computing homework

computing homework

1. computational thinking has 4 key techniques

   • 1) decomposition is breaking down a complex problem or system into smaller parts or more manageable parts.
     • 2) pattern recognition looking for similarities and trends among a problem
       • 3) abstraction is the process of filtering out/ignoring the characteristics of patterns that we dont need in order to concentrate on those that we do.
         • 4) an algorithm is a well defined procedure that allows a computer to solve a problem. another way to describe an algorithm is a sequence of unambiguous instructions.

2. variables and data types

   • 1)the most common data types are: Numeric integer - whole numbers e.g 24,67...
     • 2)character- a single character of alpha numeric data which takes up 1 byte of storage
       • 3) boolean - a variable which can only have one of two values e.g true/false

3. secondary storage

   • secondary storage refers to storage devices and media that are not constantly accessible by a computer system
   • examples include external hard drives,portable, CDs and DVDs

4. CPU/RAM

   • a central processing unit, also called a central proccesor or main processor is the electronic circularity within a computer that carries out instructions of a computer program
   • RAM is the hardware in a computing device where the operating system, application programs and data in current use are kept so they can be quickly reached by the devices processor.

5. network types

   • 1) personal area network (PAN)
   • 2) local area network (LAN)
     • 3) wireless local are network
       • 4) wide area network