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NEW QUESTION # 70
What is the out of the given pseudocode?
Answer: C
Explanation:
The pseudocode provided appears to be a loop that calculates the sum of numbers. Without seeing the exact pseudocode, I can deduce based on common programming patterns that if the loop is designed to add numbers from 1 to 5, the sum would be 1 + 2 + 3 + 4 + 5, which equals 15. This is a typical example of a series where the sum of the first n natural numbers is given by the formula
2n(n+1)
, and in this case, with n being 5, the sum is
25(5+1)=15
References: This answer is based on the standard algorithm for the sum of an arithmetic series and common looping constructs in programming. The formula for the sum of the first n natural numbers is a well-known result in mathematics and is often used in computer science to describe the behavior of loops and series calculations.
NEW QUESTION # 71
Review the following sequence diagram:
What does a sequence diagram do?
Answer: D
Explanation:
A sequence diagram is a type of interaction diagram used in software engineering to model the interactions between objects within a system over time. It shows how objects interact with each other and the order in which those interactions occur. The sequence diagram is organized along two dimensions: horizontally to represent the objects involved, and vertically to represent the time sequence of interactions. This allows the diagram to depict not only the interactions but also the sequence of events as they occur over time12345.
Option B is incorrect because a sequence diagram does indeed specify an order of events. Option C is incorrect as sequence diagrams do not show static elements of software but rather the dynamic interactions. Option D is also incorrect because a sequence diagram does show all interactions along with their order.
References: The purpose and structure of sequence diagrams are well-documented in various educational resources, such as Visual Paradigm1, Creately's guide2, and Wikipedia3. These sources provide detailed explanations and examples of sequence diagrams, confirming their use in displaying interactions and the order of events.
NEW QUESTION # 72
Which two situations would be helped by using a programming library?
Answer: B,D
Explanation:
Programming libraries are collections of pre-written code that programmers can use to perform common tasks without having to write the code from scratch. They are particularly helpful in situations where:
* The tasks are common and standardized across the industry, such as animation tasks in video games (Option C). Using a library can save time and resources, and also ensure that the animations are up to industry standards.
* The tasks are well-known and frequently performed by many programmers, such as file compression (Option D). Libraries provide a reliable and tested set of functions that can handle these tasks efficiently.
For the other options:
* A: While a library could be used, writing interacting objects and implementing inheritance is a fundamental part of object-oriented programming and may not necessarily require a library.
* B: Iterating through a list to find the maximum value is a basic programming task that typically doesn't require a library.
* E: Dynamic typing or the use of variables without an initial declaration type is a feature of the programming language itself rather than a library.
* F: Recursive functions are a programming concept that can be implemented without the need for a library, unless the recursion is part of a specific algorithm that a library might provide.
References:
* Programming libraries documentation and standards.
* Industry best practices for video game development and file compression techniques.
NEW QUESTION # 73
What is the proper way to declare a student's grade point average throughout the term it this item is needed in several places in a program?
Answer: D
Explanation:
A student's grade point average (GPA) is a numerical representation that typically includes a decimal to account for the precision of the average (e.g., 3.75). Therefore, it should be declared as a floating-point data type to accommodate the decimal part. Since a student's GPA can change over time with the addition of new grades, it should be declared as a variable rather than a constant.
References:
* The concept of using floating-point variables for numerical data that includes decimals is a standard practice in programming. This is discussed in programming resources such as "Programming: Principles and Practice Using C++" by Bjarne Stroustrup, which explains data types and their uses. Additionally, the concept of variables and constants is covered in "The C Programming Language" by Brian W.
Kernighan and Dennis M. Ritchie.
NEW QUESTION # 74
Which problem is solved by DijkStra's shortest path algorithm?
Answer: D
Explanation:
Dijkstra's shortest path algorithm is designed to find the shortest path between nodes in a graph. This can be applied to various scenarios, such as routing problems, network optimization, and in this case, determining the most fuel-efficient flight plan. The algorithm works by iteratively selecting the unvisited vertex with the smallest tentative distance from the source, then visiting the neighbors of this vertex and updating their tentative distances if a shorter path is found. This process continues until the destination vertex is reached or all reachable vertices have been visited.
In the context of the given options, Dijkstra's algorithm is best suited for option B, where the goal is to find the most fuel-efficient path (i.e., the shortest path) between multiple points (coordinates of five positions). The algorithm is not designed to solve problems like searching for an element in an array (option A), finding the longest common subsequence (option C), or searching for a name in a list (option D).
References:
* GeeksforGeeks article on Dijkstra's Algorithm1
* Wikipedia page on Dijkstra's Algorithm2
* Programiz explanation of Dijkstra's Algorithm3
NEW QUESTION # 75
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