🟡 Control Flow · Lesson 23

Functions in C++

What is Functions in C++?

Functions in C++
A function is a named block of reusable code. It makes programs modular, readable and easier to test.

Level
🟡 Control Flow and Core Programming

Example File
functions.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
function	Functions in C++ programming में Function use होता है।
parameter	Functions in C++ programming में Parameter use होता है।
argument	Functions in C++ programming में Argument use होता है।
return value	Functions in C++ programming में Return value use होता है।
prototype	Functions in C++ programming में Prototype use होता है।

Syntax / Pattern

C++

return_type function_name(parameters) { statements; }

Example Program

main.cpp

#include <iostream>
using namespace std;
int square(int n){ return n*n; }
int main(){
    cout << square(6);
    return 0;
}

Expected Output

Program Explanation

square() receives 6 as argument.
It returns 6*6 to main().

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?

calculator operations
validation
report generation

Common Mistakes

Forgetting return statement in non-void function.
Mismatch between declaration and definition.

Practice Tasks

Create a function for simple interest.
Create a function to check even number.

Summary

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

Functions in C++ क्या है?

Functions in C++
A function is a named block of reusable code. It makes programs modular, readable and easier to test.

Level
🟡 Control Flow and Core Programming

Example File
functions.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
function	Function Functions in C++ programming में use होता है।
parameter	Parameter Functions in C++ programming में use होता है।
argument	Argument Functions in C++ programming में use होता है।
return value	Return value Functions in C++ programming में use होता है।
prototype	Prototype Functions in C++ programming में use होता है।

Syntax / Pattern

C++

return_type function_name(parameters) { statements; }

Example Program

main.cpp

#include <iostream>
using namespace std;
int square(int n){ return n*n; }
int main(){
    cout << square(6);
    return 0;
}

Expected Output

Program Explanation

square() receives 6 as argument.
It returns 6*6 to main().

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?

calculator operations
validation
report generation

आम गलतियाँ (Common Mistakes)

Forgetting return statement in non-void function.
Mismatch between declaration and definition.

अभ्यास (Practice Tasks)

Create a function for simple interest.
Create a function to check even number.

सारांश

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