Functions are a cornerstone of any programming language, and C++ is no exception. In this article, we will discuss the Tips for Writing Functions in C++ With Examples.

We’ll start with a brief introduction to functions and then move on to the different types of functions in C++. After that, we’ll give some examples of each type of function. Finally, we’ll wrap up with a few tips for writing functions in C++.

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Why Use Functions in C++?

Functions are an important part of C++ programming. They allow you to group related code together, making your code more organized and easier to understand.

When you write a function, you give it a name and then specify what type of input it takes and what type of output it produces. This makes it easy for other programmers to use your function, without having to guess how it works.

Let’s take a look at an example. Suppose you want to write a program that calculates the average of two numbers. You could write a function that looks like this:

int average(int first, int second) { return (first + second) / 2; }

This function takes two integers as input and returns an integer as output. Now, let’s suppose you want to use this function in another program. All you need to do is include the header file “average.h” and then call the function like this:

average(5, 6);

The computer will then calculate the average of 5 and 6 and return the result. Functions are important on Tips for Writing Functions in C++ With Examples

How to Write a Function in C++?

It’s really not that hard to write a function in C++. But there are a few things you need to keep in mind.

First, you need to decide what the function is going to do. That might seem like a no-brainer, but it’s not always as clear as it seems. For instance, if you’re writing a function to square a number, what does that mean? Do you square the number itself, or do you square the result of multiplying the number by itself?

Once you’ve decided what the function is supposed to do, you need to come up with a name for it. This can be anything you want, as long as it’s unique (no two functions can have the same name). The name should be descriptive, so that people know what the function does without having to look at the code.

Finally, you need to write the code for the function. This is probably the hardest part, but luckily there are plenty of resources out there to help you.

Types of Functions in C++

Functions in C++ can be classified into three types:

1. Mathematical functions: These are the functions that compute mathematical values. Some of the most common mathematical functions are sin(), cos(), and tan().

2. Logical functions: These are the functions that return a logical value (true or false) depending on the condition that is specified by the function. Some of the most common logical functions are !() and &&.

3. String functions: These are the functions that operate on strings. Some of the most common string functions are strcmp() and strcat().

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Defining a Function

When you’re writing functions in C++, it’s important to remember that they need to be defined before you can use them. This means that you can’t just type in a function name and expect it to work—you need to actually declare it first.

There are a few ways to do this. You can use the function keyword, or you can use the extern keyword if the function is defined elsewhere. You can also use the static keyword if the function is static, meaning that it doesn’t depend on any other objects.

Once you’ve defined your function, you need to give it some parameters. These are the variables that the function will use to do its job. The parameter list is enclosed in parentheses, and each parameter is separated from the next by a comma.

Finally, you need to write the function’s body, which is where the magic happens. The body contains the code that will be executed when the function is called. Functions are defined on Tips for Writing Functions in C++ With Examples

Calling a Function

Functions in C++ can be called from other functions, from within the main() function, or from other modules. When you call a function, you send it some information in the form of arguments.

The function then does something with that information and sends back a result. In this example, we’re going to calculate the square root of a number. We’ll call the function square_root(), and we’ll pass it an argument of 10.

We can call the function like this: square_root(10);

Or we can store the function call in a variable like this: result = square_root(10);

Then we can use the result wherever we want.

Examples of Functions in C++

Let’s take a look at some examples of functions in C++.

One of the most basic functions is the print() function. This function simply prints whatever you want it to print to the console.

Another common function is the square() function. This function takes a number as an input and squares it. So, for example, if you enter 5 into the square() function, it will return 25.

There are also functions that can be used to manipulate data. For example, the reverse() function takes a string as input and reverses it. So, if you enter “Hello” into the reverse() function, it will return “olleH”.


When you’re writing functions in C++, it’s important to remember the three essential components: the function prototype, the function definition, and the function call.

Each of these components plays an important role in ensuring that your functions run smoothly and error-free. So make sure to take the time to get familiar with each one before you start writing your own functions.