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Logic Truth Table Practice

Practice filling out truth tables for boolean expressions built from AND, OR, and NOT, with randomly generated problems and instant row-by-row feedback.

Networking Subnetting Practice Problems

Learn the manual method for IPv4 subnetting, then practice with randomly generated problems across five difficulty levels and instant feedback.

Networking VLSM Practice Problems

Practice Variable Length Subnet Masking: allocate a network into differently-sized subnets based on host requirements, then check your network, broadcast, usable range, and CIDR for each one.

Number Systems Number Base Conversion Practice

Practice converting numbers between binary, octal, decimal, and hexadecimal. Pick which two bases to convert between, then check your work with a full step-by-step explanation.

Java Java Math.random()

Are you working on Math.random() in your Java programming class? Here's an explanation and some practice problems to help you get better.

Java Java Array Algorithms

A roadmap to the core array algorithms every Java student should know, from finding a minimum or maximum to searching for a value.