Complete C Programming Learning

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By Saif Nawab

Complete C Programming Learning Blog: From Zero to Advanced
Complete Learning Blog • Beginner to Advanced • Student Friendly

Complete C Programming Guide:
From Very Basics to Advanced

Welcome to your full C programming journey. This blog is designed for school students, teenagers, self-learners, and even adults who want a strong foundation in coding. We will start from what programming is, then learn how C works, and slowly move toward pointers, memory, file handling, dynamic allocation, debugging, and advanced concepts. You do not need prior coding experience.

Age 14 to Infinite Easy English Code Examples Solved Problems Practice Questions Mini Projects
Child learning computer programming
Image credit: Wikimedia Commons – Child using a computer

Table of Contents

Chapter 1

What is Programming?

Programming means giving instructions to a computer in a language it can understand. Think of a computer like a super-fast robot. The robot is powerful, but it is also very literal. If your instructions are correct, it works beautifully. If your instructions are confusing or incomplete, it gets stuck or gives wrong results.

Simple analogy: A recipe tells a cook how to make food. A program tells a computer how to solve a task.

In programming, we break problems into small steps. For example, if we want to calculate the average marks of a student, we need to take input, add the marks, divide by the number of subjects, and print the result.

C is a general-purpose language, and beginner tutorials commonly start with program structure, variables, control flow, functions, arrays, pointers, structures, and file handling. Source: W3Schools C Tutorial, GeeksforGeeks C Tutorial

Chapter 2

Why Learn C?

1. C teaches real programming basics

You learn variables, loops, functions, memory, arrays, pointers, and how programs are organized.

2. C is close to the machine

This helps you understand how computers store data and run instructions.

3. C is still important

C is used in operating systems, embedded systems, compilers, networking, and performance-critical software.

Many modern languages borrowed ideas and syntax from C. If you learn C properly, learning C++, Java, JavaScript, Python internals, Rust basics, and system programming becomes easier.

C has been widely used for decades and is important in systems, embedded software, compilers, databases, and networking. Source: GeeksforGeeks

Learn C not just to “write code”, but to understand how code really works.
Chapter 3

How C Code Becomes a Program

When you write C code, the computer cannot directly understand it. A compiler converts it into machine code.

Basic flow

Step 1: You write code in a file like main.c
Step 2: The preprocessor handles #include and #define
Step 3: The compiler translates C into assembly/object code
Step 4: The linker joins required parts into an executable program
Step 5: You run the program

Important words

  • Source code: Human-readable code
  • Compiler: Converts source code into machine-level output
  • Executable: The final runnable program
  • Bug: Mistake in a program
  • Syntax error: Grammar mistake in code
  • Logic error: Program runs, but gives wrong output
// Example compile command (GCC)
gcc main.c -o main

The GNU C manual explains lexical elements, data types, arrays, structures, and pointers, while general C learning paths also include the compilation process and program structure. Source: GNU C Manual, GeeksforGeeks

Chapter 4

Your First C Program: Hello World

#include <stdio.h>

int main() {
    printf("Hello, World!\n");
    return 0;
}

Line-by-line explanation

  1. #include <stdio.h> → This includes the standard input-output library. It gives us access to printf().
  2. int main() → Every C program starts running from the main function.
  3. { → Start of the function body.
  4. printf("Hello, World!\n"); → Prints text on the screen. \n moves to the next line.
  5. return 0; → Tells the operating system the program ended successfully.
  6. } → End of the function body.
Why is this program so famous?

“Hello, World!” is the traditional first program because it is short and shows the full basic structure: header file, main function, output statement, and successful program exit.

Chapter 5

C Syntax, Comments, and Program Structure

ConceptMeaningExample
StatementA single instructionx = 5;
SemicolonEnds most statementsprintf("Hi");
BlockGroup of code inside braces{ ... }
CommentIgnored by compiler// one line, /* multi-line */
// Single-line comment

/* Multi-line
   comment */

#include <stdio.h>

int main() {
    int age = 14;
    printf("Age = %d\n", age);
    return 0;
}

Rule: C is case-sensitive. age, Age, and AGE are different names.

Chapter 6

Variables and Data Types

A variable is like a labeled box in memory that stores a value. Different types of data need different boxes.

