BINARY
Which of these is a valid byte? Check all that apply.
Great job! A byte is composed of eight bits of zeros and ones.
How many possible values can we have with 8 bits?
Great job! Bits use the binary system, which is also known as the base-2 numeral system. So 2^8 allows us 256 values from 0 to 255.
Why did UTF-8 replace the ASCII character-encoding standard?
Wohoo! UTF-8 replaced the ASCII character-encoding standard because it can store a character in more than a single byte. This allowed us to represent a lot more character types, like emoji.
What is the highest decimal value we can represent with a byte?
Explanation! There are 256 values in a byte, from the decimal number 0 to 255.
The binary value of the ASCII letter "c" is 0110 0011. Using the handy chart that we learned in the lesson, convert this number to its decimal value. You)ll need to use some math for this question.
Great job! The decimal value 99 is same as the binary value 0110 0011. So the numbers that are turned ON are 64, 32, 2, and 1 and added up together. In other words, 64 + 32 + 2 + 1 = 99.
What cards had holes in them that were historically used to store data?
Great job! Punch cards were the first binary system used for machines.
A(n) ____ is a series of steps that solve specific problems.
Right on! Algorithms are a series of steps that solve specific problems.
What are the three main desktop operating systems used today? Check all that apply.
Nice work! The main desktop operating systems in use today are Windows, Macintosh, and Linux.
What is software called when it can be freely distributed, modified, and shared?
Yep, commercial software is paid for, while open-source software can be freely distributed, modified, and shared.
What does the following binary code translate to? Tip: Use an ASCII "character to binary" chart to help you find an answer. 01101000 01100101 01101100 01101100 01101111
In punch card systems, a hole represents the number ____.
You nailed it! We use the number 1 to represent a hole in a punch card.
Ready to test your recall?
Which of these is a valid byte? Check all that apply.
How confident are you in this answer?