Your First C Program: "Hello, World!"

When learning C programming, the “Hello, World!” program is traditionally your first step. It’s simple, easy to understand, and teaches the basic structure of a C program.

What Is the "Hello, World!" Program?

It’s a basic program that displays the message:

This program helps you understand the syntax and structure of a C program.

Code: Hello World in C

#include <stdio.h>

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

🧪 Step-by-Step Explanation

Line	Explanation
`#include <stdio.h>`	Preprocessor directive. Includes Standard Input Output library so you can use `printf()`
`int main()`	The main function – where the program starts running
`{ ... }`	Curly braces define the body of the function
`printf("Hello, World!\n");`	Prints text to the screen. `\n` means new line
`return 0;`	Ends the program and returns control to the OS

🛠️ How to Run Hello World (Step-by-Step)

✅ On Windows (using Code::Blocks)

Open Code::Blocks
Create a new project → Console Application → Select C
Paste the above code
Click Build and Run

✅ On Linux / macOS (using terminal)

Open a terminal
Create a file:
nano hello.c
Paste the code
Compile:
gcc hello.c -o hello
Run:
./hello

✅ Output

🎉 Congratulations — You’ve written your first C program!

🧠 Best Practices

Always include comments in your code
Keep code indented and clean
Use return 0; at the end of main() to indicate successful execution
Use meaningful output messages as you progress

❌ Common Mistakes to Avoid

Mistake	Solution
Missing semicolon	Add `;` at the end of `printf()`
Using wrong quotes	Use `" "` not `' '` for strings
Typo in `printf`	Make sure spelling is correct
Forgetting `#include` line	Required to use `printf()`