Data TypeUseExample
intWhole numbers5, -2, 100
floatDecimal values3.14
doubleMore precise decimal values10.123456
charSingle character'A'
#include <stdio.h>

int main() {
    int marks = 95;
    float price = 19.5;
    char grade = 'A';

    printf("Marks = %d\n", marks);
    printf("Price = %.1f\n", price);
    printf("Grade = %c\n", grade);

    return 0;
}

Code Example: Declaring and Using Variables

int age = 15;
float height = 5.4;
char section = 'B';

Beginner mistake: Using a variable before assigning a value can cause unpredictable results.

The GNU C manual explains identifiers, constants, integer and real-number types, arrays, structures, and pointers as core language foundations. Source: GNU C Manual

Chapter 7

Input and Output

We use printf() to print output and scanf() to take input.

#include <stdio.h>

int main() {
    int num;
    printf("Enter a number: ");
    scanf("%d", &num);
    printf("You entered: %d\n", num);
    return 0;
}

Why do we use &num in scanf?

Because scanf() needs the memory address where the value should be stored. This idea becomes very important when we study pointers.

Common format specifiers

  • %d → integer
  • %f → float
  • %lf → double
  • %c → character
  • %s → string

Careful: Mixing the wrong format specifier with the wrong data type causes errors or garbage output.

Chapter 8

Operators in C

Arithmetic Operators

  • + addition
  • - subtraction
  • * multiplication
  • / division
  • % remainder

Comparison Operators

  • == equal to
  • != not equal to
  • >, <
  • >=, <=
#include <stdio.h>

int main() {
    int a = 10, b = 3;
    printf("a + b = %d\n", a + b);
    printf("a - b = %d\n", a - b);
    printf("a * b = %d\n", a * b);
    printf("a / b = %d\n", a / b);
    printf("a %% b = %d\n", a % b);
    return 0;
}

Important: 10 / 3 with integers gives 3, not 3.333.

Chapter 9

Conditions and Decisions: if, else, switch

#include <stdio.h>

int main() {
    int marks = 82;

    if (marks >= 90) {
        printf("Grade A+\n");
    } else if (marks >= 75) {
        printf("Grade A\n");
    } else if (marks >= 60) {
        printf("Grade B\n");
    } else {
        printf("Need more practice\n");
    }

    return 0;
}

Line-by-line explanation: Grade Checker

  1. int marks = 82; stores the student's marks.
  2. if (marks >= 90) checks the first condition.
  3. If true, program prints Grade A+.
  4. else if checks the next condition only if the previous one was false.
  5. Since 82 is not ≥ 90 but is ≥ 75, it prints Grade A.
  6. else runs when none of the earlier conditions are true.
#include <stdio.h>

int main() {
    int day = 3;

    switch (day) {
        case 1: printf("Monday\n"); break;
        case 2: printf("Tuesday\n"); break;
        case 3: printf("Wednesday\n"); break;
        default: printf("Invalid day\n");
    }

    return 0;
}
Chapter 10

Loops: Repeating Work

Loops save time by repeating code.

for

Best when you know how many times to repeat.

while

Best when you repeat until a condition becomes false.

do-while

Runs at least once.

#include <stdio.h>

int main() {
    for (int i = 1; i <= 5; i++) {
        printf("%d\n", i);
    }
    return 0;
}
#include <stdio.h>

int main() {
    int i = 1;
    while (i <= 5) {
        printf("%d\n", i);
        i++;
    }
    return 0;
}

Line-by-line explanation: Table Printer

#include <stdio.h>

int main() {
    int n = 7;

    for (int i = 1; i <= 10; i++) {
        printf("%d x %d = %d\n", n, i, n * i);
    }

    return 0;
}
  1. int n = 7; means we want the multiplication table of 7.
  2. for (int i = 1; i <= 10; i++) runs from 1 to 10.
  3. Each time, it prints one line of the table.
  4. n * i calculates the product.
Chapter 11

Functions: Divide Big Work into Small Parts

A function is a reusable block of code that performs a specific task. Functions make programs cleaner and easier to understand. 

