[Swift-user] tutorial/understanding issue 7

[Daniel S. Katz]

Hi,

Continuing my journey through the Swift tutorial (http://www.ci.uchicago.edu/swift/guides/tutorial.php), though the previous 6 messages are waiting for approval, as I was not a member of the swift-users list when I sent them...

In section 3.5, why can't I do this:


type messagefile;

app (messagefile t) greeting (string s[]) {
    echo s[0] s[1] s[2] stdout=@filename(t);
}

messagefile outfile <"q5out.txt">;

#string words[] = ["how","are","you"];
string words[];
words[0] = "how;
words[1] = "are";
words[2] = "you";

outfile = greeting(words);


is the issue that swift doesn't know how large to make words[]?

I also tried:

string words[3];

but this also didn't work.

Do strings need to be assigned when they are declared?  Is this a general rule for Swift variables?

I guess part of the reason this is confusing me is I see the following in the Swift userguide, which seems to declare an array before assigning any of its elements.


file a[];  
file b[];  
foreach v,i in a {  
  b[i] = p(v);  
}  
a[0] = r();  
a[1] = s();  



Thanks,
Dan



-- 
Daniel S. Katz
University of Chicago
(773) 834-7186 (voice)
(773) 834-3700 (fax)
d.katz at ieee.org or dsk at ci.uchicago.edu
http://www.ci.uchicago.edu/~dsk/




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