CACS 151 · Semester I

C Programming

A complete interactive study guide for CACS 151 — structured units, annotated code examples, past-paper solutions, and exam practice.

Units

Hours

~70

Questions

Start Learning

Unit 1

Introduction to C

Language Basics, Data Types & Operators

Introduction to C
Program Dev Lifecycle
Algorithms & Flowcharts
C Tokens

8h7 topics

Start

Unit 2

Input/Output & Control Structures

I/O Functions, Decisions & Loops

Standard I/O
If & If-Else
Nested If & Switch
For Loop

8h8 topics

Start

Unit 3

Functions, Arrays & Strings

Modular Code, Collections & Text

Functions
Call by Value/Ref
Recursion
1D Arrays

10h7 topics

Start

Unit 4

Structures, Unions & Enumerations

User-Defined Data Types

Structures
Nested Structures
Arrays of Structures
Unions

8h6 topics

Start

Unit 5

Pointers & Dynamic Memory

Memory Addresses, Pointer Arithmetic & Heap Allocation

Pointer Basics
Pointer Arithmetic
Pointers & Arrays
Pointers & Functions

10h7 topics

Start

Unit 6

File I/O, Command-Line & Graphics

File Handling, argc/argv & BGI Graphics

File Basics
Text File I/O
Binary & Random I/O
Command-Line Args

8h6 topics

Start

C Programming Playground

LIVE GCC

Write, edit and run real C code in the browser — powered by GCC via Piston API. 15 preset examples covering all 6 units.

Open Playground

Study Tools

Final Revision

5-tab revision suite: cheat sheet, syntax tables, exam patterns, predicted Qs, 1-day plan.

Flashcards

Flip-card study mode with unit filters, shuffle, and keyboard shortcuts.

Model Questions

20 model questions with full solutions, algorithms, C code, and exam notes.

Exam Simulator

Timed exam with real CACS 151 format — Group A/B/C, 3 hrs, 60 marks.

What's Inside

Interactive Code Examples

Annotated C programs with step-by-step execution traces for every key concept.

Past Papers 2019–2025

All CACS 151 exam questions solved with full explanations and mark breakdowns.

Pointer Visualizer

Dynamic memory diagrams showing address, value, and pointer relationships in real time.

Exam Simulator

Timed practice sessions with the real TU exam format — Group B & Group C questions.

Quick Start

Ready to start learning?

Unit 1 covers problem solving fundamentals — the foundation every other unit builds on. Jump in now.