Advanced C

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What You'll Learn

Theory

Advanced C programming involves mastering arrays, pointers, and dynamic memory management. These concepts give you precise control over how data is stored and accessed.

Arrays

Arrays store multiple elements of the same type in contiguous memory locations. Array indexing starts at 0. C does not perform bounds checking — accessing outside an array's bounds leads to undefined behavior.

Pointers

A pointer stores the memory address of another variable. Pointers enable dynamic memory allocation, efficient array traversal, and function parameter passing by reference.

int x = 42;
int *ptr = &x;  // ptr stores the address of x
printf("%d", *ptr);  // dereference: prints 42

Memory Management

C programs use stack memory for local variables (automatic allocation) and heap memory for dynamically allocated data using malloc(), calloc(), and free(). The programmer is responsible for every allocation and deallocation.

Why this matters

Pointers and dynamic memory are what set C apart from higher-level languages. Understanding these concepts is crucial for systems programming and gives you unparalleled control over how your program uses memory.

What's next

In the next lessons, you'll dive deeper into each topic with hands-on examples and exercises.

Practical Examples

Example: Pointers and Dynamic Arrays

Exercises

Reverse an Array Using Pointers

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Write a C program that takes a static array of 5 integers, then uses pointers to reverse the array in-place and print the reversed result.

Starter Code:

#include <stdio.h>\n\nint main() {\n  int arr[] = {10, 20, 30, 40, 50};\n  // Your code here\n  return 0;\n}

Expected Output:

50 40 30 20 10