Which of the following correctly declares a mutable variable age with an initial value of 30 in Swift?

easy📝 Conceptual Q2 of 15

Swift - Variables and Constants

Which of the following correctly declares a mutable variable age with an initial value of 30 in Swift?

Aage var = 30

Blet age = 30

Cvar age: String = 30

Dvar age = 30

Step-by-Step Solution

Solution:

Step 1: Syntax for mutable variable
Use var followed by the variable name and assignment to declare a mutable variable.
Step 2: Check type compatibility
Assigning 30 (an Int) to age is valid if type is inferred or declared as Int.
Final Answer:
var age = 30 -> Option D
Quick Check:
Mutable variable declaration uses var [OK]

Quick Trick: Use var name = value for mutable variables [OK]

Common Mistakes:

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