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    <p>Lua as usually configured uses your platform's usual double-precision floating point format to store all numbers. For <em>most</em> desktop platforms today, that will be the 64-bit IEEE-754 format. The <a href="http://lua-users.org/wiki/FloatingPoint" rel="noreferrer">conventional wisdom</a> is that integers in the range -1E15 to +1E15 can be safely assumed to be represented exactly.</p> <p>In any case, the <a href="http://www.lua.org/manual/5.1/manual.html#pdf-string.format" rel="noreferrer"><code>string.format()</code></a> function passes its arguments through (with some minor tweaks) to the platform's implementation of <a href="http://www.cplusplus.com/reference/clibrary/cstdio/printf/" rel="noreferrer"><code>printf()</code></a>. The format string understood by <code>printf()</code> includes <code>%e</code> and <code>%E</code> to force "scientific" notation, and <code>%f</code> to force plain decimal notation. In addition, <code>%g</code> and <code>%G</code> choose the shortest notation.</p> <p>For example:</p> <pre> E:\...>lua Lua 5.1.4 Copyright (C) 1994-2008 Lua.org, PUC-Rio > a = 1e17/3 > print(string.format("%f",a)) 33333333333333332.000000 > print(string.format("%e",a)) 3.333333e+016 > print(string.format("%.0f",a)) 33333333333333332 </pre> <p>Note that if the value fits within a 32-bit signed integer range, you can also use the <code>%d</code> format. However, results are not well defined if the value exceeds that range. System timestamps in microseconds are likely to exceed the 32-bit range.</p> <p>If 16 decimal digits is not enough precision, there are several choices available for increased precision. </p> <p>First, it would not be difficult to package a true 64-bit integer in a <code>userdata</code> along with a suitable set of arithmetic metamethods. This gets discussed occasionally on the <a href="http://www.lua.org/lua-l.html" rel="noreferrer">Lua mailing list</a>, but I don't recall seeing a completed module released by anyone.</p> <p>Second, one of the Lua authors has released two modules supporting arbitrary precision arithmetic: <a href="http://www.tecgraf.puc-rio.br/~lhf/ftp/lua/" rel="noreferrer">lbc and lmapm</a>. Both are found at that page.</p> <p>Third, casual searching in Google readily turns up several other math library wrappers.</p>
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    1. POHow can I print a huge number in Lua without using scientific notation?
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