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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.