[Solved] Consider this Swift code:let num = 3 switch num { case 1: print("One") case 2: print("Two") case 3: print("Three") fallthrough case 4: print("Four") default: print("Default") }What is the output? | Swift

Swift - Control Flow

Consider this Swift code:

let num = 3
switch num {
 case 1:
  print("One")
 case 2:
  print("Two")
 case 3:
  print("Three")
  fallthrough
 case 4:
  print("Four")
 default:
  print("Default")
}

What is the output?

AThree\nFour

BThree

CFour

DThree\nFour\nDefault

Step-by-Step Solution

Solution:

Step 1: Identify matched case and fallthrough
Value 3 matches case 3, prints "Three", then fallthrough moves to case 4.
Step 2: Output from case 4 and default
Case 4 prints "Four"; default is skipped because fallthrough only moves one case.
Final Answer:
Three Four -> Option A
Quick Check:
fallthrough prints next case only [OK]

Quick Trick: fallthrough only moves to immediate next case [OK]

Common Mistakes:

Expecting default to print after fallthrough
Ignoring fallthrough effect
Thinking fallthrough repeats current case

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Consider this Swift code:

Step 1: Identify matched case and fallthrough

Step 2: Output from case 4 and default

Final Answer:

Quick Check:

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