🟢 Foundation · Lesson 04

First C++ Program: Hello World

What is First C++ Program: Hello World?

First C++ Program: Hello World
The first C++ program teaches the basic structure of C++: header file, namespace, main function, output statement and return value.

Level
🟢 Beginner – C++ Foundation

Example File
first-program.cpp

Main Focus
Concept + syntax + practical C++ program

Why should you learn this?

It helps you write correct and readable C++ programs.
It is used repeatedly in school practicals, projects and competitive programming.
It builds the base for advanced topics such as OOP, STL and data structures.

Important Terms

Term	Meaning / Use
iostream	Iostream used in First C++ Program: Hello World programming.
main	Main used in First C++ Program: Hello World programming.
cout	Cout used in First C++ Program: Hello World programming.
return 0	Return 0 used in First C++ Program: Hello World programming.

Syntax / Pattern

Every executable C++ program must have a main() function.

Example Program

#include <iostream>
using namespace std;

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

Expected Output

Hello World

Program Explanation

iostream provides cout and endl.
endl moves the cursor to the next line.
return 0 means successful program completion.

Exam Tip: In C++ practical answers, write the logic first, then the program, then expected output. For theory, always include one suitable example.

Where will you use it?

checking compiler setup
starting syntax practice
understanding output statements

Common Mistakes

Writing Main instead of main.
Missing semicolon after cout statement.
Forgetting #include <iostream>.

Practice Tasks

Print your school name.
Print three lines using three cout statements.

Summary

First C++ Program: Hello World is an important C++ topic. Learn the definition, understand the syntax, run the example program and then solve the practice tasks to make the concept strong.