🟢 Foundation · Lesson 06

Comments in C++

What is Comments in C++?

Comments in C++
Comments are notes written inside a program for human readers. The compiler ignores comments. Good comments explain purpose, logic and important decisions.

Level
🟢 Beginner – C++ Foundation

Example File
comments.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
single-line comment	Single-Comments in C++ programming में line comment use होता है।
multi-line comment	Multi-Comments in C++ programming में line comment use होता है।
documentation	Comments in C++ programming में Documentation use होता है।

Syntax / Pattern

C++

Use // for one-line comments and /* ... */ for multi-line comments.

Example Program

main.cpp

#include <iostream>
using namespace std;

int main() {
    // This prints a message
    cout << "Learning comments";
    return 0;
}

Expected Output

Learning comments

Program Explanation

The line beginning with // is ignored by compiler.
The cout line actually prints the output.

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?

explaining formulas
documenting functions
making code readable

Common Mistakes

Writing too many useless comments.
Using comments to hide errors instead of fixing them.

Practice Tasks

Add comments to a marks calculation program.
Explain when multi-line comments are useful.

Summary

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

Comments in C++ क्या है?

Comments in C++
Comments are notes written inside a program for human readers. The compiler ignores comments. Good comments explain purpose, logic and important decisions.

Level
🟢 Beginner – C++ Foundation

Example File
comments.cpp

मुख्य फोकस
Concept + syntax + practical C++ program

इसे क्यों सीखें?

यह आपको सही और पढ़ने-योग्य C++ programs लिखने में मदद करता है।
यह school practicals, projects और competitive programming में बार-बार use होता है।
यह OOP, STL और data structures जैसे advanced topics की नींव बनाता है।

ज़रूरी Terms

Term	अर्थ / उपयोग
single-line comment	Single-line comment Comments in C++ programming में use होता है।
multi-line comment	Multi-line comment Comments in C++ programming में use होता है।
documentation	Documentation Comments in C++ programming में use होता है।

Syntax / Pattern

C++

Use // for one-line comments and /* ... */ for multi-line comments.

Example Program

main.cpp

#include <iostream>
using namespace std;

int main() {
    // This prints a message
    cout << "Learning comments";
    return 0;
}

Expected Output

Learning comments

Program Explanation

The line beginning with // is ignored by compiler.
The cout line actually prints the output.

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?

explaining formulas
documenting functions
making code readable

आम गलतियाँ (Common Mistakes)

Writing too many useless comments.
Using comments to hide errors instead of fixing them.

अभ्यास (Practice Tasks)

Add comments to a marks calculation program.
Explain when multi-line comments are useful.

सारांश

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