Hello World in C and C++ (Beginner Guide)

If you are starting with C or C++, the first program you will write is the classic Hello World. This guide shows simple examples in both languages and explains how to run them.

What is a Hello World Program?

A Hello World program is the simplest way to test if your development environment is working. It prints a message to the screen.

Hello World in C


#include <stdio.h>

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

Hello World in C++


#include <iostream>
using namespace std;

int main() {
    cout << "Hello, World!" << endl;
    return 0;
}

How to Compile and Run

Compile C program:

gcc hello.c -o hello

Run:

./hello

Compile C++ program:

g++ hello.cpp -o hello

Run:

./hello

Common Errors

Missing semicolon
Wrong compiler (gcc vs g++)
Incorrect file extension

FAQ

Why is Hello World important?

It confirms your compiler and environment are working correctly.

Can I run this on Windows?

Yes, using tools like MinGW or WSL.

Also read: How to optimize Windows performance