MACROMEDIA COLDFUSION 4.5-CFML LANGUAGE Bedienungsanleitung PDF herunterladen (Seite 37)

37Writing CFX Tags with Visual C++

Listing 30.7 (continued)

Standard deviation of the merchandise prices:

#NumberFormat(MerchStdDev, “0.00”)#

<emp>(numbers rounded to two decimal points)</emp>

</cfoutput>

</body>

</html>

Because the merchandise prices vary greatly (there are only about a dozen data points in the sample

database, but the prices range from $7.50 to $950.00), we will expect to see a relatively high stan-

dard deviation. Conversely, since the ﬁlm ratings vary only slightly (many of the rating values are

exactly the same from ﬁlm to ﬁlm, and the total range is only from 1 to 6), we will expect to see a

low standard deviation. Happily, the page generated by Listing 30.7 is consistent with these expec-

tations (Figure 30.10).

Other C++ Examples

Other examples of CFX tags created with C++ can be found in the CFusionMX7\cfx\examples folder

that gets installed automatically with ColdFusion. The examples include a

<CFX_DirectoryList>

tag that operates similarly to the built-in <cfdirectory> tag, and a <cfx_nt_userdb> tag that allows

you to add and remove users from a Windows domain or workgroup.

Figure 30.10

CFX tags can return

CFML variables that

can be displayed like

any other variable.

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MACROMEDIA COLDFUSION 4.5-CFML LANGUAGE Bedienungsanleitung Seite 37