Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN: 9780133594140
Author: James Kurose, Keith Ross
Publisher: PEARSON
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Using Scheme: 

**Title: Creating a Function to Select Multiples in Scheme**

**Objective:**
Learn how to write a function named `select-multiples` in Scheme that processes an integer and a list of integers. The function will utilize `fold` (or `reduce`) to return a list of elements that are multiples of the specified integer.

**Instructions:**

1. **Function Requirements:**
   - Create a function `select-multiples value lst`, which uses `fold` or `reduce` to determine multiples of `value` in the list `lst`.

2. **Constraints:**
   - The vast majority of the work should be handled by `fold` or `reduce`. Minimal processing is permitted outside the `fold` call.
   - You may add the line `(require 'list-lib)` to access the built-in `fold` method.
   - Do not use the built-in `select` function.

3. **Understanding `fold`:**
   - The `fold` function parameters are ordered as follows: `action partial-result lst`.
   - You need to identify if `num` is a multiple of `value` by verifying if `(mod num value)` equals 0.

4. **Examples:**

   - `(my-select 5 '(5))` should return `(5)`
   - `(my-select 3 '(7 9))` should return `()`
   - `(my-select 5 '(1 15 25))` should return `(15 25)`
   - `(my-select 2 '())` should return `()` 

This approach emphasizes functional programming concepts, particularly leveraging higher-order functions like `fold` to simplify data processing tasks in Scheme.
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Transcribed Image Text:**Title: Creating a Function to Select Multiples in Scheme** **Objective:** Learn how to write a function named `select-multiples` in Scheme that processes an integer and a list of integers. The function will utilize `fold` (or `reduce`) to return a list of elements that are multiples of the specified integer. **Instructions:** 1. **Function Requirements:** - Create a function `select-multiples value lst`, which uses `fold` or `reduce` to determine multiples of `value` in the list `lst`. 2. **Constraints:** - The vast majority of the work should be handled by `fold` or `reduce`. Minimal processing is permitted outside the `fold` call. - You may add the line `(require 'list-lib)` to access the built-in `fold` method. - Do not use the built-in `select` function. 3. **Understanding `fold`:** - The `fold` function parameters are ordered as follows: `action partial-result lst`. - You need to identify if `num` is a multiple of `value` by verifying if `(mod num value)` equals 0. 4. **Examples:** - `(my-select 5 '(5))` should return `(5)` - `(my-select 3 '(7 9))` should return `()` - `(my-select 5 '(1 15 25))` should return `(15 25)` - `(my-select 2 '())` should return `()` This approach emphasizes functional programming concepts, particularly leveraging higher-order functions like `fold` to simplify data processing tasks in Scheme.
Expert Solution
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Step 1

So below the function is implemented below in Scheme 

 

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