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function, interpretInt, that queries the expression passed to it to see whether it is an integer. If it is, it prints the value of that integer; otherwise, it prints the string "not an int". #light open Microsoft.FSharp.Quotations open Microsoft.FSharp.Quotations.Typed let interpretInt exp = let uexp = to_raw exp in match uexp with | Raw.Int32 x -> printfn "%d" x | _ -> printfn "not an int" interpretInt 1 interpretInt 1 + 1 The results are as follows: 1 not an int We printed two expressions with interpretInt. The first was an integer value, so it printed out the value of that integer. The second was not an integer, although it contained integers. Quotations are a very big topic, and we can t cover them completely in this section or even in this book. You will, however, return to them in Meta-programming with Quotations in 11.

took a lot longer than I thought. We re now in 2006, and it s hard to believe how pathetic things are. We don t even have books online yet. I don t know why the world moves so slowly. Everybody says, Oh, it s moving so fast. And it s like, No, I don t think so. It s been forever.

On Windows XP, install IIS 5.1 as follows: 1. Open the Control Panel. 2. Click Add or Remove Programs, and then Add/Remove Windows Components. 3. Find Internet Information Services and check it. 4. Click Finish to exit the wizard.

Kahle: Having your own company means that it s much harder to blame some-

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body else. If you are working inside a big company, you can always blame management, marketing, engineering, or something. But, when you are running it, you can t, because it s all your responsibility. I found that to be quite cathartic. The East Coast also has a little more of an aesthetic of complaining, and so I got a little bit over that, I guess.

Another, I thought, was expressed really well by Don Yannias of Encyclopedia Britannica. He said, Now that I m running Encyclopedia Britannica, I have to be Mr. Sunshine every day. Because people are looking to you, not just for the ideas, but for the general attitude toward how to make the whole thing work. Carrying a company is a lot of weight. You have to make sure that you keep on the uptick not just financially, but also make it so that it s a fun environment and people want to work there.

In this chapter, you saw how to organize code in F#. You also saw how to comment, annotate, and quote code, but you just scratched the surface of both annotation and quoting. This concludes the tour of the F# core language. The rest of the book will focus on how to use F#, from working with relational databases to creating user interfaces, after you look at the F# core libraries in the next chapter.

Livingston: Did you have any competitors back in the WAIS days Kahle: There were other systems around, but one thing I tend to do is do some-

To install IIS on your Windows Server 2003, you ll need to first enable the application server components: 1. Click Start All Programs Administrative Tools Manage Your Server. 2. In the first window, click Add a Role. 3. A preliminary steps window will pop up. Review the information, and then click Next. 4. The Configure Your Server Wizard starts. Highlight Application Server in the list of server roles. 5. The Application Server Options dialog box appears. Make sure that Enable ASP .NET is checked, as shown in Figure 3-3. Then click Next to continue. 6. Review the list in the Summary of Selections dialog box to ensure that it reflects your intentions, and then click Next to continue. 7. Windows will now configure the server to include IIS functionality. You will most likely be prompted for your Windows 2003 installation CD. Drop the disc in and click OK to continue. After a moment, the installation will continue to completion.

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