[Solved] Identify the error in this Swift switch statement:let x = 2 switch x { case 1: print("One") fallthrough case 3: print("Three") } | Swift

Swift - Control Flow

Identify the error in this Swift switch statement:

let x = 2
switch x {
 case 1:
  print("One")
  fallthrough
 case 3:
  print("Three")
}

ANo error; code runs fine

BMissing default case causes error

CFallthrough to a non-adjacent case is invalid

DFallthrough must be last statement in case

Step-by-Step Solution

Solution:

Step 1: Exhaustiveness requirement
Swift switch statements must be exhaustive, covering all possible input values or including a default case.
Step 2: Identify the problem
Cases cover only 1 and 3; no default means values like 2 (and others) are uncovered, causing compile error.
Final Answer:
Missing default case causes error -> Option B
Quick Check:
Non-exhaustive switch error [OK]

Quick Trick: Swift switch must be exhaustive or have default [OK]

Common Mistakes:

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