Question:
> 我在老師的網頁下載了 fortran.zip 檔，解開壓縮之後只有 compiler ，
> 請問老師要去哪裡下載 fortran (用來寫程式的)？
> 謝謝！
> 
Answer:
you have to write it as a plain text
(with usual text editor, not WORD),
save it as a xxx.f or xxx.for, then compile it.
In a unix/Linux system, you can save it in either way.
In a MS DOS, you have to save it as xxx.for

there are some samle codes in my homepage as well.
( see also the 00readme file there )
xabc.for and abc.for
are a complete main progrem + subroutine.
try read the codes and compile them. 

In a unix/Linux system, you'll type 
f77 xabc.for abc.f

In a MS DOS, try
fl xabc.for abc.for

Question:
I did 
	do i=1,n
	sum = sum + 1/i
	enddo
in fortran, why does sum remain the same?

ANswer:
1/i is interger operatoin ans=0,
change it to 1./i