🟢 Foundation · Lesson 05

Structure of a C++ Program

What is Structure of a C++ Program?

Structure of a C++ Program
A C++ program is organized into header files, namespace declarations, global declarations, functions and the main function. Understanding this structure helps in reading long programs.

Level
🟢 Beginner – C++ Foundation

Example File
program-structure.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
header	Structure of a C++ Program programming में Header use होता है।
namespace	Structure of a C++ Program programming में Namespace use होता है।
function	Structure of a C++ Program programming में Function use होता है।
statement	Structure of a C++ Program programming में Statement use होता है।
block	Structure of a C++ Program programming में Block use होता है।

Syntax / Pattern

C++

General structure: include header → optional declarations → main() → statements → return.

Example Program

main.cpp

#include <iostream>
using namespace std;

int add(int a, int b) {
    return a + b;
}

int main() {
    cout << add(10, 20);
    return 0;
}

Expected Output

Program Explanation

The add() function is defined before main().
main() calls add(10,20).
The returned value is printed using cout.

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?

reading large programs
separating logic into functions
project organization

Common Mistakes

Putting statements outside any function.
Forgetting braces around function body.

Practice Tasks

Draw the structure of a C++ program.
Write a program with one user-defined function.

Summary

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