileges, allowing them to manage system configurations, install software, modify critical system files, and perform other high-level tasks. This user has unrestricted access to the entire system.
Why other options are wrong
B. administrator
This term is typically used in the context of Windows systems. While some UNIX/Linux systems may use the term "administrator" as a synonym for the root user, the official term for the superuser in UNIX/Linux is root.
C. super user
While the term "superuser" refers to the root user, the precise name for the user with extensive system administration powers in UNIX/Linux is root. "Superuser" is a more general term used to describe the user account with administrative access.
D. power user
A "power user" is someone with advanced knowledge of the system and can perform tasks beyond the typical user level, but they do not have the full administrative privileges of the root user. Power users may have elevated privileges but cannot make system-wide changes like the root user can.
What is a shell script
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A sequence of control statements interpreted and executed one at a time
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A type of command that accesses the file system
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A command that searches, selects, and processes data from files
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A built-in operating system utility for file operations
Explanation
Correct Answer A. A sequence of control statements interpreted and executed one at a time
Explanation
A shell script is a program written in a scripting language, typically Bash or another shell interpreter, that contains a series of commands to be executed by the shell. These commands are executed in sequence, and the script can include control statements (such as loops, conditionals, and functions) to automate tasks. Shell scripts are often used for system administration, automation of repetitive tasks, and managing system configurations.
Why other options are wrong
B. A type of command that accesses the file system
This option is incorrect because a shell script is not simply a command; it is a sequence of commands and control structures. While shell scripts can interact with the file system, their purpose extends beyond that, allowing for complex workflows and automation.
C. A command that searches, selects, and processes data from files
This option is incorrect because it describes the behavior of specific shell commands (like grep, find, or awk), but a shell script can include many other commands and control structures to perform a variety of tasks, not just search and process data.
D. A built-in operating system utility for file operations
This option is incorrect because it describes the behavior of commands like cp, mv, or rm, which are individual utilities for file operations. A shell script is more than just a utility; it is a way to combine multiple commands and automate complex tasks.
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