In Array Items Which Of The Following Expressions Will Retri

In Array Items Which Of The Following Expressions Will Retrieve

Arrays are fundamental data structures used in programming to store collections of elements. Understanding how to correctly access elements within an array is crucial for effective programming. The assignment involves multiple-choice questions that examine knowledge about array indexing, array traversal, and syntax in common programming languages such as Visual Basic and C#.

Paper For Above instruction

The first question asks about the syntax for accessing a specific element in a two-dimensional array. In many programming languages, array indexing starts at zero, and the correct way to access an element at row 3 and column 5 often involves nested indexing. In Visual Basic .NET, the syntax to access an element at a specific row and column in a two-dimensional array is items(3, 5). Hence, option D is correct. Other options such as items(3).(5) and items(3)(5) do not align with VB.NET or C# syntax standards, which do not permit chaining parentheses this way for multidimensional arrays.

Question two explores the meaning of the number in parentheses following an array name. This typically indicates the position index of an element within the array, relating to the concept of zero-based indexing prevalent in languages like C#, Java, and VB.NET. Therefore, the correct answer is B. 'position'. Options such as 'value', 'size', and 'length' refer to different characteristics of the array but do not directly describe the meaning of the parentheses or index.

The third question addresses the syntax for a For Each loop, an iteration construct used to traverse collections or arrays. The proper syntax in Visual Basic is For Each element As Type In arrayName. This format explicitly declares the iteration variable, its type, and the collection. Hence, option C is correct. The other options either omit the variable declaration or do not conform to standard syntax.

Question four presents a code sample that initializes an integer array and sums elements greater than 30. The array a() contains the elements {99, 22, 11, 3, 11, 55, 44, 88, 2, -3}. The code sums elements greater than 30: 99, 55, 44, and 88, which total 86. Summing these yields the total of 99 + 55 + 44 + 88 = 286. Therefore, the correct result stored in the variable 'result' is C. 286.

Question five asks about accessing a specific element in an array named Book. The array element at index 13 is accessed using Book(13) in VB.NET. Option B correctly reflects this syntax. The option Book(0) + 13 would attempt to add 13 to the element at index 0, which is irrelevant here. Book[13] or (13)Book are syntax errors in VB.NET. Therefore, the correct answer is B.

Finally, the sixth question involves a code snippet where an array a() contains integers, both positive and negative. The loop iterates through each element, adding only those greater than 30 to the variable 'result'. Elements exceeding 30 are 99, 55, 44, and 88, summing to 99 + 55 + 44 + 88 = 286. Hence, the correct answer is C. 286.

References

  • Albahari, J., & Albahari, B. (2021). C# 9.0 in a Nutshell: The Definitive Reference. O'Reilly Media.
  • Balgisen, A., & Kadry, S. (2020). Data Structures and Algorithms in VB.NET. Springer.
  • Gamma, E., Helm, R., Johnson, R., & Vlissides, J. (1994). Design Patterns: Elements of Reusable Object-Oriented Software. Addison-Wesley.
  • Heimsoth, J. (2019). Mastering C# and .NET Framework. Packt Publishing.
  • Microsoft. (2023). Visual Basic documentation. https://docs.microsoft.com/en-us/dotnet/visual-basic/
  • Meijer, E. (2011). Functional Programming in .NET. Communications of the ACM, 54(4), 57-64.
  • Rebert, F. (2017). Understanding Arrays in Programming. Journal of Computer Science and Engineering.
  • Sedgewick, R., & Wayne, K. (2011). Algorithms (4th ed.). Addison-Wesley.
  • Stroustrup, B. (2013). The C++ Programming Language. Addison-Wesley.
  • Yadav, S. (2022). Introduction to Data Structures and Algorithms. EduTech Publishers.

Related Assignments