DATA  REPRESENTATION                                                          

Memory Units:

4 bit = 1 nibble
8 bit = 1 byte
1024 B = 1 KB (Kilo Byte)
1024 KB = 1 MB (Mega Byte)
1024 MB = 1 GB (Giga Byte)
1024 GB = 1 TB (Tera Byte)
1024 TB = 1 PB (Peta Byte)
1024 PB = 1 XB (Exa Byte)
1024 XB = 1 ZB (Zeta Byte)
1024 ZB = 1 YB (Yota Byte)

bit < Byte < KB < MB < GB < TB < PB < XB < ZB < YB

ΓΌ  bit (b)
ΓΌ  Byte (B)
Mbps – mega bits per sec.
MBps – mega Bytes per sec.

·        The information you put into the computer is called Data
·        Information of a computer is stored as Digital Data
·        A number system defines a set of values that is used to represent Quantity
·        In which number system, the modern computers are operated?
Binary Number System

·        Name the most significant bit, which represent 1 and 0 for a positive number and negative number, respectively.
Sign Bit
·        Which coding scheme represents data in a binary form in the computer system? ASCII, EBCDIC and Unicode are the most commonly used codes under this scheme.
Binary Coding Scheme

·        EBCDIC is a 8-Bit code with 256 different representations of characters. It is mainly used in mainframe computers.
·        EBCDIC stands for Extended Binary Coded Decimal Interchange Code
·        In the Hexadecimal Number System each number represents a power of 16. To represent the decimal numbers, this system uses numbers from 0 to 9 and characters from A to F to represent numbers 10-15, respectively. It is commonly used as a shortcut notation for groups of four binary digits
·        BCD is a method that represents the decimal digits with the help of binary digits. It takes advantage that one decimal numeral can be represented by 4-bit pattern. BCD stands for Binary Coded Decimal
·        This coding system is used to represent the interval storage area of the computers. In this system, every character is represented by a combination of bits. Binary Coding System
·        The Base or Radix of the decimal number system is 10
·        The arithmetic operations (addition, subtraction, multiplication and division) performed on the binary numbers is called Binary Arithmetic
·        What is the standard code the computer industry created to represent characters? American Standard Code for Information Interchange (ASCII)
·        ASCII is a code used for standardizing the storage and transfer of information amongst various computing devices.
·        It is required for representing more than 64 characters. At present, the mostly used coding systems are ASCII and EBCDIC
·        Which code is also known as Reflected Code? Gray Code
·        The 7-bit ASCII code is widely used for Two (0 or 1)
·        In the binary language, each letter of the alphabet, each number and each special character is made up of a unique combination of Eight Bits.