Build Real C Programs from Variables to File I/O
Learn C programming hands-on — from your first compiled program through pointers, structs, and a complete final project.
This course takes you from setting up a C environment to building a menu-driven student grade management system with file persistence. You'll write, compile, and debug real code at every stage, developing the problem-solving habits that professional C programmers rely on. By the end, you'll have a working portfolio of programs that demonstrate practical competence in C.
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What you'll gain
Every concept is reinforced by a hands-on lab where you write and run real C code. You'll finish the course with 19 completed programs, not just an understanding of syntax.
Pointers, memory, and manual string handling are where most beginners stall. This course dedicates focused lessons and labs specifically to these topics so you build genuine confidence with them.
The final project is a fully functional, menu-driven grade management system with struct arrays and file I/O — the kind of structured program you can show as evidence of real C proficiency.
Who this course is for
You're comfortable with basic programming concepts but new to C and its lower-level memory model. This course will give you the practical C foundation that systems, OS, and embedded coursework will expect you to have.
You write code professionally in a higher-level language but need to work in C for a project, codebase, or career move. This course covers the language mechanics and idioms that make C behave differently from languages you already know.
You work in a technical field — hardware, embedded systems, networking — and need to read, write, or modify C code as part of your role. This course gives you the working knowledge to do that without guessing.
What you'll learn
The course opens with environment setup and the structure of a C program, then builds steadily through data types, operators, control flow, and functions. Each module introduces one core concept and immediately applies it in a lab before the next topic builds on it. The second half of the course tackles the subjects that define C as a language — pointers, structures, and file I/O — and ties everything together in a series of progressively more complex programs. The final two modules focus on program design, debugging, and a capstone project that integrates the full curriculum.
Module 1
Getting Started with C
2 lessons
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Module 2
Your First C Program
2 lessons
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Module 3
Variables and Data Types
2 lessons
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Module 4
Input and Output
2 lessons
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Module 5
Operators and Expressions
2 lessons
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Module 6
Decision Making with If Statements
2 lessons
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Module 7
Loops
2 lessons
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Module 8
Functions
2 lessons
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Module 9
Arrays
2 lessons
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Module 10
Strings
2 lessons
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Module 11
Pointers
2 lessons
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Module 12
Structures
2 lessons
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Module 13
File Input and Output
2 lessons
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Module 14
Building Real-World C Programs
2 lessons
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Module 15
Final Project and Next Steps
2 lessons
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Learn by doing
Each lab puts a specific skill into practice using gcc and the Linux terminal, with exercises ranging from reading compiler errors to building interactive, file-backed applications. Tools like GDB are introduced in the context of real debugging scenarios so you learn to use them when it matters. The labs are sequenced so that later projects build directly on code and patterns from earlier ones.
- Write a Hello World program and compile it using gcc in the terminal
- Understand the compilation workflow and interpret compiler output
- Use format specifiers to print integers, floats, and strings with proper alignment
- Experiment with escape sequences and field widths in printf()
- Intentionally introduce common syntax errors and read the compiler output
- Fix each error and verify the program compiles and runs correctly
- Declare variables of each primitive type and print their values with matching format specifiers
- Use sizeof() to discover memory sizes and compare int, long, float, and double
- Read a temperature value from the user with scanf() and print the converted result with printf()
- Handle both Celsius-to-Fahrenheit and Fahrenheit-to-Celsius conversions in a single program
- Accept a meal total and tip percentage from the user and compute the tip and grand total
- Format the output with two decimal places using printf() format specifiers
- Read a numeric score and use if / else-if chains to print the corresponding letter grade
- Add boundary validation to reject scores below 0 or above 100
- Use nested for loops to print a formatted N×N multiplication table
- Align columns using printf() field-width specifiers
- Use a while loop and do-while loop to let the user guess a target number with high/low hints
- Count and display the number of attempts when the user guesses correctly
- Extract add, subtract, multiply, and divide operations into separate functions with prototypes
- Call each function from main() and verify results match a direct calculation
- Read a list of numbers into an integer array and compute the minimum, maximum, and average
- Print the results and loop through the array to display all stored values
- Use strcpy(), strcat(), and strlen() to combine a first and last name into a formatted full name
- Convert the result to uppercase using a loop and toupper() from ctype.h
- Declare an integer array and traverse it using a pointer instead of an index
- Print each element's address and value to observe how pointer arithmetic advances memory
- Implement a swap() function that exchanges two integer values via pointer parameters
- Verify the swap worked by printing variable values before and after the function call
- Define a Student structure with name, ID, and grade fields, then populate an array of students
- Write a function that prints a formatted roster and another that finds the student with the highest grade
- Open a file for writing and use fprintf() to save a list of student names and scores
- Close the file and verify the contents using cat in the terminal
- Open the score file from Lab 13.1 for reading and use fscanf() to load each record into a struct array
- Compute and print the class average from the data read from the file
- Build a program with a do-while menu loop that lets the user add, list, and total expenses stored in an array of structs
- Save the expense list to a file when the user exits so it persists between runs
- Build a complete menu-driven program that stores student records in a struct array, supports add/list/search/delete, and saves data to a file
- Demonstrate correct use of functions with prototypes, arrays of structs, string handling, file I/O, and input validation in a single cohesive program
Destin Learning
Destin Learning creates practical, project-driven courses for developers, IT professionals, and tech enthusiasts who want to build real skills — not just pass a certification exam.
Every course is built around hands-on labs, working code, and real-world tools. Our students learn by doing: writing programs, configuring systems, and solving problems in environments that mirror what they'll encounter on the job.
Our courses cover systems programming, Linux administration, cloud infrastructure, AI and machine learning, and foundational computer science — all taught with the same philosophy: understand it deeply, build it yourself, and know why it works.
Destin Learning · destinlearning.com
Start Writing C Code Today
Self-paced video lessons and 19 hands-on labs give you everything you need to build real C programs from day one.
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