100162741.htm

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            <p class="a2"><span style="FONT-FAMILY: 黑体">名称</span></p>
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            <p class="a2"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">CTS</span><span style="FONT-FAMILY: 黑体">类型</span></p>
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            <p class="a2"><span style="FONT-FAMILY: 黑体">说</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">&nbsp; </span><span style="FONT-FAMILY: 黑体">明</span></p>
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            <p class="a2"><span style="FONT-FAMILY: 黑体">位</span><span style="FONT-FAMILY: 'Times New Roman'"> </span><span style="FONT-FAMILY: 黑体">数</span></p>
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            <p class="a2"><span style="FONT-FAMILY: 黑体">范围</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'"> (</span><span style="FONT-FAMILY: 黑体">大致</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">)</span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span lang="EN-US">float</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">System.Single</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">32</span><span style="FONT-FAMILY: 宋体">位单精度浮点数</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">7</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">&plusmn;1.5 &times; 10<sup>-45</sup> </span><span style="FONT-FAMILY: 宋体">到</span><span lang="EN-US"> &plusmn;3.4 &times; 10<sup>38</sup></span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span lang="EN-US">double</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">System.Double</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">64</span><span style="FONT-FAMILY: 宋体">位双精度浮点数</span></p>
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            <p class="a4" style="MARGIN-LEFT: 0cm"><span lang="EN-US">15/16</span></p>
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            <p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">&plusmn;5.0 &times; 10<sup>-324</sup></span><span style="FONT-FAMILY: 宋体">到</span><span lang="EN-US"> &plusmn;1.7 &times; 10<sup>308</sup></span></p>
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<p class="MsoNormal"><span lang="EN-US">&nbsp;</span></p>
<p class="MsoNormal"><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">数据类型用于较小的浮点数，因为它要求的精度较低。</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">数据类型比</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">数据类型大，提供的精度也大一倍</span><span lang="EN-US">(15</span><span style="FONT-FAMILY: 宋体">位</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如果在代码中没有对某个非整数值</span><span lang="EN-US">(</span><span style="FONT-FAMILY: 宋体">如</span><span lang="EN-US">12.3)</span><span style="FONT-FAMILY: 宋体">硬编码，则编译器一般假定该变量是</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">。如果想指定值为</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">，可以在其后加上字符</span><span lang="EN-US">F(</span><span style="FONT-FAMILY: 宋体">或</span><span lang="EN-US">f)</span><span style="FONT-FAMILY: 宋体">：</span></p>
<p class="2" style="MARGIN: 8.15pt 0cm 8.15pt 21.45pt; TEXT-INDENT: 18.45pt"><span lang="EN-GB">float f = 12.3F;</span></p>
<h4 style="TEXT-INDENT: 21.45pt"><span lang="EN-GB">3. </span><span lang="EN-US">d</span><span lang="EN-GB">ecimal</span><span style="FONT-FAMILY: 黑体">类型</span></h4>
<p class="MsoNormal"><span><span style="FONT-FAMILY: 宋体">另外</span></span><span style="FONT-FAMILY: 宋体">，</span><span lang="EN-US">decimal</span><span style="FONT-FAMILY: 宋体">类型表示精度更高的浮点数</span><span style="FONT-FAMILY: 宋体">，</span><span style="FONT-FAMILY: 宋体">如表</span><span lang="EN-US">2-3</span><span style="FONT-FAMILY: 宋体">所示。</span></p>
<p class="a5" style="MARGIN-TOP: 8.15pt"><span style="FONT-FAMILY: 黑体">表</span><span lang="EN-US">&nbsp; 2-3</span></p>
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            <p class="a2"><span style="FONT-FAMILY: 黑体">名</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">&nbsp;&nbsp;&nbsp; </span><span style="FONT-FAMILY: 黑体">称</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 80.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="107">
            <p class="a2"><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">CTS</span><span style="FONT-FAMILY: 黑体">类型</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 105.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="140">
            <p class="a2"><span style="FONT-FAMILY: 黑体">说</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">&nbsp;&nbsp;&nbsp; </span><span style="FONT-FAMILY: 黑体">明</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 58.85pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="78">
            <p class="a2"><span style="FONT-FAMILY: 黑体">位</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">&nbsp; &nbsp;&nbsp;</span><span style="FONT-FAMILY: 黑体">数</span></p>
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            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: windowtext 1pt solid; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 126.7pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="169">
            <p class="a2"><span style="FONT-FAMILY: 黑体">范围</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">(</span><span style="FONT-FAMILY: 黑体">大致</span><span lang="EN-US" style="FONT-FAMILY: 'Times New Roman'">)</span></p>
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