Introduction to PC
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Transcript of Introduction to PC
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1
EN MOHD HATTA BIN HJ MOHAMED ALI
1. Deitel (2007) . “C How To Program.” Pearson
2. Adrian & Kathie Kingsley Hughes
(2005) “Beginning Programming”. Wiley
Publishing, Inc.
3. from Wikipedia website, free
encyclopedia.
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The Computer
1.1
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What Is Computer?
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• An electronic device, operating under the control of
instructions stored in its own memory
• Two major components
Computer
Hardware Software
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Why Program?
Computer – programmable machine designed to follow
instructions
Program – instructions in computer memory to make it do
something
Programmer – person who writes instructions (programs)
to make computer perform a task
SO, without programmers, no programs; without programs,
a computer cannot do anything
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Computer System: The Hardware
1.2
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Types of Computer
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Computer’s Component
Main Component (Hardware) of computer;
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Computer’s Component (cont…)
• The architecture of a typical computer, usually consists of;
System Unit (CPU) power of the computers. Consist of ALU and control unit.
Main Memory (RAM & ROM) stores information to be processed or instructions on how to process
information.+ 2nd Storage (mass storage - tapes, optical discs, magnetic disc, etc.)
Peripherals devices 2 types;
1. Input Devices – keyboards, mouse, laser pointer, digital pen, etc.
2. Output Devices – monitors, LCD screen, printers, speakers, etc.
Communication Devices Enables a computer to send and receive data, instructions, and information
Note:
Some references books show the basic components of typical computer system is CPU,
Main memory, secondary memory/storage devices, input devices and output devices.
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Computer Architecture
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• The Organization of CPU
Instruction
(Input)
Result
(Output)
CPU
ALU – Arithmetic
Logic Unit
Control
Unit
Input Devices
Communication
devices
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Computer Architecture (cont…)
• Comprised of:
• Control Unit • Retrieves and decodes program instructions
• Coordinates activities of all other parts of computer
• Arithmetic & Logic Unit • Hardware optimized for high-speed numeric calculation
• Hardware designed for true/false, yes/no decisions
System Unit (CPU)
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Computer Architecture (cont…)
Main Memory
• It is volatile. Main memory is erased when program
terminates or computer is turned off
• Also called Random Access Memory (RAM)
• Organized as follows:
• bit: smallest piece of memory. Has values 0 (off,
false) or 1 (on, true)
• byte: 8 consecutive bits. Bytes have addresses.
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Computer Architecture (cont…)
Main Memory
• Addresses – Each byte in memory is identified by a
unique number known as an address.
In Figure 1-3, the number 149 is stored in the byte with the address 16, and
the number 72 is stored at address 23.
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Computer Architecture (cont…)
Secondary storage
• Non-volatile: data retained when program is not
running or computer is turned off
• Comes in a variety of media:
• magnetic: floppy disk, zip disk, hard drive
• optical: CD-ROM
• Flash drives, connected to the USB port
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Computer Architecture (cont…)
Input devices
• Devices that send information to the computer from
outside
• Many devices can provide input:
• Keyboard, mouse, scanner, digital camera,
microphone
• Disk drives and CD-ROM
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Computer Architecture (cont…)
Output devices
• Output is information sent from a computer program
to the outside world.
• The output is sent to an output device
• Many devices can be used for output:
• Computer monitor and printer
• Floppy, zip disk drives
• Writable CD drives
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Computer System: The Software
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Computer Software
• Software is divided into 2 categories
Software
System
Software
Application
Software
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Computer Software (Cont..)
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•Normally supplied by the
manufacturer of the computer
•Consists of utility programs and
operating aids that facilitate the
use and performance of the
computer
•Includes the computer’s
operating system
•Related software that manages
the system’s resources and
control the operations of the
hardware.
•Designed to perform a specific
task such as course registration
or banking and a general-
purpose such as processor (eg.
Ms Word)
•May be acquired by purchasing
off-the-shelf or by designing for
own purpose (customer made)
•Off-the-shelf : prewritten and
ready to use
•Custom made : written by in-
house, consulting firm or
software house
SYSTEM SOFTWARE APPLICATION SOFTWARE
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Computer Software (Cont..)
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Where are the application and system software?
System Software • operating system
• manage and control by
machine language
• eg. i-Mac, windows,
Unix, Linux,machine lang.
Application Software • users can directly understand
and use the software.