#include <stdio.h>

int add(int a, int b) {
    return a + b;
}

int main() {
    int result = add(4, 6);
    printf("Sum = %d\n", result);
    return 0;
}

Why functions matter

  • Reduce repetition
  • Improve readability
  • Help testing
  • Make debugging easier

Function parts

  • Return type → what it gives back
  • Name → function name
  • Parameters → inputs
  • Body → actual work
// No return value example
#include <stdio.h>

void greet() {
    printf("Welcome to C!\n");
}

int main() {
    greet();
    return 0;
}
Chapter 12

Arrays and Strings

Arrays

An array stores many values of the same type in a row.

#include <stdio.h>

int main() {
    int marks[5] = {78, 88, 91, 67, 85};

    for (int i = 0; i < 5; i++) {
        printf("%d ", marks[i]);
    }

    return 0;
}

Line-by-line explanation: Array Average

#include <stdio.h>

int main() {
    int arr[5] = {10, 20, 30, 40, 50};
    int sum = 0;

    for (int i = 0; i < 5; i++) {
        sum += arr[i];
    }

    printf("Average = %.2f\n", sum / 5.0);
    return 0;
}
  1. arr[5] creates an array of 5 integers.
  2. sum = 0 starts the total from zero.
  3. The loop visits each element one by one.
  4. sum += arr[i] means sum = sum + arr[i].
  5. 5.0 is used to force decimal division.

Strings

In C, a string is an array of characters ending with a special null character '\0'. 

#include <stdio.h>

int main() {
    char name[] = "Aarav";
    printf("Name = %s\n", name);
    return 0;
}
// String length manually
#include <stdio.h>

int main() {
    char word[] = "code";
    int length = 0;

    while (word[length] != '\0') {
        length++;
    }

    printf("Length = %d\n", length);
    return 0;
}

Arrays and pointers are core concepts in the GNU C manual, and mainstream tutorials place arrays, strings, and functions in the beginner-to-intermediate path. Source: GNU C Manual, W3Schools

Chapter 13

Pointers: The Most Important Big Idea in C

A pointer stores a memory address. If a variable is a box, then a pointer is a note telling you where that box is located. 

#include <stdio.h>

int main() {
    int x = 10;
    int *p = &x;

    printf("x = %d\n", x);
    printf("Address of x = %p\n", (void*)&x);
    printf("Pointer p stores = %p\n", (void*)p);
    printf("Value at p = %d\n", *p);

    return 0;
}

Line-by-line explanation: Pointer Example

  1. int x = 10; creates a normal integer variable.
  2. int *p = &x; creates a pointer p that stores the address of x.
  3. &x means “address of x”.
  4. *p means “value stored at the address inside p”.
  5. So if p points to x, then *p gives 10.
// Modifying a value through a pointer
#include <stdio.h>

int main() {
    int x = 5;
    int *p = &x;

    *p = 20;
    printf("x = %d\n", x);

    return 0;
}

Golden rule: Never use a pointer that does not point to valid memory.

Chapter 14

Structures, Unions, and Enums

Structures

A structure groups related data together.

#include <stdio.h>

struct Student {
    char name[20];
    int age;
    float marks;
};

int main() {
    struct Student s = {"Riya", 15, 92.5};

    printf("Name: %s\n", s.name);
    printf("Age: %d\n", s.age);
    printf("Marks: %.1f\n", s.marks);

    return 0;
}

Line-by-line explanation: Struct Example

  1. struct Student defines a new custom data structure.
  2. char name[20] stores the student's name.
  3. int age stores age.
  4. float marks stores marks.
  5. struct Student s = {"Riya", 15, 92.5}; creates one student record.
  6. s.name, s.age, and s.marks access fields.

Union

A union can store different data types in the same memory location, but only one meaningfully at a time. 

#include <stdio.h>

union Data {
    int i;
    float f;
    char str[20];
};

int main() {
    union Data d;
    d.i = 10;
    printf("Integer: %d\n", d.i);
    return 0;
}

Enum

#include <stdio.h>

enum Day {MON, TUE, WED, THU, FRI, SAT, SUN};

int main() {
    enum Day today = WED;
    printf("Value of WED = %d\n", today);
    return 0;
}

Structures, unions, arrays, and pointers are part of the C language core and commonly listed in C learning paths. Source: GNU C Manual, GeeksforGeeks

Chapter 15

Recursion

Recursion means a function calls itself. It is useful in mathematical problems, trees, searching patterns, and divide-and-conquer ideas. 

