The document provides an overview of procedural programming, emphasizing its structure of organizing code into reusable procedures and its importance in programming education and critical systems. It also explains the basic concepts of computer hardware and software, detailing types of computers, applications, internet basics, and problem-solving methodologies using algorithms. Additionally, it includes a sample C program that calculates the factorial of a number, demonstrating the structure of a C program.

1. Procedural Programming
By
G. Lakshmana Rao
Assistant Professor
Computer Science and Engineering

2. What is Procedural Programming?
• Procedural Programming may be the
first programming paradigm that a new
developer will learn.
• The ​
​
​
procedural programming paradigm
structures code into a series of procedure calls
or routines, breaking down tasks into reusable,
self-contained blocks.
• Procedural code focuses on a clear, linear flow
of control, making it ideal for straightforward,
small-to-medium-sized programs.

3. • By following a top-down approach, it simplifies complex
problems into manageable routines, making it a
foundational technique for understanding more
advanced programming concepts.
• In fact, procedural programming is still essential in
2025, powering critical systems like operating systems
(e.g., Linux kernel in C), embedded devices, and
performance-sensitive applications, where its
straightforward, efficient structure is necessary for low-
level control and resource management.
• Common procedural languages include C, Pascal, and
BASIC.
• https://hackr.io/blog/procedural-programming

7. Computer Software
• Software – a set of instructions or programs that tells a
computer what to do or how to perform a specific task
(computer software runs on hardware).
• Main types of software – systems software and
application software.
Application software - A computer program that provides
users with tools to accomplish a specific task
System software – it is designed to run a computer’s
hardware and application software, and make the
computer system available for use. It serves as the
interface between hardware, application software, and
the user.
https://opentextbc.ca/computerstudies/chapter/computer-hardware-and-software/

11. What is Computer ?
 Computer is an electronic device.
 Can store large amounts of data.
 Can performing operations on data.
 Performing given function on the data & displays the result
as output.
 Process data whenever needed.
 Known from ‘to compute’

12. What is Process?
 Computer works on data as per programme is called
process.
 Processing means operations like…..
 Calculations,
 Logical decision making,
 Outputting data,
 Communicating with others computer etc.

13. History of Computers
 First(1945-1955): Used vacuum tubes. Were very large.
Generated immense heat. Very expensive.
 Second(1955-1965): Used transistors. Continued to be large and
expensive.
 Third(1965-1975): Used integrated circuits. Significant reduction
in size and cost
 Fourth(1975-1995): Uses Very Large Scale Integration. Desktop
computers would not have been possible
without VLSI. It used Microprocessor minimizing the
size of P.C.
 Fifth (in progress): Will provide us with Artificial intelligence. Also
called knowledge information processing
system

14. Characteristics of Computer
 Speed
 Arithmetical and Logical
Operations
 Accuracy
 Reliability
 Storage
 Retrieving Data and
Programme
 Automation
 Versatility (Flexible)
 Consistency
 Communications

16. Computer Hardware
Hardware – Any physical device or equipment used in or with a
computer system (anything you can see and touch).
The hardware component of the computer system consists of 5
parts,
Input Unit, CPU, Primary Storage devices, Secondary Storage
devices and Output Unit.
Input Unit Examples: keyboard, mouse, trackpad (or touchpad),
touchscreen, joystick, microphone, light pen, webcam, speech
input, etc.
• Output Unit Examples: monitor, printer, speaker, display screen
(tablet, smartphone …), projector, head phone, etc.
•

17. Hardware/Software
• Computer Hardware
Parts of computer, which can be touch is called hardware.
(Physical Parts)
 Monitor
 CPU
 Key Board
 Mouse
 Speaker
• Computer Software
Parts of computer, which can not be touch is called software.
• Operating System Software : Windows, MAC, Linux
• Application Software : MS Office, Photoshop, Media Player
• Internet Browser Software : Internet Explorer, Google Chrome,
Mozilla Firefox, etc.

18. Classification of Computers
 Personal computer :
 A single-user computer
 Can be useful at School, Home, etc.
 Known as Micro Computer
 Laptop, Desktop
 Workstation :
 A powerful, single-user computer.
 A workstation is like a personal computer, but it has a more powerful
microprocessor
 higher-quality monitor.
 Can be found in companies etc.

