Data Representation in Computer

How Computers Represent Data

  • All symbols, pictures, or words must be reduced to a string of binary digits.
  • A binary digit is called a bit and represents either a 0 or a 1.
  • These are the only digits in the binary or base 2, number system used by computers.
  • A string of eight bits used to store one number or character in a computer system is called a byte.

One byte for character A 01000001

The computer representation in ASCII for the name Alice is

01000001 = A

01001100 = L

01001001 = I

01000011 = C

01000101 = E

  • To represent the numbers 0 through 9 and the letters a through z and A through Z, computer designers have created coding systems consisting of several hundred standard codes.
  • In one code, for instance, the binary number 01000001 stands for the letter A.
  • Two common coding systems are Extended Binary Coded Decimal Interchange Code (EBCDIC) and American Standard Code for Information Interchange (ASCII).
  • EBCDIC represents every number, alphabetic character, or special character with eight bits, used primarily in IBM and other mainframe computers.
  • ASCII was originally designed as a seven-bit code, but most computers use eight-bit versions.
  • ASCII is used in data transmission, PCs, and some larger computers.
  • The computers store a picture by creating a grid overlay of the picture.
  • Every single point in this grid or matrix is called a pixel (picture element) and consists of a number of bits.

Data Representation

How is a letter converted to binary form and back?

Data Representation in Computer

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