Programming Fundamentals lecture 1

Programming
Fundamentals
REHAN IJAZ
By

Computer hardware refers to the physical parts or components of a computer
such as monitor, keyboard, Computer data storage, hard drive disk, mouse,
printers, CPU (graphic cards, sound cards, memory, motherboard and chips),

Computer software, or just software, is any set of machine-readable
instructions (most often in the form of a computer program) that
directs a computer's processor to perform specific operations.

 Coined 1953 by Paul Niquette
 First used in print by John Tukey in1958
JOHN TUKEY
Born
(1915-06-16)June 16, 1915 New Bedford,
Massachusetts, USA
Fields Mathematician
Institutions Bell Labs, Princeton University
Known for Coining the term 'bit'

System softwares Application softwares

 Microsoft employee is called "Softie".
 Average salary for a developer coming in at 1,11,30,000.
 Microsoft currently employs 88,180 people
 Pakistan's IT industry's global share is estimated at US$2.8 billion.
 Pakistan Software Export Board is national public sector
organization dealing with Software/software houses
 PASHA –Pakistan Software House Association

 An operating system (OS) is a collection of software
 Manages computer hardware resources and provides
common services for computer programs.
 Application programs usually require an operating
system to function.
 Acts as an intermediary between programs and the
computer hardware.

 In a multitasking operating system where multiple programs can be
running at the same time, the operating system determines which
applications should run in what order and how much time should be
allowed for each application before giving another application a turn.
 It handles input and output to and from attached hardware devices, such
as hard disks, printers, and dial-up ports.
 On computers that can provide parallel processing, an operating system
can manage how to divide the program so that it runs on more than one
processor at a time.

 A compiler is a computer program (or a set of programs) that transforms source
code written in a programming language (the source language) into another
computer language (the target language), with the latter often having a binary
form known as object code. If you create any error in code then output not found
or get error message.
 The first compiler was developed by Grace Hopper while working on the Harvard
Mark I computer.

GRACE HOPPER
Born
December 9, 1906
New York City, New York, U.S.
Rank
U.S. Chief Technology Officer , (Rear
admiral (lower half)) US Navy
Known for Coining the term compiler

 An interpreter is a computer program that directly executes, i.e.
performs, instructions written in a programming or scripting language,
without previously compiling them into a machine language program.

No Compiler Interpreter
1 Compiler Takes Entire program as input Interpreter Takes Single instruction as
input .
2 Conditional Control Statements are Executes
faster
Conditional Control Statements are
Executes slower
3 Memory Requirement : More (Since Object
Code is Generated)
Memory Requirement is Less
4 Program need not be compiled every time Every time higher level program is
converted into lower level program
5 Errors are displayed after entire program is
checked
Errors are displayed for every instruction
interpreted (if any)
6 Example : C Compiler Example : BASIC

 Sometimes called text editor, a program that enables you to create and edit text files.
There are many different types of editors, but they all fall into two general categories:
 The distinction between editors and word processors is not clear-cut, but in general,
word processors provide many more formatting features. Nowadays, the term editor
usually refers to source code editors that include many special features for writing and
editing source code.

 The source code consists of the programming statements that are
created by a programmer with a text editor or a visual programming
tool and then saved in a file. For example, a programmer using the C
language types in a desired sequence of C language statements using
a text editor and then saves them as a named file. This file is said to
contain the source code.

# include <stdio.h>
int main ()
{
printf (“ Am I Dr. AQ Khan or politician?”);
return 0;
}

 Source code is compiled with a C compiler and the resulting output,
the compiled file, is often referred to as object code. The object code
file contains a sequence of instructions that the processor can
understand but that is difficult for a human to read or modify.

# include <stdio.h>
int main ()
{
Printf (“ Am I Dr. AQ Khan or politician?”);
Return ();
}
Compiler
10101010111111010101011000
01010100101001010010111010
10101011010111010101010101
01010101010010101010101001
01001010010101011100001010
00000001111111100000101100
10101010010100101011111010
1110110
Source Code Object Code

Programming Fundamentals lecture 1

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Programming Fundamentals lecture 1