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CodeHS Practice Problems

Get familiar with coding using our Practice Problems.

Languages

Java

Javascript

Python

C++

SQL

Java
Practice Problems

Basics

LEVEL 1

Area of a Circle w/ Radius

Square a Double Type

Cube of a Number

Weight of a Car Carrier Trailer

Purchase Calculator

Address Number Combinations

Area of a Triangle

Print a Greeting

Cupcake Calculator

Sum of Two Numbers

Sum of Even Numbers

Strings

LEVEL 1

Add Three Strings

Screaming

Double Phrase

Lowercase

Find the Key

Find the Key, Part 2

Salutation

**emphasize**

Combine Two Strings

Bake the Cake Name!

Reverse a String

Count Successful Free Throws

Math

LEVEL 1

Sum Numbers

Product Range

Average

Area of a Circle w/ Diameter

Area of a Trapezoid

Celsius to Fahrenheit

Shooting Percentage

Find Product

Basic Math Operation

Spring Tulips

Sum of Two Numbers

Booleans

LEVEL 1

Is Divisible

At Capacity

Heart Rate

Enough Paint

Sum Evens

Nums in Order

isEven

Password Length

Can we Make it?

Boolean Check

Soccer Goal Check

Simple Calculator

Check Even or Odd

Check Movie Eligibility

Early Dismissal Check

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LEVEL 1

Array First Element

Array Last Element

Array Middle Element

Password Mask

Countdown Timer

Creating an Array

Initializing an Array

Array Sum

Array Multiply

Find Min Value

Sum of Array Elements

Coin Counter

Count Vowels in a String

Total Bases Calculator for At Bats

Sum of Array Elements

2D Array

LEVEL 1

Sum All

isSquare

Multiplication Table

Value in Row

Max Value

2D Array Creator

Checkers

Sum a 2D Array

ArrayLists

LEVEL 1

ArrayList First Element

ArrayList Last Element

ArrayList Middle Element

Initializing an ArrayList

ArrayList Sum

ArrayList Multiply

Java: Sum of ArrayList Elements

Basic ArrayList Operations

ArrayList Basics

Finding the Maximum in an ArrayList

Strings

LEVEL 2

Make even

Like Totally Awesome

Replace Meat

Find the Second Instance

A or An?

Switch the Words

Reverse the String

Just First and Last

String Manipulation

Soccer Player Initials

Reverse a String

Math

LEVEL 2

Repeat Last 2 Characters

Digit of Square Root of 2

Effective Field Goal Percentage

True Shooting Percentage

Payday

Monthly Pay

Factorial Calculation

Weight Conversion: Ounces to Pounds

Calculate the Area of a Circle

Booleans

LEVEL 2

Tax Rate

Lucky 13

Enough Paint 2

Multiple A's

Contains Vowels

How Tired Am I?

Construction Site Safety Check

Theme Park Ride Eligibility

Boolean Expression Evaluation

Arrays

LEVEL 2

Array Max

Array Min

Array Average

Reverse Array

Array Swap First Last

Array Repeat

Array Search

Alien Signal Strength Detector

2D Array

LEVEL 2

Invert Array

Reverse

Split

Team +/-

Magic Square

Consecutive Values

Find Maximum

Weekly Weather Report

Sum of Row Elements

ArrayLists

LEVEL 2

ArrayList Max

ArrayList Min

Reverse ArrayList

ArrayList Swap First Last

ArrayList Repeat

ArrayList Element Repeat

ArrayList Search

Basketball Team's Highest Scorer

Filtering Even Numbers

Movie Night Genre Counter

Adding and Accessing Elements

Recursion

Reverse String

Binary Search

Greatest Common Divisor

Least Common Multiple

Recurring Letters

Sum

Sum of Array Using Recursion

Magic Mirror Word Reverser

Recursive Factorial Calculation

String

More Karel Letters

Valid Password

How many Dogs?

Replace All Plates

Count Your Spaces

Start with a Capital

Even Up, Odd Down

Strings

LEVEL 3

Fix the Bad Apples

Replace Like

Split the String

Double a Word

Finding a Word

Palindrome Checker

Reversing a String

Initials

Nickname Maker

Reverse a String

Objects

LEVEL 1

Getting the Width

Update the Circle

Area of a Triangle

Max Student

Create a Room

Increase the Radius

Cake Class

Pet Object Printer

Creating a Simple Object in Java

Objects

LEVEL 2

Create a Class

Only Blue

Turtles are Pets Too!

Animal Sounds

Test average

Words

Car Speed Tracker

Creating a Simple Car Object

Arrays

LEVEL 3

Shift Elements to the Left

Compute Mode

All Cats

Consecutive Pairs

Duplicates

Count Evens

Longest Bird Name

ArrayLists

LEVEL 3

Average Value

Shift Elements to the Right

Compute Mode

All Dogs

Consecutive Pairs

Duplicates

Count Odd

Longest Bird Name with ArrayLists

CodeHS Practice FAQ

Still have questions? We’re happy to answer them, just reach out to [email protected] !

What is a CodeHS Practice problem?

CodeHS Practice is a curated list of practice problems to help students gain a stronger understanding of basic programming skills. Each Practice problem is autograded meaning students' code will be run through a series of Test Cases to ensure that their code is functionally and stylistically sound, and accomplished the goals of a given exercise.

Who can access CodeHS Practice problems?

Anyone can access the CodeHS Practice problems for free—no CodeHS account required! Simply go to codehs.com/practice and start coding. Note: If you want to track progress, you’ll need to create a CodeHS account.

What programming languages are available?

CodeHS Practice has the most robust coding problems in a variety of programming languages including:

* JavaScript

* Java

* Python

* C++

* SQL

What are the different types of practice problems?

We offer two types of practice problems.

Coding Practice - Students write code for a single method or function that should match the expected output.

Parsons Problems - Students drag the lines of code into the correct order to match the expected output.

What do the status colors mean?

Grey/Unopened - the student has not yet opened the activity
Yellow/Started - the student has opened and worked on the activity, but has not completed it
Green/Completed - the student has completed the exercise

What do the points mean?

The point value for each problem indicates the difficulty level. (1 = easy; 10 = difficult). You can see the points by hovering over the dot next to the exercise.

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