Simple program in Fortran, I get an error

[fluidistic]

It's not an assignment. Rather I'm trying to learn back some fortran.
I've found a website with some simple problems to do, that's where I got this one. See the first problem of this page : http://www.chem.ox.ac.uk/fortran/.

Here's my program :
Program vasy
implicit none

Integer :: C
Real :: F

C=0
F=0
do while (C<=100)
F=(9./5.)*C+32
C+1
write(*,*)C,F

end do


end program vasy

Here's the error I'm getting : "
C+1
1
Error: Unclassifiable statement at (1)
"
I know I didn't have to set F=0, but I tried several things in case the error was there... I can't get rid of the problem. My compiler is goftran and I'm under Ubuntu.

 

[fluidistic]

Nevermine, I just saw my problem. I had to write a=a+1 instead of just a+1.

Now I'm getting a permission denied when executing the program, but I think I'll solve it.
Thanks anyway!

 

[quicknote]

I would suggest checking the Fortran syntax and making sure all statements are properly structured and formatted. It is also important to check for any missing or incorrect punctuation marks, as they can cause errors in the program. Additionally, it may be helpful to review basic programming concepts and principles to better understand and troubleshoot the error. If the issue persists, it may be helpful to consult with a more experienced programmer or refer to online resources for further assistance.