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C Programming

Real-World C Case Studies

Move beyond isolated syntax. Analyse requirements, design data structures, implement complete systems, trace execution, test edge cases and explain engineering decisions.

3Complete systems
35+Concepts connected
45+Test and trace steps
100%Compiler-ready C11 code

Case Study Library

Each case study follows the same professional path: understand → model → design → implement → trace → test → improve → explain in an interview.

CASE STUDY 01Intermediate

Student Record Management System

Build a persistent CRUD system that stores student ID, name, branch and CGPA in a binary file with validation and safe record replacement.

StructuresFunctionsBinary FilesValidationCRUDTemporary Files
Primary goalReliable record lifecycle
Core modelStudent structure
Persistencestudents.dat
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CASE STUDY 02Advanced

Inventory & Reorder Management

Model a small store using a sorted linked list, dynamic memory, stock transactions, inventory valuation, reorder alerts and text-file persistence.

Linked ListsPointersmalloc/freeFile ParsingReportsBusiness Rules
Primary goalStock decision support
Core modelProduct linked list
Persistenceinventory.txt
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CASE STUDY 03Intermediate

Electricity Billing System

Convert meter readings into a transparent bill using progressive tariff slabs, structured data, validated input and boundary-first testing.

StructuresArraysFunctionsSlab LogicValidationTesting
Primary goalCorrect progressive billing
Core modelBill + tariff slabs
Key skillBoundary reasoning
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How to learn from each case study

Do not begin by copying the final program. Follow the engineering sequence and make one design decision at a time.

1

Analyse

Identify users, inputs, outputs, constraints and failure cases.

2

Model

Choose structures, relationships, storage and function boundaries.

3

Implement

Build a minimum version and add validated operations incrementally.

4

Defend

Trace, test, analyse complexity and justify choices in interviews.

🎯 Completion standard

Explain without code

Describe the data flow, file strategy and error handling in your own words.

Rebuild one module

Implement Add, Search or Report from an empty editor without referring to the solution.

Extend the design

Add one new field, validation rule or report and update every affected function.