The function is a block of statements that runs when it is called. The world of programming cannot exist without functions since they:

• are reusable.
• can test a particular part of your code.
• can be applied to a number of cases if you change the parameters.

Let’s go deep into it. For instance, you have decided to program the cat. It should say "meow!":

cout << "meow!" << endl;

Easy implementation. Repeating output will overload your code. However, what should we do if the cat must say meow twice or 20 times in different periods? In such a situation, we can use functions. To create a function, you need to specify the keyword void, the name of the function, followed by parentheses ():

void myFunc() {
    // code to be executed
}

Let's create the function sound() for the cat, which will print "meow!":

void sound() {
    cout << "meow!" << endl;
}