computer science (yr9)

• Variable: A memory location holding data which can change.​

  Constant: A memory location holding data which cannot change.​
• Integer: 3,150,-1700​

  Real/Float: 3.12,17.13​

  Character: A,!,@​

  String: 'yes'​

  Boolean: True/False
• Selection statements involve an if, then, else or case statement.
• Data manipulation is the process of manipulating (creating, arranging, deleting) data points in a given data to get insights much easier. 
• In computer science, a subprogram is a small program that is written within a larger, main program
• Iteration is a process of repeating a block of code in a specified order, until a condition is met or a number of times is reached
• An array is a collection of items of same data type stored at contiguous memory locations.
• Structured Query Language (SQL) is a domain-specific language used to manage data.
• File handling in programming refers to the ability of a program to create, read, write, and manipulate files on a computer's file system.
• Compression: such as WinZip uses an algorithm to resave the data in an existing file, using less space than the original. Sometimes data is lost (lossy) compression and other times the file can be reconstructed whilst maintaining all of the data (lossless) compression.
• Defragmentation, also known as defragging or defrag, is the process of rearranging the data on a storage medium, such as a hard disk drive (HDD), for efficient storage and access.