Time a function: Difference between revisions
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<pre>3</pre>
=={{header|ZX Spectrum Basic}}==
The ZX Spectrum has very little in the way of timing functionality; its best clock is the three-byte FRAMES variable, which starts at zero when the system is turned on and updates every time the ULA refreshes the screen, giving a granularity of one fiftieth of a second. As the system cannot multitask, a difference between the start and end time is as good as we can get; certain actions, most notably operating the system BEEPer, temporarily stop the counter.
<syntaxhighlight lang="zxbasic">
1 DEF FN t()=(PEEK 23672+256*PEEK 23673+65536*PEEK 23674)/50
10 LET time=FN t()
20 PRINT ASN 0.5
30 PRINT FN t()-time</syntaxhighlight>
{{out}}
<pre>0.52359878
0.22
0 OK, 30:1</pre>
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