Hello World!

Part of the Fundamentals section of Coddy's C journey. Lesson 2 of 63.

The "Hello World!" program is simple and outputs Hello, World! to the screen. It's often used as a first program when learning a new programming language.

In C, we use the printf() function to print output to the console. The text to be printed is placed within double quotes and followed by a semicolon.

#include <stdio.h>

int main() {
    printf("Hello, World!");
}

The #include <stdio.h> line includes the standard input/output library, which contains the printf() function.

Challenge

Easy

Use the code view to write a program that outputs Hello, World!

Note that anything inside quotation marks is case sensitive. For example:
printf("Hello, World!");
printf("hello, world!");
are different things (notice the capital letters in the first line).

Try it yourself

#include <stdio.h>

int main() {
    printf("");  // put the message between the quotes
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

C LanguageHello World!Comments Basic Program Structure

4Control Flow

If Statement If - Else Else-If Switch Case Ternary Conditional Operator Recap Challenge Nested If - Else

7Functions

Declare a Function Return Types Parameters Recap Challenge #1 Recursion Basics Function Prototypes Recap Challenge #2

Practice on your own: Online C compiler