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<h2 align="center"><font face="楷体_GB2312">1.2 <a name="_top"></a>基本数据类型和常量</font></h2>
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<td width="50%" align="center"><a href="c12.htm#c121.html#c121">基本概念</a></td>
<td width="50%" align="center"><a href="c12.htm#c122.html#c122">练习题</a></td>
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<h3><a name="c121"></a>1. 基本概念</h3>
<blockquote>
<p>不同的数据类型必须有不同的表示格式。</p>
<p>C的四种基本数据类型是： </p>
<div align="center"><center><table border="4" width="470" bgcolor="#CCFFFF"
bordercolor="#FF9933" cellspacing="0" cellpadding="0">
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<td width="109" align="center" bgcolor="#FF9933">类型</td>
<td width="87" align="center" bgcolor="#FF9933">长度(位)</td>
<td width="268" align="center" bgcolor="#FF9933">举例</td>
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<tr>
<td width="109" align="center">char </td>
<td width="87" align="center">8</td>
<td width="268" align="center">A 7 c * ^ ...</td>
</tr>
<tr>
<td width="109" align="center">int </td>
<td width="87" align="center">16</td>
<td width="268" align="center">125 -77 32500 0x1A 077 ...</td>
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<td width="109" align="center">float</td>
<td width="87" align="center">32</td>
<td width="268" align="center">1.25 -0.89 .4e-4 7.69e20 ...</td>
</tr>
<tr>
<td width="109" align="center">double</td>
<td width="87" align="center">64</td>
<td width="268" align="center">1.25 -0.89 .4e-4 7.69e20 ...</td>
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</center></div><p>下面我们看一下变量的说明方法:<ul>
<li>整数变量: int int_var; long int l_int_var;</li>
<li>符型变量: char ch_var;</li>
<li>其它的例子: float f_var; double d_var;
short int s_int_var; <br>
unsigned int u_int_var;</li>
</ul>
<p>假定某个表达式仅包含 int, char, float , double 常量, 那么,
这种表达式被称作为常量表达式。</p>
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<h3><a name="c122"></a>2.练习题</h3>
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