• communicate in human
language
• eg. Micr. Office, notepad, prog.
lang. such C, C++, VB, etc.
Interpreter • use to interpret high-
level language to low level
lang. and so on.
• user will communicate
with system easily.
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Programs & Programming Languages
• A program is a set of instructions that the computer
follows to perform a task
• We start with an algorithm, which is a set of well-defined
steps.
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Example Algorithm for
Calculating Gross Pay
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Machine Language
• Although the previous algorithm defines the steps for
calculating the gross pay, it is not ready to be executed
on the computer.
• The computer only executes machine language
instructions.
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Machine Language
• Machine language instructions are binary numbers, such
as
1011010000000101
• Rather than writing programs in machine language,
programmers use programming languages.
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Programs and
Programming Languages
• Types of languages:
• Low-level: used for communication with computer hardware directly. Often written in binary machine code (0’s/1’s) directly.
• High-level: closer to human language
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Some Well-Known Programming
Languages
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From a High-level Program to an
Executable File
1. Create file containing the program with a text editor.
2. Run preprocessor to convert source file directives to source code program statements.
3. Run compiler to convert source program into machine instructions.
4. Run linker to connect hardware-specific code to machine instructions, producing an executable file.
• Steps 1 - 4 are often performed by a single command or button click.
• Errors detected at any step will prevent execution of following steps.
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From a High-level Program to an
Executable File
Source Code
Preprocessor
Modified Source Code
Compiler
Object Code
Linker
Executable Code
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Integrated Development
Environments (IDEs)
• An integrated development environment, or IDE,
combine all the tools needed to write, compile, and
debug a program into a single software application.
• Examples are Microsoft Visual C++, Borland C++
Builder, CodeWarrior, etc.
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Integrated Development
Environments (IDEs)
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What Is a Program Made Of?
1.4
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What Is a Program Made Of?
• Common elements in programming languages:
• Key Words
• Programmer-Defined Identifiers
• Operators
• Punctuation
• Syntax
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Program 1-1
1 // This program calculates the user's pay. 2 #include <iostream> 3 using namespace std; 4 5 int main() 6 { 7 double hours, rate, pay; 8 9 // Get the number of hours worked. 10 cout << "How many hours did you work? "; 11 cin >> hours; 12 13 // Get the hourly pay rate. 14 cout << "How much do you get paid per hour?"; 15 cin >> rate; 16 17 // Calculate the pay. 18 pay = hours * rate; 19 20 // Display the pay. 21 cout << "You have earned $" << pay << endl; 22 return 0; 23 }
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Key Words
• Also known as reserved words
• Have a special meaning in C++
• Can not be used for any other purpose
• Key words in the Program 1-1: using,
namespace, int, main, double, and return.
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1 // This program calculates the user's pay. 2 #include <iostream> 3 using namespace std; 4 5 int main() 6 { 7 double hours, rate, pay; 8 9 // Get the number of hours worked. 10 cout << "How many hours did you work? "; 11 cin >> hours; 12 13 // Get the hourly pay rate. 14 cout << "How much do you get paid per hour? "; 15 cin >> rate; 16 17 // Calculate the pay. 18 pay = hours * rate; 19 20 // Display the pay. 21 cout << "You have earned $" << pay << endl; 22 return 0; 23 }
Key Words
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Programmer-Defined Identifiers
• Names made up by the programmer
• Not part of the C++ language
• Used to represent various things: variables
(memory locations), functions, etc.
• In Program 1-1: hours, rate, and pay.
