Chapter 2 : 2.1.2 Data Representation 2017/2018 Faizah Ma'arof

1. At the end of this topic, students
should be able to:
explain data representation in
computer
a)
1
Computer System
2.1.2 Data Representation
Chapter
PDT - 2017/2018

2. Data Representation
How does a computer represent data?
❑ By using two unique binary digits 1 and 0 to
represent the two states on and off.
❑ A computer circuit represents the 0 or the 1
electronically by the presence or absence of
an electrical charge
computer recognizes only two discrete
electrical states (on and off)
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3. Data Representation
Bit
▪ Is the smallest unit of data the computer can
process.
▪ (Short for binary digit )
▪ The number system has two unique digits, 1 (on)
or 0 (Off)
▪ Represents an electrical state (on or off)
Byte
▪ A group of 8 bits (ex:11110000)
▪ Represents a single character such as a digit,
a letter, a punctuation mark or any symbol in
computer 3

4. Data Representation
• ASCII (American
Standard Code for
Information
Interchange) is the
most widely used
coding scheme to
represent data
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5. Data Representation
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