93 lines
5.2 KiB
HTML
93 lines
5.2 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<title>HUGE_VALF, HUGE_VAL, HUGE_VALL</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_numeric_math_HUGE_VAL skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">HUGE_VALF, HUGE_VAL, HUGE_VALL</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-numeric.html">numeric</a>‎ | <a href="cpp-numeric-math.html">math</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<div>定义于头文件 <code><a href="cpp-header-cmath.html"><cmath></a></code></div>
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<td></td>
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<td></td>
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<tr class="t-dcl t-since-cxx11">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="co2">#define HUGE_VALF /*implementation defined*/</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<div><span class="mw-geshi cpp source-cpp"><span class="co2">#define HUGE_VAL /*implementation defined*/</span></span></div>
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<tr class="t-dcl t-since-cxx11">
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<td>
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<div><span class="mw-geshi cpp source-cpp"><span class="co2">#define HUGE_VALL /*implementation defined*/</span></span></div>
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</td>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx11">(C++11 起)</span></td>
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<p><code>HUGE_VALF</code> 、 <code>HUGE_VAL</code> 和 <code>HUGE_VALL</code> 宏展开成正浮点常量表达式，它们比较等于上溢情况中浮点函数和运算符的返回值（见 <a href="cpp-numeric-math-math_errhandling.html"><tt>math_errhandling</tt></a> ）。</p>
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<table class="t-dsc-begin">
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<tr class="t-dsc-hitem">
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<td>常量</td>
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<td>解释</td>
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</tr>
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<tr class="t-dsc">
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<td><code>HUGE_VALF</code></td>
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<td>展开成指示上溢的正 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span></span></span> 表达式</td>
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<tr class="t-dsc">
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<td><code>HUGE_VAL</code></td>
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<td>展开成指示上溢的正 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span></span></span> 表达式，不必可表示为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span></span></span></td>
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</tr>
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<tr class="t-dsc">
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<td><code>HUGE_VALL</code></td>
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<td>展开成指示上溢的正 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 表达式，不必可表示为 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span></span></span> 或 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span></span></span></td>
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</tr>
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<p>在支持浮点无穷大的平台上，这些宏始终分别展开成 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span></span></span> 、 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">double</span></span></span> 和 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">long</span> <span class="kw4">double</span></span></span> 的正无穷大。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<div class="t-dsc-member-div">
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<div><a href="cpp-numeric-math-INFINITY.html"><span class="t-lines"><span>INFINITY</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-cxx11">(C++11)</span></span></span></div>
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</div>
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</td>
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<td>求值为正无穷大或保证使 <span class="t-c"><span class="mw-geshi cpp source-cpp"><span class="kw4">float</span></span></span> 上溢的值<br />
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<span class="t-mark">(宏常量)</span></td>
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