C Programs

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C Program: Hello World

C Program: Hello World

#include <stdio.h>   // Standard Input Output library
 
// Main function: program execution starts here
int main() {
    // Print message to screen
    printf("Hello, World!\n");
   
    return 0; // Exit status of program
}

 
OUTPUT :
Hello, World!

Explanation (Line by Line)

1. #include <stdio.h>
   • This is a preprocessor directive.
   • It tells the compiler to include the Standard Input Output header file (h).
   • This header file provides functions like printf() and scanf().


2. int main()
   • Every C program must have a main()
   • Execution always begins from main().
   • The int before main means this function returns an integer value (status code).


3. printf("Hello, World!\n");
   • printf() is a standard output function used to display text on the screen.
   • "Hello, World!" is the text string to display.
   • \n is an escape sequence that means "new line".
   • So after printing the message, the cursor moves to the next line.


4. return 0;
   • Ends the main()
   • Returns 0 to the operating system, which means the program executed successfully.

Using Turbo C (Old Windows IDE):

• Open file → Compile (Alt+F9) → Run (Ctrl+F9).