CS3: Fundamentals Of Data Representation
No description yet. This curated deck is ready for daily study.
Card preview (8)
What is the difference between Denary, Binary & Hexadecimal?
+ Denary [Base 10]: The standard English number system + Binary [Base 2]: The number system used in computers + Hexadecimal [Base 16]: A number system used to abbreviate Binary code in a computer system
Why is Hexadecimal often used in programming?
+ It is easier to memorise for programmers + It is easier to read + Can be used to represent specific colour shades
What are the ways Quantities of Binary code can be represented?
+ As a single binary digit : A BIT + As a group of four bits : A NIBBLE + As a group of eight bits : A BYTE + As a group of 1000 bytes : A KILOBYTE + As a group of 1000 kilobytes : A MEGABYTE + As a group of 1000 megabytes : A GIGABYTE + As a group of 1000 gigabytes : A TERABYTE
How do you add Binary Numbers?
+ 0 + 0 = 0 + 1 + 0 = 1 + 1 + 1 = 10 10110110 01011101 ———— 0001 0001 0011
What is a Binary shift?
+ A binary shift is when you move all the digits in a binary sequence to the left or right > Shifting the digits to the left multiplies the number (in denary) by two > Shifting the digits to the left divides the number (in denary) by two
What is a character set?
+ A character set is used to represent all of the possible characters in a system + There are two character sets… > 7-Bit ASCII > Unicode
What is the difference between Unicode & ASCII?
+ ASCII is a way of representing all the characters of the English language, including numbers & special symbols > Each character in ASCII is represented by 7 bits of binary code + Unicode is a way of representing all characters in all languages. This is for languages with other thousands of characters, such as the Arabian language & Japanese Kanji > Each character in Unicode is represented by 2 bytes (16 bits) of binary code + The first 127 digits of ASCII are the same as the first 127 digits of Unicode
What is a pixel?
A pixel is a single square of colour in a bitmap image