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Which of the following is the correct way to declare a constant in Swift?

easy📝 Syntax Q12 of 15
iOS Swift - Swift Language Essentials
Which of the following is the correct way to declare a constant in Swift?
Avar pi = 3.14
Bconstant pi = 3.14
Cconst pi = 3.14
Dlet pi = 3.14
Step-by-Step Solution
Solution:

  1. Step 1: Recall Swift syntax for constants

    Swift uses let to declare constants that cannot change.

  2. Step 2: Identify the correct syntax

    var declares variables, const and constant are not Swift keywords.

  3. Final Answer:

    let pi = 3.14 -> Option D

  4. Quick Check:

    Constants use let keyword [OK]
Quick Trick: Use let for constants, var for variables [OK]
Common Mistakes:
  • Using var instead of let for constants
  • Using const or constant which are not Swift keywords
  • Confusing variable and constant declarations

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