"DATA The Revenge"

"DATA The Revenge"

1. How is data entered the computer

   • Throught the devices that are connected to the computer
     • Such as
       • Mouse
       • Keyboard
       • Microphone
       • Scanner
       • Bar Code Reader
       • Optical Pen

2. Types of Data

   • Logic
     • Only take two values
       • True
       • False
     • Represent the choices yes or not for determined conditons
     • Boolean Numbers
   • Numeric
     • Integer Numbers
     • Negative and Positive Numbers
     • Real Numbers
   • Alphanumeric
     • Character Data can contain only one character
     • Combine Numeric, Alphabetic and Special Characters
     • Encased in quotation marks

3. How is Data Processed?

   • Data Entry
     • Is done trought a storage device, the data goes directly to the RAM to wait until is processed
   • Data Processing
     • The processor folows the instructions sent by a program and performs the arithmetic ofr logical operations
   • Output Generation
     • Results are displayed trought an output device

4. How much space does the data takes in the memory

   • The space used depends on the type of data that is being stored
     • Character
       • 1 Byte per Character
     • Byte
       • 1 Byte
     • Short
       • 2 Byte
     • Int
       • 4 Byte
     • Long
       • 8 Byte
     • Float
       • 4 Byte
     • Double
       • 8 Byte
     • Boolean
       • 1 Byte

5. How is data stored in a computer

   • Guidelines for Assigning Names to Variables and Constants
     • Can only contain alphabetic or numeric characters and underscore
     • Start with alphabetic character
     • Are meaningful
     • Shouldnt be longer than 255 characters
   • How to assign a value to Variable or Constant
     • Assignation Number is represented with the left arrow symbol
   • Variable
     • Identifier that represents the symbolic adress of a location in the memory
   • Constant
     • Values that do not change
   • When data is entered, arithmetic and logical operations create result that need to be stored in the RAM

6. Data Classification

   • Numerical
     • Decimal, positive or negative numbers that will be used for arithmetical or logical operations
       • Height and Weight of a person
       • The coefficient equation
       • Miles run by a car
   • Alphanumeric
     • Any combination of letters, numbers and special characters
       • Name
       • SEx
       • Marital Status
       • RFC
       • Address
   • Visual
     • Can listen to or watch
       • Voice
       • Music
       • Graphs
       • Drawings
       • Pictures
       • Video Sequences
   • Physical
     • Can be taken from the enviroment
       • Light intensity in a room
       • A buildings temperature
       • A person blood pressure