Show how to declare multiple variables of the same type in one line

[Beliavsky]

The tutorial says

The syntax for declaring variables is:

<variable_type> :: <variable_name>
where <variable_type> is one of the built-in variable types listed above and <variable_name> is the name that you would like to call your variable.

In even the smallest programs one may have several variables of the same type, so I think it is worth introducing the syntax for this at the beginning. So the above could be changed to

The syntax for declaring variables is:

<variable_type> :: <variable_name_1>, <variable_name_2>
where <variable_type> is one of the built-in variable types listed above and <variable_name_1> and <variable_name_2> are the names that you would like to call your variables.

Then in the illustrative program

program arithmetic
  implicit none

  real :: pi
  real :: radius
  real :: height
  real :: area
  real :: volume

the declarations can be consolidated to one line. Modern Fortran has been criticized as verbose -- I think concise syntax should be used when it does not sacrifice clarity.

A nitpick about the code is that the line

area = pi * radius**2.0

should be

area = pi * radius**2

When you want to raise a value to an exact integer power, you should not write the exponent as a float.

Typo -- "running" not "runnning" (2 not 3 n's) at https://fortran-lang.org/learn/quickstart/arrays_strings .

[arjenmarkus]

I agree with these observations (should we add a comment about the difference between integer and real exponents?)