Hello world program 😄

💥 Basic Hello World Program in C 😍

Program :

C

#include <stdio.h>

int main()

{

    printf("Hello, World!");

    return 0;

}

🔍 Explanation of Each Line (In Detail)

1️⃣ #include <stdio.h>

#include → This is a preprocessor directive.

It tells the compiler to include the standard input-output header file.

<stdio.h> contains built-in functions like:

printf() → used to print output

scanf() → used to take input

👉 Without this line, printf() will not work.

2️⃣ int main()

main() is the starting point of every C program.

The program execution always begins from this function.

int means this function will return an integer value.

3️⃣ { } (Curly Braces)

These define the body of the function.

All statements of the program are written inside these braces.

4️⃣ printf("Hello, World!");

printf() is an output function.

It prints the message written inside double quotes ("") on the screen.

✔ "Hello, World!" → This is a string constant (you studied constants earlier 😊)

✔ ; → Semicolon is used to terminate the statement in C.

5️⃣ return 0;

It ends the main() function.

0 means the program executed successfully.

The value is returned to the operating system.

🧠 Tokens Used in This Program

Token Type                     Example

Keyword                         int, return

Identifier                        main, printf

String Constant             "Hello, World!"

Special Symbol             { } ( ) ; # < >

Header File                   stdio.h

▶️ Output of Program 

Hello, World!

📌 Flow of Execution

• Preprocessor includes stdio.h
• Compiler starts from main()
• printf() prints message
• return 0; ends the program