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| <tr><td width=20><td><b>MULDIV(3)</b><td align=right><b>MULDIV(3)</b> |
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| <p><font size=+1><b>NAME </b></font><br> |
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| muldiv, umuldiv – high-precision multiplication and division<br> |
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| <p><font size=+1><b>SYNOPSIS </b></font><br> |
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| <tt><font size=+1>#include <u.h><br> |
| #include <libc.h> |
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| <tt><font size=+1>long muldiv(long a, long b, long c) |
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| <tt><font size=+1>ulong umuldiv(ulong a, ulong b, ulong c)<br> |
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| <p><font size=+1><b>DESCRIPTION </b></font><br> |
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| <i>Muldiv</i> returns <tt><font size=+1>a*b/c</font></tt>, using a <tt><font size=+1>vlong</font></tt> to hold the intermediate result. |
| <i>Umuldiv</i> is the equivalent for unsigned integers. They can be used |
| to scale integer values without worry about overflowing the intermediate |
| result. |
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| On some architectures, these routines can generate a trap if the |
| final result does not fit in a <tt><font size=+1>long</font></tt> or <tt><font size=+1>ulong</font></tt>; on others they will |
| silently truncate.<br> |
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