C Programming Fundamentals

Repository with C programming exercises, exam solutions, and a small phonebook project developed while studying programming fundamentals.

About

This repository documents my practice with the C language, starting from basic input/output and conditionals and progressing through loops, arrays, strings, structs, pointers, dynamic memory, and modular programs split across .c and .h files.

The code is organized into three main areas:

• problem-sets/: practice lists with standalone exercises.
• exams/: exam questions renamed using the pattern exam_<exam-number>_q<question-number>.c.
• phonebook/: a small modular phonebook application.

Repository Structure

.
├── exams/
│   ├── exam_1_q1.c
│   ├── exam_1_q2.c
│   ├── exam_1_q3.c
│   └── ...
├── phonebook/
│   ├── contact.c
│   ├── contact.h
│   ├── main.c
│   ├── phonebook.c
│   └── phonebook.h
└── problem-sets/
    ├── problem-set-1/
    ├── problem-set-2/
    ├── problem-set-3/
    └── ...

Contents

Problem Sets

The problem-sets/ directory contains 138 standalone C exercises divided into numbered lists.

These exercises cover:

• Basic syntax and arithmetic operations
• Input and output with scanf and printf
• Conditional statements
• Loops
• Functions
• Arrays and matrices
• Strings
• Structs
• Pointers and dynamic memory

Each file can be compiled and executed independently.

Example:

gcc problem-sets/problem-set-1/exercise_01.c -o exercise_01
./exercise_01

Exams

The exams/ directory contains 12 refactored exam question files.

Naming pattern:

exam_<exam-number>_q<question-number>.c

Example:

gcc exams/exam_1_q2.c -o exam_1_q2
./exam_1_q2

Phonebook Project

The phonebook/ directory contains a small menu-driven contact manager built with multiple source and header files.

Features:

• Add contacts
• Remove contacts by name
• Search contacts by name
• List all contacts
• Store up to 100 contacts

Compile it with:

gcc phonebook/main.c phonebook/phonebook.c phonebook/contact.c -o phonebook_app
./phonebook_app

Requirements

• C compiler, such as gcc or clang
• Terminal or command-line environment

Compile All Files

To check all standalone exercises and exam files:

for file in problem-sets/**/*.c exams/*.c; do
  gcc -Wall -Wextra -pedantic "$file" -o /tmp/program
done

To compile the phonebook project:

gcc -Wall -Wextra -pedantic phonebook/main.c phonebook/phonebook.c phonebook/contact.c -o phonebook_app

Notes

These programs were developed as part of my learning process in C. Many exercises are intentionally small and focused on practicing one concept at a time.

Author

Breno Machado Barros