This course covers C++ programming from fundamentals to advanced topics like inheritance and templates, exploring loops, functions, and core techniques for a solid beginner-to-intermediate foundation.

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Learn C++ for free with this interactive course, and get a hands-on experience of one of the most popular programming languages in the world.

You’ll start with a simple “Hello World” program and then move on to core concepts such as conditional statements, loops, and functions in C++. Then, you’ll explore more advanced topics like inheritance, classes, and templates, along with much more.

After completing this course, you’ll be an intermediate-level C++ developer, ready to take on your own projects.

Learn C++ from Scratch

**(True or False)** A function needs a function definition to perform a specific task.

(True or False) A function needs a function definition to perform a specific task.

**(True or False)** If a function returns no value, the return type must be declared as void.

(True or False) If a function returns no value, the return type must be declared as void.

**(True or False)** A local variable declared in a function is usable outside that function.

(True or False) A local variable declared in a function is usable outside that function.

`cout` statement needs to be written after the return statement

Cannot multiply `x` with `y` and return the answer in the same line

Need to pass both `x` and `y` parameters by reference 

Cannot return a value since the function is of type void

What is the error in the following function definition?
```
void myfunction(int x,int y){
 cout<<x*y;
 return(x*y);
}
```

What is the error in the following function definition?
<pre><code>void myfunction(int x,int y){
 cout&lt;&lt;x*y;
 return(x*y);
}
</code></pre>

The type of the parameter `y` is missing, which should be `int`

Find the error in the following function definition:
```
int myfunction(int x,y){
    return(x*y);
}
```

Find the error in the following function definition:
<pre><code>int myfunction(int x,y){
 return(x*y);
}
</code></pre>

What is the value of `answer` in the following recursive function?
```
int fun(int n)
{
	if (n == 4){
	return n;
  }else{
  return 2*fun(n+1);
  }
}

int main(){
int answer = fun(2);
}
```



What is the value of <code>answer</code> in the following recursive function?
<pre><code>int fun(int n)
{
	if (n == 4){
	return n;
 }else{
 return 2*fun(n+1);
 }
}

int main(){
int answer = fun(2);
}
</code></pre>

The function cannot modify the original variable.

The function receives a copy of the variable.

The function can modify the original variable directly.



Which statement is true when passing a variable by reference to a function in C++?


Which statement is true when passing a variable by reference to a function in C++?

The function will modify the constant value.

The function will create a copy of the constant value.


The code will result in a compilation error.



The function will treat the constant as a variable.

What happens if we try to pass a constant value (e.g., 5) by reference to a function?


What happens if we try to pass a constant value (e.g., 5) by reference to a function?

To prevent the function from modifying the original variable

To improve performance by avoiding copying large amounts of data

To ensure the function works only with primitive data types


To make the code more difficult to understand

When should we use pass by reference instead of pass by value?

When should we use pass by reference instead of pass by value?

It ensures the function cannot modify the original variables.

It allows the function to work only with global variables.

It enables the function to return multiple values through arguments.


It avoids memory allocation in the function.

What is a key advantage of using pass by reference in a function?


What is a key advantage of using pass by reference in a function?

Test your understanding of functions and recursion in C++.


Introduction

Variables and User Input

Simple Math

Conditional Statements

Loops

Functions and Recursion

C++ Exam 1

Pointers and Arrays

C++ Exam 2

Classes and Inheritance

Templates

C++ Exam 3

Wrap Up

Quiz: Functions and Recursion