Data structures

• A data structure is a temporary structure which are held in main memory that hold multiple data items while a program is running.
• Array

  An ordered arrangement of data items with the same data type. The are accessed by referencing their arrangement in the array. A two dimensional array is arrays within arrays.
• An array is a series of memory locations each of which hold a single item of data, but with each box sharing the same name. All data in an array must be the same data type. All arrays start at position zero.
• Record

  A data structure that allows us to group together data of different data types. Each item in a record is called a field. Each field has its own data type.
• Parameter


  A piece of data that we can pass into a subroutine when it's called. This allows us to give the subroutine specific data which then can be used within the subroutine.