General
This folder is designed to set up watcom, the command window and the watcom ide. The hello code is introduced in FORTRAN, then in C.
Watcom
Watcom is free and available from
http://www.openwatcom.org
Version 1.3 includes both C and FORTRAN.
The most recent version 1.9 has a separate download for C and for
FORTRAN. Install complete versions of
both. The codes here are mostly FORTRAN,
with frequent C and C++ versions.
Openwatcom allows the same IDE to make executables for all three and for
relatively easy mixing of the codes.
Command Line
Figure 1 Screen dump of this folder in Windows 10
If you are running windows 10, the command prompt is available by right clicking of the dark blue file. If you have an older operating system, go to start, at the bottom find all programs, go to accessories and copy command prompt. Paste it into this folder. Right click on it and open properties. Remove the line with %HOMEDRIVE%%HOMEPATH%, click on apply. Now when you click on it, it will open in this folder.
Watcom ide
Installation of Watcom puts \watcom\binnt in the path. This means that in command mode, the command ide opens a window
Go to file and request a new project.
Figure 2 The new project window
The up arrow and the selection of location enables the code to reach the hello folder. Change the name noname.wpj to helloF.wpj
Figure 3 Project options
Accept the defaults. Click on sources in the version of figure 1 that appears next. On the add line type in hellof.for and click add, then close.
FORTRAN
Figure 1 now has [.for] at the top of what was blank space, followed by hellof.for [n/a]. It is the for that lets the ide know that this is a FORTRAN code. Do not let the [n/a] bother you. Click on hellof.for and enter the code.
Figure 4 The hello codein FORTRAN.
The first line says hello, the second keeps the run window open so that we can seetheresult of the first line. The rather obsolete diskette saves the code. The hammer brings the ide to the top. The [n/a] is gone. The fifth symbol across the top of figure 1, compiles the source code. The sixth compiles and links all source code. First click on options, then FORTRAN options.
Figure 5 diagnostic switches
The four switches checked were defaulted to off. For debugged code, off iscorrect.
Figure 6 debugging changed from full to line number information.
The use of line numberinformation and the previous debug switches slows the codeby more than a factor of 10. Optimization options are on the next few pages. Optimize for speed.
Save these changes, click on the sixth compile and link page to bring up the ide log.
Figure 7 the ide log.
Read the log carefully. This is the best place to catch errors. Click on the running figure.
Figure 8 dos from the ide
Unfortunately, the run time errors do not get to this window. It just closes. Go back to command mode.
>hellof
hellofrom fortran
1
In this mode, the
errors will show up including the line on which they occurred. The option choices indicate that debugging
information has been suppressed. The
suppressed information is not normally needed.
C
Figure 9 The IDE with a C sourceindicated.
The name.c tells the ide that this is C code.
Figure 10 The C code
Figure 11 the preferred options.
Figure 12 The run window
From the command line
>helloc
Hello from C
37
c1 = 3