[Solved] What will be the output of this Swift code?var temperature: Int? = nil if let temp = temperature { print("Temp is \(temp)") } else { print("Temperature unknown") } | iOS Swift

iOS Swift - Swift Language Essentials

What will be the output of this Swift code?

var temperature: Int? = nil
if let temp = temperature {
  print("Temp is \(temp)")
} else {
  print("Temperature unknown")
}

ATemp is 0

BTemperature unknown

CRuntime error

DTemp is nil

Step-by-Step Solution

Solution:

Step 1: Analyze the Optional variable
The variable temperature is an Optional Int initialized to nil.
Step 2: Understand optional binding
The if let statement unwraps temperature safely. Since it is nil, the else block executes.
Final Answer:
Temperature unknown -> Option B
Quick Check:
Nil Optional triggers else block in if let [OK]

Quick Trick: If Optional is nil, if let else block runs [OK]

Common Mistakes:

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