#include <stdio.h>

int factorial(int n) {
    if (n == 0 || n == 1) {
        return 1;
    }
    return n * factorial(n - 1);
}

int main() {
    printf("%d\n", factorial(5));
    return 0;
}

Important: Every recursive function needs a base case, otherwise it can run forever and crash.

Chapter 16

Header Files, Macros, and Preprocessor

#include <stdio.h>
#define PI 3.14159

int main() {
    float radius = 2.0;
    float area = PI * radius * radius;
    printf("Area = %.2f\n", area);
    return 0;
}

The preprocessor runs before the main compilation step. It handles things like:

  • #include → add header files
  • #define → create constants/macros
  • #ifdef → conditional compilation
// Example of a function-like macro
#define SQUARE(x) ((x) * (x))

Macro caution: Badly written macros can create tricky bugs. Always use extra parentheses.

Chapter 17

Storage Classes

KeywordUseSimple Meaning
autoDefault local variableNormal local storage
registerSuggest fast accessMay be stored in CPU register
staticKeep value between function callsLong lifetime
externVariable defined elsewhereShared across files
#include <stdio.h>

void countCalls() {
    static int count = 0;
    count++;
    printf("Called %d times\n", count);
}

int main() {
    countCalls();
    countCalls();
    countCalls();
    return 0;
}
Chapter 18

Dynamic Memory Allocation

Sometimes you do not know in advance how much memory you need. Dynamic memory lets you request memory while the program is running. 

#include <stdio.h>
#include <stdlib.h>

int main() {
    int n = 5;
    int *arr = (int *)malloc(n * sizeof(int));

    if (arr == NULL) {
        printf("Memory allocation failed\n");
        return 1;
    }

    for (int i = 0; i < n; i++) {
        arr[i] = (i + 1) * 10;
    }

    for (int i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }

    free(arr);
    return 0;
}

Line-by-line explanation: Dynamic Memory Example

  1. #include <stdlib.h> gives access to malloc() and free().
  2. int *arr is a pointer to integer memory.
  3. malloc(n * sizeof(int)) asks for memory for 5 integers.
  4. If memory allocation fails, malloc() returns NULL.
  5. We store values using arr[i].
  6. free(arr) releases memory after use.
// calloc example
int *arr = (int *)calloc(5, sizeof(int));

// realloc example
arr = (int *)realloc(arr, 10 * sizeof(int));

Very important: If you forget free(), your program may leak memory.

Dynamic memory allocation, memory leaks, and memory layout are standard intermediate-to-advanced topics in C tutorials. Source: GeeksforGeeks

Chapter 19

File Handling

File handling lets programs store data permanently instead of losing it when the program ends. 

#include <stdio.h>

int main() {
    FILE *fp = fopen("notes.txt", "w");

    if (fp == NULL) {
        printf("Could not open file\n");
        return 1;
    }

    fprintf(fp, "C programming is powerful.\n");
    fclose(fp);

    return 0;
}
#include <stdio.h>

int main() {
    FILE *fp = fopen("notes.txt", "r");
    char line[100];

    if (fp == NULL) {
        printf("Could not open file\n");
        return 1;
    }

    fgets(line, sizeof(line), fp);
    printf("%s", line);

    fclose(fp);
    return 0;
}

Line-by-line explanation: File Write and Read

  1. FILE *fp creates a file pointer.
  2. fopen("notes.txt", "w") opens file for writing.
  3. If opening fails, fp == NULL.
  4. fprintf() writes formatted text to the file.
  5. fclose(fp) closes the file safely.
  6. With mode "r", the file is opened for reading.
  7. fgets() reads one line into a character array.
ModeMeaning
"r"Read
"w"Write (overwrite)
"a"Append
"rb", "wb"Binary modes
Chapter 20

Command-Line Arguments

#include <stdio.h>

int main(int argc, char *argv[]) {
    printf("Total arguments: %d\n", argc);

    for (int i = 0; i < argc; i++) {
        printf("argv[%d] = %s\n", i, argv[i]);
    }

    return 0;
}

argc tells how many arguments were given, and argv stores them as strings.

