How do I create a simple cubic in Fortran?

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hello friends;
I need help for creating a simple cubic in FORTRAN.
I have writing this program,but it doesn't work correctly.
please help me...

natom=27
x(natom),y(natom),z(natom)
x(1)=0
y(1)=0
z(1)=0
n=1
do i=1,3
do j=1,3
do k=1,3
rx(n)=x(1)+(i-1)a
ry(n)=y(1)+(j-1)a
rz(n)=z(1)+(k-1)a
n=n+1
end do

Posted 26-Feb-15 4:10am

azam1354

Updated 27-Feb-15 8:16am

nv3

v2

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CHill60 26-Feb-15 10:28am

Define what you mean by "doesn't work correctly"

azam1354 27-Feb-15 1:25am

It doesn't run in FORTRAN.

Stefan_Lang 27-Feb-15 2:08am

That doesn't really give us any more information.

Does it compile? link? Can you start the program? If it starts, what happens? If it doesn't work like you expected, what did you expect?

That is the kind of information we're looking for. Remember that we can't see what's in front of you, nor can we read your thoughts. We have no idea what you wish to accomplish, what kind of results or error messages you see, and pretty much no other information whatsoever that we can use to analyze the probelm. Heck, we can't even tell that there actually is a problem at all!

Sergey Alexandrovich Kryukov 26-Feb-15 10:37am

"Cubic" in English is adjective, not a noun. Cubic what?
—SA

azam1354 27-Feb-15 1:27am

I mean "cube" or "simple cubic".

Stefan_Lang 27-Feb-15 2:15am

A cube is a three dimensional objects with 6 square sides. Unless you're programming a 3D printer, that can't possibly be what you try to create. A 'cube' may also be a short expression for something else, but it's hard to guess what you mean without more information. At least, from looking at the code, I can't see what you are trying to achieve.

'cubic, like SA already stated, is an adjective. You might as well say "I want to create a red". And we will ask: "A red what?. And "simple red" doesn't help either...
So... a simple cubic what?

Stefan_Lang 26-Feb-15 10:47am

it's been a while I last worked in fortran, but you seem to be missing a declaration and initialization of the variable, a

azam1354 27-Feb-15 1:28am

thank you...
I will try again.

Stefan_Lang 27-Feb-15 2:19am

I also think you may need three lines of end do to end all three loops, unless the current version of Fortran works very differently from what I expect.

nv3 26-Feb-15 17:20pm

If you are looking for a Fortran solution why do you tag your question with C++?

azam1354 27-Feb-15 1:25am

Sorry, I can't create new tags & have to choose from existing.

CHill60 27-Feb-15 4:58am

I tried to retag one of their previous posts but it won't let you select Fortran. There's probably a message in there somewhere ;-p

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Stefan_Lang · Answer 1 · 2015-02-26T21:47:00

Since the code looks incomplete, even when considering I haven't worked with Fortran the last 25 years, I've checked this site: http://en.wikibooks.org/wiki/Fortran/Fortran_examples[^]

I've noticed two things:
1. Apparently there are considerable differences between the different versions of Fortran, so you better state what version you are using.
2. Your code is not a complete program in any version of Fortran. At the very least you didn't copy the boilerplate (program / end program). That's not a big issue, but if you don't provide the full program it's hard to tell whether your code is actually missing those bits or not.

And one more piece of advice: try some of the example programs from the site I linked above and verify they are working as intended. If not, there may be issues that are not related to your program code at all!