C Programming Tutorials (2025)

This folder is a personal collection of small C programs used to learn and practice C programming concepts in 2025.

Contents

Below are the main source files and folders in this repository (top-level files):

• ArrayExercise.c — small exercises using arrays
• Arrays.c — array examples
• ArraysLoop.c — iterating arrays with loops
• ArraysSumAndAverage.c — compute sum and average of array elements
• CalculatorVersion2.c — simple calculator example
• Copyofpassword.c — password-related example (copy)
• doWhile.c — example using do-while loop
• EvenNumberPrinter.c — prints even numbers
• EvenorOdd.c — checks even or odd
• forloop.c — up and down counting examples (fixed)
• forloop.out — compiled binary for forloop.c
• Functional Calculator.c — calculator demonstrating functions
• Functions.c — examples of functions
• Hello.c — simple hello world
• Hello — (possibly an output folder or alternate file)
• PasswordAttemptGames.c — password attempt / game example
• Pointers.c — examples using pointers
• PrintName.c — prints a name to stdout
• SimpleCalculator.c — another calculator example
• SimpleLoginSystem.c — very small login system demo
• Strings.c — string handling examples
• Sum of natural numbers.c — sum of first N natural numbers
• swicth.c — switch-case example (note spelling)
• TemperatureConverter.c — converts temperatures between units
• UsingScan.c — examples using scanf
• Variables.c — variable examples
• whileLoop.c — while loop example
• sum — (likely a small program or output)
• output/ — directory containing compiled outputs or sample outputs

How to compile

You can compile any single C source file with gcc. Example (compile forloop.c):

gcc -Wall -Wextra -std=c11 -o forloop.out "forloop.c"

Then run it:

./forloop.out

To compile many files quickly you can run a loop from the repository root:

for f in *.c; do gcc -Wall -Wextra -std=c11 -o "${f%.c}.out" "$f" 2>/dev/null && echo "built: ${f%.c}.out"; done

Notes and recommendations

• Filenames contain some spaces (e.g., Sum of natural numbers.c, Functional Calculator.c) — these work but are harder to manage in scripts; consider renaming them to use underscores or dashes.
• Some filenames have typos (swicth.c) — you may want to correct them if you use them frequently.
• Many example programs are self-contained; open each .c to see comments and how the example is structured.
• If you want, I can:
  • Add a Makefile to build common examples quickly,
  • Normalize file names to a consistent style,
  • Run and capture outputs for each program and place them in output/.

License

This folder contains learning code. Add a license file if you plan to share it publicly.

If you'd like, tell me how you'd like the README formatted (short list, detailed docs per file, or add a Makefile) and I'll update it accordingly.

Reorganization report (automatically generated)

Commit: 9789b21 — "Reorganize repository: group examples into lessons/, move binaries to builds/, docs to docs/" Author: FMB237 Date: Thu Oct 16 12:48:06 2025 +0100

Files moved: multiple files were reorganized into lessons/ subfolders and build artifacts moved to builds/ (see commit details in git history).

Compile summary (fresh run using gcc -Wall -Wextra -std=c11)

OK: many lesson examples compiled successfully. The following files produced warnings/errors that you may want to fix:

• lessons/01_basics/Variables.c — uses char grade = "C"; (string literal assigned to char). Use char grade = 'C'; or char *grade = "C";.
• lessons/04_pointers/PointersAndFunctions.c — a non-void function does not return on all paths; ensure all paths return a value or change signature to void.
• lessons/04_pointers/PointersExercise.c — has unused pointer variables (pa, pb) shown by compiler warnings.
• lessons/08_projects/SimpleLoginSystem.c — scanf("%s", &Trier); passes &Trier (type char (*)[10]) instead of Trier (type char *); use scanf("%9s", Trier); to avoid overflow.
• lessons/03_arrays/Arrays.c — printing an address with %d (printf("...%d", &score[2]);) is incorrect; use %p and cast to (void*).

Next recommended fixes:

1. Fix the simple issues above and re-run the compile step. I can apply these edits for you.
2. Add a top-level README.md describing the new lessons/ layout and a Makefile to build selected examples.
3. Add a .gitignore to avoid committing compiled binaries in future (e.g., builds/, *.out).

If you'd like, I can now apply the simple source fixes (Variables.c, SimpleLoginSystem.c, Arrays.c, and the non-void-return in PointersAndFunctions.c) and re-run compilation.