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Operating Systems and Using Linux. Topics Review Number Systems. Go over Homework 1 Solution. CSHC Hours of Operations. What is an Operating System?. The Number System. Position Number System The same digits have different meaning depending on their position in the numeral.

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operating systems and using linux
Operating Systems and Using Linux

Topics

  • Review Number Systems.
  • Go over Homework 1 Solution.
  • CSHC Hours of Operations.
  • What is an Operating System?
the number system
The Number System

Position Number System

  • The same digits have different meaning depending on their position in the numeral.
  • The value of a digit depends on the digit itself of its position.
  • Binary, decimal, hexadecimal are all position number system.
the number system con t
The Number System (con’t)
  • Example: 4410
  • 101 100
  • 4 4
  • ------------
  • 4 x 10 + 4 = 4410
the number system con t1
The Number System (con’t)

BinaryDecimalHexadecimalBinaryDecimalHexadecimal

0 0 0 1010 10 A

1 1 1 1011 11 B

10 2 2 1100 12 C

11 3 3 1101 13 D

100 4 4 1110 14 E

101 5 5 1111 15 F

110 6 6

111 7 7

1000 8 8

1001 9 9

converting from hexadecimal to decimal
Converting From Hexadecimal to Decimal
  • Example: Convert 1A5F16 to decimal.
  • 1A5F
  • 163 162 161 160
  • 4096 256 16 1
  • Recall: A16 = 1010 and F16 = 1510.
  • = 1 x 4096 + A x 256 + 5 x 16 + F x 1
  • = 1 x 4096 + 10 x 256 + 5 x 16 + 15 x 1
  • = 4096 + 2560 + 80 + 15
  • = 675110
converting from decimal to hexadeciaml
Converting From Decimal to Hexadeciaml
  • Perform successive divisions by 16, placing the remainder (0-9, A-F) in each of the positions from right to left.
  • Continue until the quotient is zero.
  • Example: Convert 14310 to hex.
  • 143 / 16 = 8 rem = 1510 = F16
  • 8 / 16 = 0 rem = 8
  • Done answer = 8F16
  • To Check: 8 x 16 + 15 = 128 + 15 = 14310
example of equivalent numbers
Example of Equivalent Numbers
  • Binary: 1 0 1 0 0 0 0 1 0 1 0 0 1 1 12
  • Decimal: 2064710
  • Hexadecimal: 50A716
  • Notice that the number of digits needed is smaller as the base increases.
homwork solution 1
Homwork Solution 1

Go over homework solution 1!

operating systems and using linux1
Operating Systems and Using Linux

Topics

  • What is an Operating System?
computer science help desk
Computer Science Help Desk
  • CSHC (Computer Science Help Center) is staffed by student tutors.
    • Help with homework and projects.
    • Text editors and Linux questions.
    • ECS 332A – Hours of Operations:
      • Monday – Thursday 12 - 8 PM
      • Friday 12 – 4 PM
what is an operating system os
What is an Operating System (OS)?
  • A computer program
  • Performs many operations, such as:
    • Allows you to communicate with the computer (tell it what to do)
    • Controls access (login) to the computer
    • Keeps track of all processes currently running
  • At this point, your main concern is how to communicate with the computer using the OS.
how do i communicate with the computer using the os
How Do I Communicate With the Computer Using the OS?
  • You communicate using the particular OS’s
  • user interface.
    • Graphical User Interface (GUI) - Windows
    • Command-driven interface - DOS, UNIX,
    • Linux
  • We will be using the Linux operating system,
  • which is very similar to UNIX.
how do i communicate with the computer using the os con t
How Do I Communicate With the Computer Using the OS? (con’t)
  • When you log in to the Linux system here, a user
  • prompt will be displayed:
  • linux#[1]% _
    • where # is the number of the Linux server that you have connected to. You may use any of the Linux servers.
  • The number in the brackets will change as you work. It is
  • the “number” of the command that you are about to type.
  • If this prompt is not on the screen at any time, you are not communicating with the OS.
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