🟢 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	First C++ Program: Hello World programming में Iostream use होता है।
main	First C++ Program: Hello World programming में Main use होता है।
cout	First C++ Program: Hello World programming में Cout use होता है।
return 0	First C++ Program: Hello World programming में Return 0 use होता है।

Syntax / Pattern

C++

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

Example Program

main.cpp

#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 एक ज़रूरी C++ topic है। परिभाषा सीखें, syntax समझें, example program चलाएं और फिर practice tasks हल करके concept मज़बूत करें।