FoxTrot

Iterating over a sequence of numbers is so common that C++, like most other programming languages, has a special syntax for it.

When we know exactly how many times we want to iterate (or when we are counting), we can use a for loop instead of a while loop:

for (int i = 0; i < 20; i++) 
{

  std::cout << "I will not throw paper airplanes in class.\n";

}

Let’s take a closer look at the first line:

for (int i = 0; i < 20; i++)

There are three separate parts to this separated by ;:

• The initialization of a counter: int i = 0
• The continue condition: i < 20
• The change in the counter (in this case an increment): i++

So here we are creating a variable i that starts from 0. We will repeat the code inside over and over again when i is less than 20. At the end the for loop, we are adding 1 to i using the ++ operator.