Type conversion is always explicit in Kotlin - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does it mean that type conversion is always explicit in Kotlin?

It means you must manually convert one type to another using specific functions. Kotlin does not convert types automatically for you.

beginner

How do you convert an Int to a Double in Kotlin?

You use the toDouble() function, for example: val d = 5.toDouble().

intermediate

Why does Kotlin require explicit type conversion instead of automatic?

Explicit conversion helps avoid unexpected bugs by making conversions clear and intentional.

beginner

Which function converts a String to an Int in Kotlin?

The function toInt() converts a String to an Int, for example: "123".toInt().

beginner

What happens if you try to assign an Int value directly to a Double variable in Kotlin without conversion?

The code will not compile because Kotlin does not allow implicit type conversion between Int and Double.

In Kotlin, how do you convert a Double to an Int?

A Use <code>toInt()</code> function

B Assign directly without conversion

C Use <code>convertToInt()</code> function

D Use <code>int()</code> function

You must use the toInt() function to explicitly convert a Double to an Int.

What will happen if you write val d: Double = 5 in Kotlin?

A Works fine, automatic conversion happens

B d will be an Int, not Double

C Runtime error

D Compilation error due to missing explicit conversion

Kotlin requires explicit conversion, so you must write val d: Double = 5.toDouble().

Which of these is the correct way to convert a String "100" to Int in Kotlin?

A parseInt("100")

B "100".toInt()

C "100".convertToInt()

D Int("100")

The correct Kotlin function is toInt() called on the String.

Why does Kotlin avoid implicit type conversion?

A Because it is slower

B To make code longer

C To prevent unexpected bugs

D Because Java does it

Explicit conversions make the programmer aware of changes, reducing bugs.

Which function converts an Int to a Long in Kotlin?

A toLong()

B toLongInt()

C convertToLong()

D long()

The function toLong() converts an Int to a Long explicitly.

Explain why Kotlin requires explicit type conversion and give an example converting Int to Double.

Think about how Kotlin treats type safety and how you convert types manually.

Describe what happens if you try to assign an Int value directly to a Double variable without conversion in Kotlin.

Remember Kotlin does not do automatic type changes.