Undefined values: Difference between revisions
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=={{header|Phix}}== |
=={{header|Phix}}== |
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{{libheader|Phix/basics}} |
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Phix has a special unassigned value, that can be tested for using object(). (There is no offical way to "un-assign" a variable, though you could fairly easily do so with a bit of inline assembly.) |
Phix has a special unassigned value, that can be tested for using object(). (There is no offical way to "un-assign" a variable, though you could fairly easily do so with a bit of inline assembly.) |
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<lang Phix> |
<!--<lang Phix>--> |
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<span style="color: #004080;">object</span> <span style="color: #000000;">x</span> |
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procedure test() |
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<span style="color: #008080;">procedure</span> <span style="color: #000000;">test</span><span style="color: #0000FF;">()</span> |
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if object(x) then |
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<span style="color: #008080;">if</span> <span style="color: #004080;">object</span><span style="color: #0000FF;">(</span><span style="color: #000000;">x</span><span style="color: #0000FF;">)</span> <span style="color: #008080;">then</span> |
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puts(1,"x is an object\n") |
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<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"x is an object\n"</span><span style="color: #0000FF;">)</span> |
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else |
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<span style="color: #008080;">else</span> |
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puts(1,"x is unassigned\n") |
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<span style="color: #7060A8;">puts</span><span style="color: #0000FF;">(</span><span style="color: #000000;">1</span><span style="color: #0000FF;">,</span><span style="color: #008000;">"x is unassigned\n"</span><span style="color: #0000FF;">)</span> |
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end if |
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<span style="color: #008080;">end</span> <span style="color: #008080;">if</span> |
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end procedure |
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<span style="color: #008080;">end</span> <span style="color: #008080;">procedure</span> |
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test() |
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<span style="color: #000000;">test</span><span style="color: #0000FF;">()</span> |
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x = 1 |
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<span style="color: #000000;">x</span> <span style="color: #0000FF;">=</span> <span style="color: #000000;">1</span> |
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<span style="color: #000000;">test</span><span style="color: #0000FF;">()</span> |
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{{out}} |
{{out}} |
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<pre> |
<pre> |
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