1. Introduction

Searching for a character within a string is a foundational operation in many programming scenarios. In Swift, the String type provides easy-to-use methods for these types of operations. In this tutorial, we'll walk through how to determine if a string contains a particular character in Swift.

2. Program Overview

For our program, we'll:

1. Initialize a string.

2. Declare a character we want to search for.

3. Check if the string contains the character.

4. Display the result.

3. Code Program

// Initializing a stringlet mainString = "Hello, World!"// Character we want to search forlet characterToSearch: Character = "W"// Checking if the string contains the characterif mainString.contains(characterToSearch) {    print("The string contains the character \(characterToSearch).")} else {    print("The string does not contain the character \(characterToSearch).")}

Output:

The string contains the character W.

4. Step By Step Explanation

1. We start by initializing amainString with the value "Hello, World!".

2. We then declare a charactercharacterToSearch that we want to search within the main string. In this case, we're looking for the character "W".

3. Thecontains method of the String type checks if the string contains the character. It returns a boolean value (true if the string contains the character, false otherwise).

4. We use anif-else statement to evaluate the result of thecontains method and then display an appropriate message based on the result.

This method is case-sensitive. For case-insensitive searches, you may need to convert both the string and the character to a common casing (like lowercase) before performing the search.