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Questions and Answers
Which of the following best describes a two-dimensional array?
Which of the following best describes a two-dimensional array?
- A table of 10 rows
- A collection of data records represented as rows and columns (correct)
- A single line of elements
- A data record
What is the purpose of using two subscripts to index a two-dimensional array?
What is the purpose of using two subscripts to index a two-dimensional array?
- To differentiate between primitive and object types
- To indicate the type of data stored in the array
- To represent the row and column of a specific element (correct)
- To determine the size of the array
Which of the following is a characteristic of a two-dimensional array?
Which of the following is a characteristic of a two-dimensional array?
- The size of the array is determined by the number of rows
- Elements can be of different types
- The size of the array is determined by the number of columns
- All elements must be of the same type (correct)
Which of the following accurately describes the characteristics of a stack?
Which of the following accurately describes the characteristics of a stack?
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What is the purpose of the 'push()' method in a stack?
What is the purpose of the 'push()' method in a stack?
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Which of the following applications uses a stack?
Which of the following applications uses a stack?
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In the given example, what is the value of variable X after executing 'X = Numbers.pop()' for the first time?
In the given example, what is the value of variable X after executing 'X = Numbers.pop()' for the first time?
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Study Notes
Two-Dimensional Arrays
- A two-dimensional array is a collection of elements arranged in rows and columns, with each element identified by two subscripts or indices.
- Using two subscripts to index a two-dimensional array allows for easy access and manipulation of individual elements.
Characteristics of Two-Dimensional Arrays
- A characteristic of a two-dimensional array is that it can be visualized as a table or matrix with rows and columns.
Stacks
- A stack is a data structure that follows the Last-In-First-Out (LIFO) principle, meaning the last element added is the first one to be removed.
- The purpose of the 'push()' method in a stack is to add an element to the top of the stack.
- Applications that use stacks include recursive functions, parsing, and evaluating postfix expressions.
Stack Operations
- The 'pop()' method is used to remove and return the top element from the stack.
- In the given example, after executing 'X = Numbers.pop()' for the first time, the value of variable X is the topmost element that was added last to the Numbers stack.
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