[Swift Apple ] 6. Letters and Words (Characters & Strings)

Apple Swift Language 6. Letters and Words (Characters & Strings)”

✉️ 6. Letters and Words (Characters & Strings)

Hello again! 😊 So far, we’ve learned about numbers, calculations, variables, and constants.

Today, we’ll learn how Swift works with letters and sentences using something called Characters and Strings.

We’ll even build a fun mini app that greets you using your name. Let’s go!

🆎 Character vs String

In programming, we use two types to represent letters and words:

Name	Description	Examples	Swift Type
Character	A single letter or symbol	“A”, “가”, “3”	Character
String	A word or sentence	“Hello”, “Hi!”	String

Example:

var letter: Character = "A"
var message: String = "Hello, Swift!"

• A Character holds one single letter

• A String holds multiple letters or full sentences

🧪 Practice: Greeting App with Your Name

Let’s make a small app that says hello using your name!

var name: String = "Minjun"
print("Hello, \(name)! Nice to meet you 😊")

Output:

Hello, Minjun! Nice to meet you 😊

Now try changing the name:

name = "Jiyoo"

You’ll see:

Hello, Jiyoo! Nice to meet you 😊

💡 \(name) is called string interpolation. It’s how we add variables inside a sentence in Swift!

💬 Looping Through Each Letter

What if you want to look at each letter in a word?

let greeting = "Hi"
for char in greeting {
    print(char)
}

Output:

H
i

That’s how we know a String is really a group of Characters!

✨ Wrapping Up

Today, we learned how to work with letters and words in Swift:

• Character = one letter

• String = a word or full sentence

• You can use print and \() to show personalized messages

Now you know how to build a greeting app using your name — how cool is that? 😄

Next time, we’ll talk about something called ✅ True or False (Bool).

We’ll learn how to answer questions like: “Did I finish my homework?” using true or false in code!