100165821.htm

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            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">short</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">long</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">decimal</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="156">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">byte</span></p>
            </td>
            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 326.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="435">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">short</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">ushort</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">uint</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">long</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">ulong</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">decimal</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="156">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">short</span></p>
            </td>
            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 326.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="435">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">long</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">decimal</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="156">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">ushort</span></p>
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            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 326.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="435">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">uint</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">long</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">ulong</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">decimal</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="156">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">int</span></p>
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            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 326.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="435">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">long</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">decimal</span></p>
            </td>
        </tr>
        <tr>
            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="156">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">uint</span></p>
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            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 326.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="435">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">long</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">ulong</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">decimal</span></p>
            </td>
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        <tr>
            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="156">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">long</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">ulong</span></p>
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            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 326.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="435">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">decimal</span></p>
            </td>
        </tr>
        <tr>
            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="156">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">float</span></p>
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            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 326.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="435">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">double</span></p>
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            <td style="BORDER-RIGHT: windowtext 1pt solid; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 117.2pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="156">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">char</span></p>
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            <td style="BORDER-RIGHT: medium none; PADDING-RIGHT: 9.9pt; BORDER-TOP: medium none; PADDING-LEFT: 9.9pt; PADDING-BOTTOM: 0cm; BORDER-LEFT: medium none; WIDTH: 326.1pt; PADDING-TOP: 0cm; BORDER-BOTTOM: windowtext 1pt solid" valign="top" width="435">
            <p class="a4" style="MARGIN-LEFT: 10.7pt; LINE-HEIGHT: 13.5pt"><span lang="EN-US">ushort</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">uint</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">long</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">ulong</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">decimal</span></p>
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<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">注意，只能从较小的整数类型隐式地转换为较大的整数类型，不能从较大的整数类型隐式地转换为较小的整数类型。也可以在整数和浮点数之间转换，其规则略有不同，可以在相同大小的类型之间转换，例如</span><span lang="EN-US">int/uint</span><span style="FONT-FAMILY: 宋体">转换为</span><span lang="EN-US"> float</span><span style="FONT-FAMILY: 宋体">，</span><span lang="EN-US">long/ulong</span><span style="FONT-FAMILY: 宋体">转换为</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">，也可以从</span><span lang="EN-US">long/ulong</span><span style="FONT-FAMILY: 宋体">转换回</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">。这样做可能会丢失</span><span lang="EN-US">4</span><span style="FONT-FAMILY: 宋体">个字节的数据，但这仅表示得到的</span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">值比使用</span><span lang="EN-US">double</span><span style="FONT-FAMILY: 宋体">得到的值精度低，编译器认为这是一种可以接受的错误，而其值的大小是不会受到影响的。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">无符号的变量可以转换为有符号的变量，只要无符号的变量值的大小在有符号的变量的范围之内即可。</span></p>
<h4 style="TEXT-INDENT: 21.45pt"><span lang="EN-US">2. </span><span style="FONT-FAMILY: 黑体">显式转换方式</span></h4>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">有许多场合不能隐式地转换类型，否则编译器会报告错误。下面是不能进行隐式转换的一些场合：</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -37.55pt"><span lang="EN-GB"><span class="msoIns"><ins cite="mailto:Simon%20Robinson" datetime="2001-06-10T23:28">●<span style="FONT: 7pt 'Times New Roman'">&nbsp;&nbsp; </span></ins></span></span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">转换为</span><span lang="EN-US">short</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.5pt">&mdash;&mdash;</span><span style="LETTER-SPACING: -0.5pt"> </span><span style="FONT-FAMILY: 宋体">会丢失数据</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -37.55pt"><span lang="EN-GB"><span class="msoIns"><ins cite="mailto:Simon%20Robinson" datetime="2001-06-10T23:28">●<span style="FONT: 7pt 'Times New Roman'">&nbsp;&nbsp; </span></ins></span></span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体">转换为</span><span lang="EN-US">uint</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.5pt">&mdash;&mdash;</span><span style="LETTER-SPACING: -0.5pt"> </span><span style="FONT-FAMILY: 宋体">会丢失数据</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -37.55pt"><span lang="EN-GB"><span class="msoIns"><ins cite="mailto:Simon%20Robinson" datetime="2001-06-10T23:28">●<span style="FONT: 7pt 'Times New Roman'">&nbsp;&nbsp; </span></ins></span></span><span lang="EN-US">uint</span><span style="FONT-FAMILY: 宋体">转换为</span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.5pt">&mdash;&mdash;</span><span style="LETTER-SPACING: -0.5pt"> </span><span style="FONT-FAMILY: 宋体">会丢失数据</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -37.55pt"><span lang="EN-GB"><span class="msoIns"><ins cite="mailto:Simon%20Robinson" datetime="2001-06-10T23:28">●<span style="FONT: 7pt 'Times New Roman'">&nbsp;&nbsp; </span></ins></span></span><span lang="EN-US">float</span><span style="FONT-FAMILY: 宋体">转换为</span><span lang="EN-US">int</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.5pt">&mdash;&mdash;</span><span style="LETTER-SPACING: -0.5pt"> </span><span style="FONT-FAMILY: 宋体">会丢失小数点后面的所有数据</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -37.55pt"><span lang="EN-GB"><span class="msoIns"><ins cite="mailto:Simon%20Robinson" datetime="2001-06-10T23:28">●<span style="FONT: 7pt 'Times New Roman'">&nbsp;&nbsp; </span></ins></span></span><span style="FONT-FAMILY: 宋体">任何数字类型转换为</span><span lang="EN-US">char</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: -0.5pt">&mdash;&mdash;</span><span style="LETTER-SPACING: -0.5pt"> </span><span style="FONT-FAMILY: 宋体">会丢失数据</span></p>
<p class="1" style="MARGIN-LEFT: 37.55pt; TEXT-INDENT: -37.55pt"><span lang="EN-GB"><span class="msoIns"><ins cite="mailto:Simon%20Robinson" datetime="2001-06-10T23:28">●<span style="FONT: 7pt 'Times New Roman'">&nbsp;&nbsp; </span></ins></span></span><span lang="EN-US">decimal</span><span style="FONT-FAMILY: 宋体">转换为任何数字类型<span style="LETTER-SPACING: -0.5pt">&mdash;&mdash;</span></span><span style="LETTER-SPACING: -0.5pt"> </span><span style="FONT-FAMILY: 宋体">因为</span><span lang="EN-GB">decimal </span><span style="FONT-FAMILY: 宋体">类型的内部结构不同于整数和浮点数</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">但是，可以使用</span><span lang="EN-GB">cast</span><span style="FONT-FAMILY: 宋体">显示执行这些转换。在把一种类型转换为另一种类型时，要迫使编译器进行转换。类型转换的一般语法如下：</span></p>
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