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<meta name="description" content="Exact base-10 fixed-point numbers for game economies — prices, balances and taxes on values like 0.10 that binary floating point cannot represent, so they…">
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<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
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<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <span class="here">Decimal</span></div>
<div class="item-head"><span class="kind-badge kind-namespace">namespace</span><h1 id="top">Decimal</h1></div>
<p class="ns-blurb">Exact base-10 fixed-point numbers for game economies — prices, balances and taxes on values like <code>0.10</code> that binary floating point cannot represent, so they always add up exactly. A <code>Decimal</code> is a <code>BigInt</code> mantissa with a decimal <code>scale</code> (the number of digits after the point), giving unbounded range and exact <code>add</code> / <code>sub</code> / <code>mul</code>. Build one with <code>Decimal.from</code> (an <code>int</code>) or <code>Decimal.parse</code> (text like <code>"19.99"</code>), compare with <code>cmp</code> / <code>eq</code>, change precision with <code>rescale</code> (truncates toward zero), read the current precision with <code>scale</code>, and render with <code>str</code>. Every operation is exact and deterministic. The runtime is spliced in only when a program mentions <code>Decimal.*</code> (or <code>BigInt.*</code>).</p>
<div class="ns-methods"><a class="ns-method" href="decimal-from.html"><code class="nm-sig">Decimal.from(value) -&gt; Decimal</code><span class="nm-tip">Turn a whole int into a Decimal.</span></a><a class="ns-method" href="decimal-parse.html"><code class="nm-sig">Decimal.parse(text) -&gt; Decimal</code><span class="nm-tip">Parse decimal text like "19.99".</span></a><a class="ns-method" href="decimal-add.html"><code class="nm-sig">Decimal.add(a, b) -&gt; Decimal</code><span class="nm-tip">Exact sum of two decimals.</span></a><a class="ns-method" href="decimal-sub.html"><code class="nm-sig">Decimal.sub(a, b) -&gt; Decimal</code><span class="nm-tip">Exact difference of two decimals.</span></a><a class="ns-method" href="decimal-mul.html"><code class="nm-sig">Decimal.mul(a, b) -&gt; Decimal</code><span class="nm-tip">Exact product of two decimals.</span></a><a class="ns-method" href="decimal-neg.html"><code class="nm-sig">Decimal.neg(a) -&gt; Decimal</code><span class="nm-tip">Negate a decimal.</span></a><a class="ns-method" href="decimal-cmp.html"><code class="nm-sig">Decimal.cmp(a, b) -&gt; int</code><span class="nm-tip">Compare two decimals: -1, 0, or 1.</span></a><a class="ns-method" href="decimal-eq.html"><code class="nm-sig">Decimal.eq(a, b) -&gt; bool</code><span class="nm-tip">True when two decimals are equal in value.</span></a><a class="ns-method" href="decimal-scale.html"><code class="nm-sig">Decimal.scale(d) -&gt; int</code><span class="nm-tip">The number of digits after the point.</span></a><a class="ns-method" href="decimal-rescale.html"><code class="nm-sig">Decimal.rescale(d, places) -&gt; Decimal</code><span class="nm-tip">Change precision (truncates toward zero).</span></a><a class="ns-method" href="decimal-str.html"><code class="nm-sig">Decimal.str(d) -&gt; string</code><span class="nm-tip">Render a decimal as text.</span></a></div>
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