You want to write a Kotlin function that calculates factorial using a local recursive function. Which code correctly implements this?

hard📝 Application Q8 of 15

Kotlin - Functions

Afun factorial(n: Int): Int { val fact = fun(x: Int): Int = if (x <= 1) 1 else x * fact(x - 1) return fact(n) }

Bfun factorial(n: Int): Int { fun fact(x: Int) { if (x <= 1) 1 else x * fact(x - 1) } return fact(n) }

Cfun factorial(n: Int): Int { fun fact(x: Int): Int = if (x <= 1) 1 else x * fact(x - 1) return fact(n) }

Dfun factorial(n: Int): Int { fun fact(x: Int): Int = if (x == 0) 0 else x * fact(x - 1) return fact(n) }

Step-by-Step Solution

Solution:

Step 1: Check recursive local function syntax
fun factorial(n: Int): Int { fun fact(x: Int): Int = if (x <= 1) 1 else x * fact(x - 1) return fact(n) } correctly defines a local function fact with proper recursion and base case (x <= 1 returns 1).
Step 2: Analyze other options
B lacks return type and does not return value from fact. C uses val with recursive call which causes error because fact is not fully defined when called. D has wrong base case returning 0 for 0, which breaks factorial logic.
Final Answer:
fun factorial(n: Int): Int { fun fact(x: Int): Int = if (x <= 1) 1 else x * fact(x - 1) return fact(n) } -> Option C
Quick Check:
Local recursive function = fun factorial(n: Int): Int { fun fact(x: Int): Int = if (x <= 1) 1 else x * fact(x - 1) return fact(n) } [OK]

Quick Trick: Use local functions for recursion inside main function [OK]

Common Mistakes:

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