Chapter 18: Problem 27

Write two different code segments that may be used to wrap an index back around to the beginning of an array when it moves past the end of the array. Use an if/else statement in one segment and modular arithmetic in the other.

Short Answer

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The two methods used to handle wrapping an index back to the beginning of an array when it moves past the end of the array are: 1. Using an if/else statement to check if the index is greater than or equal to the length of the array, and adjusting the index accordingly when it surpasses the array length. 2. Using modular arithmetic to calculate the remainder of the index divided by the length of the array, effectively wrapping the index back to the beginning if it surpasses the array length.

Step by step solution

Code Segment Using If/Else Statement

1. Initialize an array and its length. 2. Create a variable that represents the index. 3. Use an if/else statement to check if the index is greater than or equal to the length of the array. a. If the index is greater than or equal to the length of the array, subtract the length of the array from the index to wrap it back to the beginning. b. Otherwise, use the original index. 4. Print the wrapped index. Example code in Python: ```python array = [1, 2, 3, 4, 5] length = len(array) index = 5 if index >= length: wrapped_index = index - length else: wrapped_index = index print(wrapped_index) ```

Code Segment Using Modular Arithmetic

1. Initialize an array and its length. 2. Create a variable that represents the index. 3. Use modular arithmetic to wrap the index back to the beginning of the array. Calculate the remainder of the index divided by the length of the array. 4. Print the wrapped index. Example code in Python: ```python array = [1, 2, 3, 4, 5] length = len(array) index = 5 wrapped_index = index % length print(wrapped_index) ```

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Write two different code segments that may be used to wrap an index back around to the beginning of an array when it moves past the end of the array. Use an if/else statement in one segment and modular arithmetic in the other.

Short Answer

Step by step solution

Code Segment Using If/Else Statement

Code Segment Using Modular Arithmetic

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