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1 // This program calculates the user's pay. 2 #include <iostream> 3 using namespace std; 4 5 int main() 6 { 7 double hours, rate, pay; 8 9 // Get the number of hours worked. 10 cout << "How many hours did you work? "; 11 cin >> hours; 12 13 // Get the hourly pay rate. 14 cout << "How much do you get paid per hour? "; 15 cin >> rate; 16 17 // Calculate the pay. 18 pay = hours * rate; 19 20 // Display the pay. 21 cout << "You have earned $" << pay << endl; 22 return 0; 23 }
Programmer-Defined Identifiers
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Operators
• Used to perform operations on data
• Many types of operators:
• Arithmetic - ex: +,-,*,/
• Assignment – ex: =
• Some operators in Program1-1: << >> = *
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Operators
1 // This program calculates the user's pay. 2 #include <iostream> 3 using namespace std; 4 5 int main() 6 { 7 double hours, rate, pay; 8 9 // Get the number of hours worked. 10 cout << "How many hours did you work? "; 11 cin >> hours; 12 13 // Get the hourly pay rate. 14 cout << "How much do you get paid per hour? "; 15 cin >> rate; 16 17 // Calculate the pay. 18 pay = hours * rate; 19 20 // Display the pay. 21 cout << "You have earned $" << pay << endl; 22 return 0; 23 }
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Punctuation
• Characters that mark the end of a statement, or
that separate items in a list
• In Program 1-1: , and ;
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1 // This program calculates the user's pay. 2 #include <iostream> 3 using namespace std; 4 5 int main() 6 { 7 double hours, rate, pay; 8 9 // Get the number of hours worked. 10 cout << "How many hours did you work? "; 11 cin >> hours; 12 13 // Get the hourly pay rate. 14 cout << "How much do you get paid per hour? "; 15 cin >> rate; 16 17 // Calculate the pay. 18 pay = hours * rate; 19 20 // Display the pay. 21 cout << "You have earned $" << pay << endl; 22 return 0; 23 }
Punctuation
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Syntax
• The rules of grammar that must be followed
when writing a program
• Controls the use of key words, operators,
programmer-defined symbols, and punctuation
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Variables
• A variable is a named storage location in the computer’s memory for holding a piece of data.
• In Program 1-1 we used three variables:
• The hours variable was used to hold the hours worked
• The rate variable was used to hold the pay rate
• The pay variable was used to hold the gross pay
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Variable Definitions
• To create a variable in a program you must write a
variable definition (also called a variable declaration)
• Here is the statement from Program 1-1 that defines
the variables:
double hours, rate, pay;
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Variable Definitions
• There are many different types of data, which you will learn about in this course.
• A variable holds a specific type of data.
• The variable definition specifies the type of data a variable can hold, and the variable name.
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Variable Definitions
• Once again, line 7 from Program 1-1:
double hours, rate, pay;
• The word double specifies that the variables can
hold double-precision floating point numbers. (You
will learn more about that in Chapter 2)
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Input, Processing, and Output
1.5
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Input, Processing, and Output
Three steps that a program typically performs:
1) Gather input data: from keyboard
from files on disk drives
2) Process the input data
3) Display the results as output: send it to the screen
write to a file
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The Programming Process
1.6
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The Programming Process
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Procedural and
Object-Oriented Programming
1.7
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Procedural and Object-Oriented
Programming
Procedural programming: focus is on the
process. Procedures/functions are written
to process data.
Object-Oriented programming: focus is on
objects, which contain data and the means
to manipulate the data. Messages sent to
objects to perform operations.
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Exercise & Quiz
1.8
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Exercise
Lab Exercise
FKAAS. “Programming Technique 1.”
Part A -
Part B -
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Quiz 1
Page 23
Tony Gaddish & Barret Krupnow. “Starting Out with
C++, 5th Edition.” Pearson International Edition.
Part A - Short Question
1, 2, 3, 4, 5
Part B - Fill the Blank Question
8, 9, 10, 11, 12, 13, 14, 15, 16, 17
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Quiz 1 (cont..)
1. Both main memory and secondary storage are types of memory.
Describe the differences of them.
2. What is the difference between operating system software and
application software.
3. Indicate all categories that following operating system belong to;
• System A : This system allow multiple users to run multiple
programs simultaneously.
• System B : Only one user may access the system at a time,
but multiple programs can be run simultaneously.
• System C : Only one user may access the system at a time,
and only one program can be run on the system at a time.
4. Why must programs written in a high-level language be translated
into machine language before It can be run.
5. Why it easier to write a program in a high level language than in
machine language.
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Quiz 1 (cont..)
1. Computers can do many different job because they can be ________.
2. The job of the __________ is to fetch instruction, carry out the
operations commanded by the instructions, and produce some
outcome or resultant information.
3. Internally, the CPU consist of the __________ and the ___________.
4. A(n)_________is an example of a secondary storage device.
5. The two general categories of software are _________and ________.
6. A program is a set of ______________.
7. Since computer can’t programmed in natural human language,
algorithm must be written in a(n) ____________ language.
8. __________ is the only language computer really process.
9. __________ language are close to the level of human in terms of
readability.
10. __________ language are close to the level of the computer.