[Solved] What will this Swift code print?func add(_ a: Int, _ b: Int = 5) -> Int { return a + b } print(add(3)) print(add(3, 4)) | Swift

Swift - Functions

What will this Swift code print?

func add(_ a: Int, _ b: Int = 5) -> Int {
    return a + b
}
print(add(3))
print(add(3, 4))

A8\n8

B3\n7

CError: Missing argument for 'b'

D8\n7

Step-by-Step Solution

Solution:

Step 1: Evaluate first function call
add(3) uses default b=5, so returns 3+5=8.
Step 2: Evaluate second function call
add(3,4) uses b=4 explicitly, returns 3+4=7.
Final Answer:
8\n7 -> Option D
Quick Check:
Default parameter used only if argument omitted [OK]

Quick Trick: Default used only when argument is missing [OK]

Common Mistakes:

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