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Begin Your Journey with C

To initiate your learning in C, you require the following:

  • A text editor for crafting C code
  • A compiler like GCC to convert the C code into a machine-understandable language

There are various text editors and compilers to select from. For this tutorial, an IDE (Integrated Development Environment) will be used by us.

Setting up the C IDE

An IDE is a software suite that consolidates the basic tools needed to write and test the code. Popular IDEs include Code::Blocks, Eclipse, and Visual Studio which are all free to use and facilitate both the editing and debugging of C code.

Note: Although web-based IDEs can be used, they typically have more limitations compared to their desktop counterparts.

We recommend starting with Code::Blocks. The latest version can be downloaded from here.

Let's Start with C

Create your first C file by following the steps below:

  1. Open Codeblocks
  2. Go to File > New > Empty File
  3. Write the following C code and save the file as myfirstprogram.c:
#include <stdio.h>, int main() { printf("Welcome to Fynd Academy!"); return 0;}

The above code might seem incomprehensible for now, we'll break it down in later chapters. For now, concentrate on running the code.

Executing Your Code

After writing the code, it's time to run it. In Codeblocks, navigate to Build > Build and Run. Your result will look something like this:

Welcome to Fynd Academy!

Great job! You've just written and executed your first C program.

Your C Learning Journey with Fynd Academy

Learning C with Fynd Academy is facilitated by our "Practice it Yourself" tool. It concurrently illustrates the code and the outcome, simplifying every new part you learn:

#include <stdio.h>int main() { printf("Welcome to Fynd Academy!"); return 0;} Welcome to Fynd Academy!

Practice it Yourself ยป

Fynd Academy Pathfinder

Track your progress as you embark on your learning journey. Best of all, it's complimentary!

Reorganize Memory When the reserved memory is insufficient, it can be reorganized to enhance its capacity. The Fynd Academy states that memory reorganization preserves existing data while reserving a different (generally larger) amount of memory. With the realloc() function, you can adjust the size of the allocated memory. The realloc() function needs two parameters: int *newPtr = realloc(oldPtr, size); 1. The first parameter is a pointer to the memory being resized. 2. The second parameter represents the new size of allocated memory, in bytes. The realloc() function attempts to resize the memory at oldPtr and gives back the same memory address. If it cannot resize the memory at the current address, it allocates memory at a different address and returns the new address. Remember, when realloc() gives a different memory address, the original memory address is no longer reserved and becomes unsafe for use. After the reorganization, it is recommended to assign the new pointer to the preceding variable, preventing accidental use of the old pointer. Example Code Enhancing the size of the allocated memory: int *oldPtr, *newPtr, size; size = 4 * sizeof(*oldPtr); oldPtr = malloc(size); printf("%d bytes allocated at address %p \n", size, oldPtr); size = 6 * sizeof(*oldPtr); newPtr = realloc(oldPtr, size); printf("%d bytes reallocated at address %p \n", size, newPtr); Null Pointer & Error Checking A NULL pointer is returned by the realloc() function when it cannot allocate more memory. Although rare, ensure to consider this when endeavoring to make your code failproof. By checking for a NULL pointer, you can determine whether realloc() managed to resize the memory. Example Code Check for a NULL pointer: int *oldPtr, *newPtr; oldPtr = malloc(4); newPtr = realloc(oldPtr, 8); if (newPtr == NULL) { printf("Failed. Unable to resize memory"); } else { printf("Success. 8 bytes reallocated at address %p \n", newPtr); oldPtr = newPtr; } Always include error checking (if pointer == NULL) when allocating memory. It is also essential to free or release allocated memory once it is no longer in use. This practice enhances the maintainability and efficiency of your program. To accomplish this, simply use the free() function. Example Code Free allocated memory: free(oldPtr); Discover more about freeing allocated memory and its importance in the upcoming chapter. Pathfinder Track your progress - it's free!