Explore C++ from scratch; gain insights into core concepts like loops, functions, and advanced topics such as inheritance and templates to become an intermediate-level C++ developer.

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

You'll start with a simple hello world program and proceed to cover core concepts such as conditional statements, loops, and functions in C++, before moving on to more advanced topics like inheritance, classes, and templates, along with much more.

By the time you're done, you'll be an intermediate level C++ developer, ready to take on your own projects.

Learn C++ from Scratch

A function needs function definition to perform a specific task.

A function needs function definition to perform a specific task.

If a function returns no value, the return type must be declared as void.

If a function returns no value, the return type must be declared as void.

A local variable declared in a function is usable out side that function.

A local variable declared in a function is usable out side 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 of the following is true when passing a variable by reference to a function in C++?


Which of the following 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.

Why would we use pass-by-reference instead of pass-by-value in a function?

Why would we use pass-by-reference instead of pass-by-value in a function?

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++ by taking this quiz.


Quiz on Functions and Recursion

Test your understanding of functions and recursion in C++ by taking this quiz.

Introduction

Variables & User Input

Simple Maths

Conditional Statements

Loops

Functions and Recursion

C++ Exam 1

Pointers & Arrays

C++ Exam 2

Classes and Inheritance

Templates

C++ Exam 3

Quiz on Functions and Recursion