Chapter 21

Error Handling and Debugging Mindset

Common error types

  • Syntax errors
  • Runtime errors
  • Logic errors
  • Memory errors

Debugging checklist

  • Read the error message carefully
  • Check line numbers
  • Print variable values
  • Test with small inputs
  • Change one thing at a time
#include <stdio.h>

int main() {
    int a = 10, b = 0;

    if (b == 0) {
        printf("Division by zero is not allowed\n");
        return 1;
    }

    printf("%d\n", a / b);
    return 0;
}

Smart habit: Always check file pointers, memory allocation, array limits, and user input.

Chapter 22

Program Memory Layout and Undefined Behavior

A running program usually uses different memory regions such as code segment, global/static area, stack, and heap.

Stack

Stores local variables and function call information. Fast but limited.

Heap

Stores dynamically allocated memory. Flexible but must be managed manually.

Undefined behavior means the C language does not guarantee what will happen. The program might work, crash, or behave differently on another compiler. 

// Dangerous example: out-of-bounds array access
int arr[3] = {1, 2, 3};
printf("%d\n", arr[5]); // undefined behavior
// Dangerous example: using uninitialized variable
int x;
printf("%d\n", x); // undefined behavior

The GNU C manual includes detailed discussion of evaluation order, storage, and overflow-related issues that are important for advanced correctness and safe C programming. Source: GNU C Manual

Chapter 23

Advanced Topics Overview

You do not need to master all of these on day one, but you should know their names and purpose.

Signals

Programs reacting to external events like interrupts.

Sockets

Communication between computers over networks.

Multithreading

Running multiple tasks at the same time.

Variadic functions, signals, socket programming, generics, and multithreading are commonly listed as advanced C topics. Source: GeeksforGeeks

Chapter 24

Important Solved Examples

1. Sum of Two Numbers

#include <stdio.h>

int main() {
    int a, b;
    scanf("%d %d", &a, &b);
    printf("Sum = %d\n", a + b);
    return 0;
}
  1. Takes two integers as input.
  2. Stores them in a and b.
  3. Adds them and prints the result.

2. Even or Odd

#include <stdio.h>

int main() {
    int n = 7;
    if (n % 2 == 0)
        printf("Even\n");
    else
        printf("Odd\n");
    return 0;
}

3. Largest of Three Numbers

#include <stdio.h>

int main() {
    int a = 5, b = 12, c = 9;

    if (a >= b && a >= c)
        printf("Largest = %d\n", a);
    else if (b >= a && b >= c)
        printf("Largest = %d\n", b);
    else
        printf("Largest = %d\n", c);

    return 0;
}

4. Factorial Using Loop

#include <stdio.h>

int main() {
    int n = 5;
    long long fact = 1;

    for (int i = 1; i <= n; i++) {
        fact *= i;
    }

    printf("Factorial = %lld\n", fact);
    return 0;
}

5. Reverse a Number

#include <stdio.h>

int main() {
    int n = 1234, rev = 0;

    while (n != 0) {
        rev = rev * 10 + n % 10;
        n /= 10;
    }

    printf("Reversed = %d\n", rev);
    return 0;
}

6. Prime Number Check

#include <stdio.h>

int main() {
    int n = 29, isPrime = 1;

    if (n <= 1) isPrime = 0;

    for (int i = 2; i * i <= n; i++) {
        if (n % i == 0) {
            isPrime = 0;
            break;
        }
    }

    if (isPrime) printf("Prime\n");
    else printf("Not Prime\n");

    return 0;
}

7. Swap Two Numbers Using Pointer Function

#include <stdio.h>

void swap(int *a, int *b) {
    int temp = *a;
    *a = *b;
    *b = temp;
}

int main() {
    int x = 10, y = 20;
    swap(&x, &y);
    printf("x = %d, y = %d\n", x, y);
    return 0;
}

8. Count Vowels in a String

#include <stdio.h>

int main() {
    char str[] = "education";
    int count = 0;

    for (int i = 0; str[i] != '\0'; i++) {
        char ch = str[i];
        if (ch=='a'||ch=='e'||ch=='i'||ch=='o'||ch=='u'||
            ch=='A'||ch=='E'||ch=='I'||ch=='O'||ch=='U') {
            count++;
        }
    }

    printf("Vowels = %d\n", count);
    return 0;
}

9. Read and Print Array

#include <stdio.h>

int main() {
    int arr[3];

