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Title: Computer Science Fundamentals –
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First Year IT Notes (2025 Edition)
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Table of Contents:
1. Introduction
2. Programming Basics
3. Computer Networks & Cybersecurity
4. Data Structures & SQL Basics
5. Practice Questions & Answers
, Page 1: Introduction
Welcome to the "Computer Science Fundamentals – First Year IT Notes (2025
Edition)". These notes are specially designed for beginners and first-year IT or Computer
Science students. Whether you're preparing for exams or brushing up on basics, this
document covers essential concepts with simplified explanations and practice material.
Topics Covered:
Programming Basics (Variables, Data Types, Loops, Functions)
Computer Networking Essentials
Data Structures Introduction
Basic Cybersecurity Principles
SQL and Databases
Page 2: Programming Basics
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1. Variables and Data Types
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Variables store data values used in programs. Common data types include:
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Integer (int): Whole numbers, e.g., x = 5
Float (float): Decimal numbers, e.g., price = 4.99
Character (char): A single character, e.g., 'A'
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String (str): A sequence of characters, e.g., name = "Alice"
Boolean (bool): True or False values, e.g., is_active = True
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2. Conditional Statements
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Used to make decisions based on conditions:
x = 10
if x > 5:
print("x is greater than 5")
elif x == 5:
print("x is 5")
else:
print("x is less than 5")
3. Loops
For loop: Repeats a block a known number of times:
for i in range(5):
print(i)
While loop: Runs until a condition becomes false:
count = 0
ee
qa
Kh
Title: Computer Science Fundamentals –
ad
First Year IT Notes (2025 Edition)
am
Table of Contents:
1. Introduction
2. Programming Basics
3. Computer Networks & Cybersecurity
4. Data Structures & SQL Basics
5. Practice Questions & Answers
, Page 1: Introduction
Welcome to the "Computer Science Fundamentals – First Year IT Notes (2025
Edition)". These notes are specially designed for beginners and first-year IT or Computer
Science students. Whether you're preparing for exams or brushing up on basics, this
document covers essential concepts with simplified explanations and practice material.
Topics Covered:
Programming Basics (Variables, Data Types, Loops, Functions)
Computer Networking Essentials
Data Structures Introduction
Basic Cybersecurity Principles
SQL and Databases
Page 2: Programming Basics
At
1. Variables and Data Types
ee
Variables store data values used in programs. Common data types include:
qa
Integer (int): Whole numbers, e.g., x = 5
Float (float): Decimal numbers, e.g., price = 4.99
Character (char): A single character, e.g., 'A'
Kh
String (str): A sequence of characters, e.g., name = "Alice"
Boolean (bool): True or False values, e.g., is_active = True
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2. Conditional Statements
am
Used to make decisions based on conditions:
x = 10
if x > 5:
print("x is greater than 5")
elif x == 5:
print("x is 5")
else:
print("x is less than 5")
3. Loops
For loop: Repeats a block a known number of times:
for i in range(5):
print(i)
While loop: Runs until a condition becomes false:
count = 0
