Error compiling with gfortran (from a beginner)

See the other recent thread about this.

http://forums.macrumors.com/showthread.php?t=1006986

You code compiles and runs perfectly with gfortran installed from the links provided there.

EDIT:

Looks like you may only have downloaded an updater of sorts.

Assumptions:
Your source file is in ~/Documents/hello.f90
gcc-snwleo-intel-bin.tar.gz has been downloaded as ~/Downloads/gcc-snwleo-intel-bin.tar.gz

Code:

$ cd /
$ sudo tar zxvf ~/Downloads/gcc-snwleo-intel-bin.tar.gz
$ cd ~/Documents
$ gfortran -o hello hello.f90
$ ./hello
 Hello!

EDIT 2: Why (as a beginning programmer) are you trying to learn FORTRAN? Are you an engineering student?

B

 

Not degrading, per se, but not a very good language for a beginner unless they have some very specific needs.

It's kind of like deciding to learn a second language and picking Latin.

B

 

Yeah I meant exactly that with "unless they have some very specific needs." I was seeking to suss that out from the OP as to why they chose FORTRAN to learn programming.

Having spent much of the past couple of years dealing with MATLAB code, I find it far superior to FORTRAN for most numerical stuff, especially linear algebra.

Both of which have their uses too.

B

 

What chown33 says is right. I was assuming that you were running 10.6 on an Intel Mac. If not, you need to step back and figure out the basics first.

If you don't know which Mac you have, use -> About this Mac -> More Info and report back the Model Identifier. Your OS version is available from -> About this Mac -> Software -> System Version. Xcode version is available from Xcode -> About Xcode. Start there.

NOTE: I'm a physicist myself, though working in EE, and I tend to use MATLAB for most of my numerical needs these days, but I maintain some code in C/C++. I haven't used FORTRAN for much since the mid 90s. GNU Octave would probably be my choice if I couldn't have MATLAB. Even Excel works for simple stuff that in the not too distant past required code. If I'm interfacing to lab equipment I would do that in LabView or MATLAB too, and definitely not FORTRAN.

An indication of the direction things have gone, is that the venerable Numerical Recipes book, that used to be FORTRAN based translated to other languages is now C++ based only in the current third edition. http://www.nr.com/.

Since you have a Mac, here's a resource for technical programming using the Mac. http://www.macresearch.org/cocoa_for_scientists that may be of interest to you.

B

 

I'd put it this way:

• If you want to learn to code to get things done: Learn MATLAB/Octave or use Excel/R for data analysis.
• If you just want to learn to code: Learn C/C++ using gcc then add an IDE (Xcode/Eclipse/...)
• When the time comes for you need to use a particular library or write code for a supercomputer, then learn FORTRAN.

As a beginner, you want to be able to get help from as many places as you can, so you want to learn something that is widely used and many folks are familiar with. C/C++ is exactly that, and many of the things you learn can be useful later wen you do move to FORTRAN or another language.

You can actually learn a lot about writing code just by building spreadsheets in Excel.

(NOTE: My age is showing as I still capitalize FORTRAN and I suddenly feel the urge to write in all caps and start each line exactly at character 8 ).

B

 

Say no more. You will definitely ultimately need to learn FORTRAN at some point.

Aside: Any reason you are sticking with 10.4? I have an iMac that is also a Core Duo from 2006 and it runs 10.6 very nicely. Though I did already have 2 GB of RAM. It was worth $29 just to eliminate the PPC code from the HDD.

B