Now let's come back to that implicit none statement.
#Simply fortran 2 trial code
I'll simply say that my opinion on the matter is that you should first attempt to write the code in a way that the comment would be superfluous because the compiler doesn't check your comments. There is a lot of debate about how many comments should be included in most source code. These are called comments and anything following an exclamation point will be ignored by the compiler. You can also include content in your source code that the compiler will ignore. Again, that doesn't mean that you should ignore white space because as you can see, it can be quite helpful for human readers. Thus, the code on the left side here is equivalent to the code on the right. Additionally, white space is mostly insignificant. I recommend sticking to mostly lowercase for most things. That doesn't mean that you as the writer shouldn't be careful about how you use case because it can be very important to human readers. That means that each of these lines is exactly equivalent as far as a Fortran compiler is concerned. Let's also talk about another important feature of Fortran. Finally, if you have procedures you'd like to define in the program, they go at the end after a contained statement. This is where statements that actually do things go.
Once you've declared all your variables comes the meat of the program, the executable section. This is where variables are declared as well as a couple of other things that we won't really have time to discuss in this course. Next comes what in the standard is referred to as the specification section. There's some historical importance to this that I'll cover in a moment, but it comes after any use statements and before anything else. We'll cover them in more detail later in the course but they must be the first statements in a program if there are any. Fortran has modules and use statements are how you access stuff inside of them. The first program statement is optional but I'd recommend including it anyways. The only part here that is strictly required though is the end keyword. This is the basic structure of a Fortran program. Let's take a look at what they are and a few details about them. There are a variety of sections to a program and they must come in a specific order. In this lesson, we'll describe the basic structure of a Fortran program.
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