| Re: Passing zero as a Parameter/ NOT KEYWORD_SET [message #16081 is a reply to message #16071] |
Tue, 29 June 1999 00:00   |
R.Bauer
Messages: 1424
Registered: November 1998
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Senior Member |
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<h1>
<a NAME="SECTION00270000000000000000"></a>1.7 TRAINING</h1>
<ul>
<li>
Look carefully at the given functions:</li>
<ul>
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<td>
<pre>FUNCTION test1,minimum=min_val
IF KEYWORD_SET(min_val) THEN RETURN,1 ELSE RETURN,0
END
</pre>
</td>
</tr>
<caption ALIGN=BOTTOM><b>Example 1.21:</b> test1</caption>
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<tr>
<td>
<pre>FUNCTION test2,minimum=min_val
IF ARG_PRESENT(min_val) THEN RETURN,1 ELSE RETURN,0
END
</pre>
</td>
</tr>
<caption ALIGN=BOTTOM><b>Example 1.22:</b> test2</caption>
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<table BORDER WIDTH="80%" BGCOLOR="#FFFFAA" >
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<pre>FUNCTION test3,minimum=min_val
IF N_ELEMENTS(min_val) GT 0 THEN RETURN,1 ELSE RETURN,0
END
</pre>
</td>
</tr>
<caption ALIGN=BOTTOM><b>Example 1.23:</b> test3</caption>
</table>
</ul>
<p><br>Your results:
<br>
<table BORDER CELLPADDING=3 BGCOLOR="#FFFFAA" >
<tr VALIGN=TOP>
<td ALIGN=LEFT NOWRAP>call:</td>
<td ALIGN=LEFT NOWRAP>test1</td>
<td ALIGN=LEFT NOWRAP>test2</td>
<td ALIGN=LEFT NOWRAP>test3</td>
</tr>
<tr VALIGN=TOP>
<td ALIGN=LEFT NOWRAP><tt>PRINT, testX( )</tt></td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
</tr>
<tr VALIGN=TOP>
<td ALIGN=LEFT NOWRAP><tt>PRINT, testX(minimum=0)</tt></td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
</tr>
<tr VALIGN=TOP>
<td ALIGN=LEFT NOWRAP><tt>PRINT, testX(minimum=10)</tt></td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
</tr>
<tr VALIGN=TOP>
<td ALIGN=LEFT NOWRAP><tt>PRINT, testX(minimum=-10)</tt></td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
</tr>
<tr VALIGN=TOP>
<td ALIGN=LEFT NOWRAP><tt>mv=0 & PRINT, testX(minimum=mv)</tt></td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
</tr>
<tr VALIGN=TOP>
<td ALIGN=LEFT NOWRAP><tt>mv=10 & PRINT, testX(minimum=mv)</tt></td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
<td ALIGN=LEFT NOWRAP> </td>
</tr>
<tr>
<td><tt>PRINT, testX(minimum=mv)</tt></td>
<td> </td>
<td> </td>
<td> </td>
</tr>
</table>
</ul>
<center>
<address>
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