    for (int i = 0; i < 3; i++) {
        scanf("%d", &arr[i]);
    }

    for (int i = 0; i < 3; i++) {
        printf("%d ", arr[i]);
    }

    return 0;
}
Chapter 25

Practice Questions

Easy Level
  1. Print your name, age, and school using printf().
  2. Take two numbers and print their sum.
  3. Take a number and print whether it is even or odd.
  4. Find the square of a number.
  5. Convert Celsius to Fahrenheit.
  6. Print numbers from 1 to 20 using a loop.
  7. Print the multiplication table of 9.
  8. Find the larger of two numbers.
  9. Take a character and check whether it is a vowel.
  10. Find the area of a rectangle.
Medium Level
  1. Find the factorial of a number.
  2. Count digits in a number.
  3. Reverse a number.
  4. Check whether a number is prime.
  5. Find the sum of array elements.
  6. Find the average of 10 marks stored in an array.
  7. Count vowels in a string.
  8. Check whether a string is palindrome.
  9. Use a function to calculate power of a number.
  10. Create a structure for a book and print its details.
Hard Level
  1. Sort an array in ascending order.
  2. Find the second largest element in an array.
  3. Implement matrix addition.
  4. Implement recursive Fibonacci.
  5. Use pointers to swap numbers.
  6. Dynamically allocate an array and fill it with user input.
  7. Store student records in a file.
  8. Read a file and count words.
  9. Create a menu-driven calculator.
  10. Build a quiz game using arrays, strings, and score logic.
Hints for selected practice questions
  • Prime check: Try dividing only up to sqrt(n).
  • Palindrome string: Compare characters from left and right ends.
  • Second largest: Track both largest and second largest during one pass.
  • Word count in file: Read character by character and count transitions from space to word.
Chapter 26

Mini Projects

1. Calculator

Use switch-case, input, arithmetic operations.

2. Student Report Card

Use arrays, loops, average, grade logic.

3. Number Guessing Game

Use loops, conditions, random number.

4. To-Do List Saver

Use file handling for save/load.

5. Library Book Record

Use structures and file handling.

Fully Explained Mini Project 1: Menu-Driven Calculator

#include <stdio.h>

int main() {
    int choice;
    float a, b;

    printf("1. Add\n2. Subtract\n3. Multiply\n4. Divide\n");
    printf("Enter choice: ");
    scanf("%d", &choice);

    printf("Enter two numbers: ");
    scanf("%f %f", &a, &b);

    switch (choice) {
        case 1: printf("Result = %.2f\n", a + b); break;
        case 2: printf("Result = %.2f\n", a - b); break;
        case 3: printf("Result = %.2f\n", a * b); break;
        case 4:
            if (b != 0)
                printf("Result = %.2f\n", a / b);
            else
                printf("Division by zero not allowed\n");
            break;
        default:
            printf("Invalid choice\n");
    }

    return 0;
}

What this project teaches: input, switch-case, arithmetic, error handling.

Fully Explained Mini Project 2: Student Report Card

#include <stdio.h>>

int main() {
    int marks[5];
    int sum = 0;
    float avg;

    printf("Enter marks of 5 subjects:\n");
    for (int i = 0; i < 5; i++) {
        scanf("%d", &marks[i]);
        sum += marks[i];
    }

    avg = sum / 5.0;
    printf("Average = %.2f\n", avg);

    if (avg >= 90) printf("Grade A+\n");
    else if (avg >= 75) printf("Grade A\n");
    else if (avg >= 60) printf("Grade B\n");
    else if (avg >= 40) printf("Grade C\n");
    else printf("Fail\n");

    return 0;
}

What this project teaches: arrays, loops, average calculation, decision-making.

Visual Learning

Learning Journey Illustration

Computer science education illustration
Image credit: Wikimedia Commons – Computer science education
Chapter 27

30-Day C Programming Roadmap

Days 1–3: Learn what programming is, how C works, write Hello World, practice print statements.
Days 4–6: Variables, data types, input/output, operators.
Days 7–9: if-else, switch, comparisons, small decision programs.
Days 10–12: for, while, do-while loops, tables, patterns, factorial.
Days 13–15: Functions and recursion basics.
Days 16–18: Arrays, strings, searching, counting, average programs.
Days 19–21: Pointers, address, dereferencing, function pointers intro later.
Days 22–23: Structures, unions, enums

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