Which data type holds only the values true or false?
AnswerBoolean
Booleans, named after mathematician George Boole, hold true or false.
Coding · Facts & stats
Code Challenges facts & stats
7 fact-checked facts about coding and programming, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
How many bits are in a byte?
Answer8
A byte is made up of 8 bits.
Going deeper
What does API stand for?
AnswerApplication Programming Interface
An API is a defined way for programs to request services or data from each other.
In C, Java and Python, what is the index of the first element of an array or list?
Answer0
These languages use zero-based indexing, so the first element is at index 0.
Who is often called the first computer programmer?
AnswerAda Lovelace
Ada Lovelace wrote an algorithm for Charles Babbage's proposed Analytical Engine in the 1840s.
Expert level
What is the hexadecimal value FF in decimal?
Answer255
FF is 15 × 16 + 15 = 255.
Which sorting algorithm repeatedly swaps neighboring items that are out of order?
AnswerBubble sort
Bubble sort passes through the list swapping adjacent pairs until no swaps are needed.
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