19.  Minicomputer
 A multi-user computer
 Capable of supporting from 10 to hundreds of users simultaneously.
 Can be found in banks, government departments etc.
 Mainframe
 A powerful multi-user computer
 Capable of supporting hundreds or thousands of users simultaneously.
 Supercomputer
 An extremely fast computer
 Can perform hundreds of millions of instructions per second
 Weather, scientific research can be done by these types of computer.

20. Applications of Computer
• Science research
• Education
• Business applications
• Banking
• Office Automation
• Desktop publishing
• Management aids
• Engineering designing
• Road traffic control
• Railway
• Medicine
• Information services

21. What is Internet
 Inter connection of many computers via network.
 Global connected through network (through LAN or WAN)
 To provide the various application services i.e. E-Mail, Usenet (News),
WWW, Telnet, FTP, etc
 At any time millions user connected to the internet from many countries.

22. Uses of Internet
 Searching
 E-mail service
 Commercial Services
 Electronic books & Publication
 Video Conferencing
 Sharing data and results quickly
 Retrieving files & Program of all types
 Find information databases and tutorials
 News paper columns
 Banking
 Downloading / Uploading any information
 News, sports, stocks, music etc.
 Use of internet in various fields like education, Business, governance, etc.
 And many more ………………..

23. Useful Keys Internet
• Network: Connecting computers with each other For exchanging
information
• Client : It is a programme or computer for getting special
information from another compute.
• Server: It is a programme or computer, which gives information to
the client computer.
• Protocol: It’s a rules for connecting to the internet. (TCP/IP)
• Portal: It is a website. Known as a gateway of internet.
(Search engine)
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24. Router: It is a device, which decides where data will be send
(Network point)
www : World Wide Web
Browser: It is a programme which helps us to use internet
Website: Group of different web pages.
URL : Universal Resource Locator

25. .com : Commercial organization
.net : Large Networks
.gov : Government organization
.org : non-profit making organization
.edu : educational organization
.mil : military organization
.in : India
.au : Australia
.us : United States
.uk : United Kingdom
Types of Website (Domain No.)

26. Problem Solving
Computers play an important role in problem solving. We
communicate with a computer through some programming
language. But before we start the programming, the problem
to be solved requires some analysis.
Steps in Problem Solving:
1. Studying the problem in detail.
2. Understand carefully the given input and what input and what
output is required. Also identify the conditions and constraints
to be used.
3. Generating various methods of solution of the given problem.
4. Selecting the method which is considered to be best.
5. Preparing sequential steps for determining the solution.
6. Write a program to compute the results as using a computer
and get the results.

27. Algorithms
• An Algorithm is a finite sequence of well defined steps for solving a
problem.
• The most fundamental concept in computer science is the
algorithm. An algorithm is a step-by- step procedure for solving a
problem.
An algorithm has five important features:
1. Inputs: An algorithm may specify the quantities which are to be
read.
2. Outputs: An algorithm must specify the quantities which are to be
displayed or printed.
3. Definiteness: Each instruction must be clear and unambiguous.
4. Finiteness: An algorithm should be terminated after finite number
of steps.
5. Effectiveness: An algorithm must be effective which means that all
operations are executable.

28. • Complete Program to Understand C Coding Structure
• Based on the structure of the C program we discussed above, here is the final
and complete program:
• // Program to calculate the factorial of a number #include <stdio.h> //
Preprocessor directive #define MAX 10 // Definition of a constant int
factorial(int n); // Function declaration int main() { int n; // Variable
declaration printf("Enter a number: "); scanf("%d", &n); // Taking input from
user printf("Factorial of %d is %dn", n, factorial(n)); // Function call return
0; // Return statement } // Function to calculate factorial int factorial(int n)
{ int fact = 1; // Initialize factorial for (int i = 1; i <= n; i++) { // Loop to calculate
factorial fact *= i; } return fact; // Return calculated factorial }
• Output:
• Enter a number: 5 Factorial of 5 is 120
• This program shows all the components of a C program, including
documentation, preprocessor directives, function usage, and the ret

29. Thank You
Thank You