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33 lines
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25.1.4.4 Seconds</H2> <P>
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One function, <A REL=DEFINITION HREF="f_sleep.htm#sleep"><B>sleep</B></A>, takes its argument as a non-negative <A REL=DEFINITION HREF="t_real.htm#real"><I>real</I></A> number of seconds. Informally, it may be useful to think of this as a <A REL=DEFINITION HREF="26_glo_r.htm#relative"><I>relative</I></A> <A REL=DEFINITION HREF="26_glo_u.htm#universal_time"><I>universal time</I></A>, but it differs in one important way: <A REL=DEFINITION HREF="26_glo_u.htm#universal_time"><I>universal times</I></A> are always non-negative <A REL=DEFINITION HREF="26_glo_i.htm#integer"><I>integers</I></A>, whereas the argument to <A REL=DEFINITION HREF="f_sleep.htm#sleep"><B>sleep</B></A> can be any kind of non-negative <A REL=DEFINITION HREF="t_real.htm#real"><I>real</I></A>, in order to allow for the possibility of fractional seconds. <P>
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<A REL=DEFINITION HREF="f_sleep.htm#sleep">sleep</A>
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<P><B>Figure 25-8. Defined names involving time in Seconds.</B> <P>
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