LAB #1

Objectives

• The Development Environment

The Home Environment

The following additional download is optional:

You can of course create programs using any editor, or even a word processor, as long as you can save the file in text format with the extension you want. Notepad, for example, uses text but insists on using the txt extension (unless you override by double-quoting), and MS-Word allows any extension but saves in a propriety doc format (unless you override by specifying text format). Ideally, however, the editor knows that you are writing programs, not sentences and paragraphs, and thus offers services like: Highlighting keywords, operators, literals, and other language-specific features; block indent and un-indent; support user-defined tab stops; display line numbers; plus a host of standard services, like opening multiple files, spell checking, editing text, and so on. One freeware editor that meets the above requirements is Crimson (http://www.crimsoneditor.com) and here are step-by-step instructions for its download and configuration:

• Download this file (1,253,038 bytes) and store in on your desktop. You can delete it once the installation is completed.
• Execute the file by double-clicking it.
• Select to install the editor itself plus the Start Menu and desktop shortcuts.
• Accept the default installation directory by clicking Install
• Launch the editor using its shortcut or Start Menu command.
• Under Tools | Preferences, in the General category, set the Tab size to 3, and check the boxes for Highlight matching pairs and Enable auto indent.
• Drop the View menu and ensure Line Numbers is checked (or else select it).
• Under View | Toolbar/Window make sure only the first three entries are checked; i.e. we do not want to see neither the directory nor the output windows.
• Under Tools | Preferences | Fonts, choose a font that you are comfortable with (after all, you will be spending long hours looking at it). I like Courier New, size 10.
• Exit the editor and re-launch it. Ensure your configuration was saved.

The Campus Environment

The Setup

1. Start MS-DOS. You do this by finding the Command Prompt under Start | Programs. In some Windows version, it is under "accessories".
2. At the MS-DOS prompt, type Edit.
3. Click the Windows Start button again. If Start is not visible, simply press Ctrl-Esc to open it.
4. If you are working in a campus lab, select Start | Programs | MS-DOS Applications | COSC1540 Fortran. This will prepare the compiler and leave you at the F:\ prompt.
   If working at home, choose the MS-DOS Command Prompt again and in its window, type: cd \F\York
5. Note that the above steps allow you to have two tasks running in two separate windows: one for the editor and one for the compiler. Windows allows you to switch from task to another by repeatedly pressing Alt-Tab; i.e. press the Tab key while holding down the (left or right) alt key.
6. Press Alt-Tab to switch to the Edit window.
7. Type the following program exactly as shown:

   program Convert
   implicit none
   ! -----------------------------------------------Declare
   real*4 tempC, tempF, FACTOR
   integer*2 ZERO_SHIFT
   parameter (ZERO_SHIFT = 32, FACTOR = 5./9.)
   ! -----------------------------------------------Input
   print*, "Enter the temperature in Fahrenheit ..."
   read*, tempF
   ! -----------------------------------------------Compute
   tempC = FACTOR * (tempF - ZERO_SHIFT)
   ! -----------------------------------------------Output
   print*, "The corresponding Centigrade temperature is "
   print*, tempC, " degrees."
   end
   

8. Save the program by choosing File|Save. Since this is the first time you save this file, you will be prompted for a filename. If you are in a campus lab, save the file by supplying the name Lab1.FOR (this will save it in your F:\ directory). At home, save it in the \F\York by typing: \F\York\Lab1.FOR.
9. Compile the program: switch to the other open DOS window by pressing Alt-Tab. There, type the command:
   f2exe Lab1
10. If compilation (syntax) errors were detected, an executable file will not be generated and you will see errors and corresponding line numbers shown. In that case, you will need to go back to the editor and fix the errors.
11. Run the program. Simply type Lab1 at the DOS prompt. This works because a file named Lab1.EXE has been created.

Lab Checking