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<h2 align="center"><a name="_top"></a><font face="楷体_GB2312">4.1 函数定义</font></h2>
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<td width="50%" align="center"><a href="c41.htm#c411.html#c411">引言</a></td>
<td width="50%" align="center"><a href="c41.htm#c412.html#c412">函数的一般形式</a></td>
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<h3><a name="c411"></a>1.引言</h3>
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<font SIZE="2"><p></font>一个函数是根据进去的信息(输入)和产生的东西(输出结果)所定义的一个黑盒。</p>
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<font SIZE="2"><p></font>在 C 语言函数中: </p>
<p><img src="../img/dot.gif" alt="dot.gif (114 bytes)" WIDTH="7" HEIGHT="7">
我们用参数把值传送进函数: <br>
<img src="../img/dot.gif" alt="dot.gif (114 bytes)" WIDTH="7" HEIGHT="7"> 我们用 RETURN
把一个值返回调用函数。</p>
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<h3><a name="c412"></a>2.函数的一般形式<font SIZE="2"></h3>
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<p>我们必须在使用函数前先定义它。一个典型的函数定义具有下列格式:
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<p>老的定义格式为:</p>
<pre><font color="#000080">类型 名称(参数表)
参数说明
{
...........
return(exp);
}</font></pre>
<p>你已经了解了函数定义的形式, 你想看一个例子吗?</p>
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<p>老的定义格式为:</p>
<p><font color="#000080">int increment (i)<br>
int i;<br>
{<br>
i=i+5;<br>
return(i);<br>
}</font></p>
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