Try-catch as an expression in Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to assign the result of the try block to the variable.

Kotlin

val result = try { 10 / 2 } catch (e: Exception) { 0 }

Drag options to blanks, or click blank then click option'

A(

B{

C[

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of curly braces for the try block.

Forgetting to open the try block with a brace.

The try block must start with a curly brace { to define the block of code.

2fill in blank

medium

Complete the code to catch an exception and return -1.

Kotlin

val result = try { 10 / 0 } catch ([1]: Exception) { -1 }

Drag options to blanks, or click blank then click option'

Ae

Berror

Cex

Dexception

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the variable name in the catch block.

Using invalid variable names.

The variable name for the caught exception is commonly e, but any valid identifier works. Here, e is used.

3fill in blank

hard

Fix the error in the try-catch expression to avoid throwing an exception.

Kotlin

val result = try { 10 / [1] } catch (e: Exception) { 0 }

Drag options to blanks, or click blank then click option'

A0

B1

Cnull

D2

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero as divisor causing ArithmeticException.

Using null which is not valid for division.

Dividing by zero causes an exception. Using 2 avoids the exception and returns 5.

4fill in blank

hard

Complete the code to create a try-catch expression that returns the length of a string or -1 if null.

Kotlin

val length = try { input!!.length } catch (e: [1]) { -1 }

Drag options to blanks, or click blank then click option'

A{

BNullPointerException

CException

D(

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of braces for try block.

Catching the wrong exception type.

The try block must start with { and catch the NullPointerException to handle null input safely.

5fill in blank

hard

Fill both blanks to create a try-catch expression that returns the uppercase string or "ERROR" if exception occurs.

Kotlin

val output = try { input.toUpperCase() } catch (e: [1]) { [2] }

Drag options to blanks, or click blank then click option'

A{

BException

C"ERROR"

D(

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of braces for try block.

Returning a variable instead of a string literal on error.

The try block starts with {, catches Exception, and returns the string "ERROR" on failure.