Which of the following is the correct syntax to declare a function add that takes two Int parameters and returns their sum as an Int?

easy📝 Syntax Q12 of 15

Kotlin - Functions

Which of the following is the correct syntax to declare a function add that takes two Int parameters and returns their sum as an Int?

Afun add(a: Int, b: Int): Int { a + b }

Bfun add(a Int, b Int): Int { return a + b }

Cfun add(a: Int, b: Int) -> Int { return a + b }

Dfun add(a: Int, b: Int): Int = a + b

Step-by-Step Solution

Solution:

Step 1: Check parameter declaration syntax
Parameters must be declared as name: Type, so fun add(a Int, b Int): Int { return a + b } is incorrect because it misses colons.
Step 2: Verify return type and function body syntax
fun add(a: Int, b: Int): Int = a + b uses the correct syntax with an expression body and return type. fun add(a: Int, b: Int) -> Int { return a + b } uses '->' which is invalid in Kotlin. fun add(a: Int, b: Int): Int { a + b } misses the return keyword in a block body, so it won't return the sum.
Final Answer:
fun add(a: Int, b: Int): Int = a + b -> Option D
Quick Check:
fun + parameters with colons + : ReturnType + = expression = A [OK]

Quick Trick: Use colons for types and '=' for single-expression functions [OK]

Common Mistakes:

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