Numbers and Strings

Swift Strings: Numbers and Strings

Use string interpolation to mix numbers with text.

Convert numbers to strings explicitly with String(value) when concatenating.

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Mix Text and Numbers

Use interpolation to embed numbers directly in strings, or convert numbers with String(value) when concatenating.

Example

let age = 5
print("Age: \(age)")          // interpolation
let text = "You are " + String(age)
print(text)
let pi = 3.14
print("pi = \(pi)")

This example shows interpolation and explicit conversion with String().

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Convert String to Number

Use numeric initializers like Int("123") which return optionals because conversion can fail.

Example

let s1 = "123"
let n1 = Int(s1)           // Int?
print(n1 ?? 0)

let s2 = "abc"
let n2 = Int(s2)           // nil (not a number)
print(n2 == nil)