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<title>第四章：按钮</title>
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<td width="100%"><font size="3" color="#8000FF"><strong><em>第四章：按钮（3）</em></strong></font></td>
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<td width="100%" style="background-color: rgb(232,255,254)"><p ALIGN="JUSTIFY"><strong>下面的例子要更加复杂些，大家一定都用过Windows附件中的计算器，它是一个标准的科学计算器，利用VB我们也可以做到，只是没有那么复杂，四则运算而已。</strong></p>
<p ALIGN="JUSTIFY"><strong>先建立一个新的项目文件，里面包含一个Form1的窗体。然后，添加控件，包括一个Text框（Text1），和17个按钮，这17个按钮使用的名称都是Command1，只是Index属性不同，就好象一个数组，创立一组按钮的方法是，先在窗体上建立一个按钮（Command1），然后在Command1上击鼠标右键，选择复制（Copy），然后在窗体上任意部位击右键，选择粘贴（Paste），系统会提示是否创建控件组，选择“是”，重复上面步骤，直至创立17个按钮为止。各控件属性如下表：</strong></p>
<p ALIGN="JUSTIFY"><img src="0406.gif" alt="04－06.gif (3581 字节)" WIDTH="224" HEIGHT="291"></p>
<table BORDER="1" CELLSPACING="1" CELLPADDING="7" WIDTH="331">
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<td WIDTH="24%" VALIGN="TOP"><p ALIGN="JUSTIFY"><strong>Text1</strong></td>
<td WIDTH="76%" VALIGN="TOP"><p ALIGN="JUSTIFY"><strong>BackColor＝&H00C0FFFF&</strong></p>
<p ALIGN="JUSTIFY"><strong>Text＝“0.”</strong></td>
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<td WIDTH="24%" VALIGN="TOP"><p ALIGN="JUSTIFY"><strong>Command1</strong></td>
<td WIDTH="76%" VALIGN="TOP"><p ALIGN="JUSTIFY"><strong>Index 0――16</strong></p>
<p ALIGN="JUSTIFY"><strong>Index 0――9 Caption=“0”－“9”</strong></p>
<p ALIGN="JUSTIFY"><strong>Index 10 Caption=“.”</strong></p>
<p ALIGN="JUSTIFY"><strong>Index 11 Caption=“=”</strong></p>
<p ALIGN="JUSTIFY"><strong>Index 12 Caption=“+”</strong></p>
<p ALIGN="JUSTIFY"><strong>Index 13 Caption=“-”</strong></p>
<p ALIGN="JUSTIFY"><strong>Index 14 Caption=“×”</strong></p>
<p ALIGN="JUSTIFY"><strong>Index 15 Caption=“÷”</strong></p>
<p ALIGN="JUSTIFY"><strong>Index 16 Caption=“清除”</strong></td>
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<p ALIGN="JUSTIFY"><strong>如果想改变一些其他的属性，比如字体，可以自己定义一下Font属性，如果相对多个控件的共同属性进行改变，可以在窗体上按下鼠标，拖动，把多个控件一起选定，然后对它们的共同属性进行修改。</strong></p>
<p ALIGN="JUSTIFY"><strong>别看这个东西小，还费了近我两个小时呢，不觉大叹手生，里面也有些地方很绕弯子，我尽量解释清楚。</strong></p>
<p ALIGN="JUSTIFY"><strong>在编写程序之前，我们先来回顾一下计算器的使用。</strong></p>
<ol>
<li><strong>按下数字键在液晶屏上会出现数字，这是最基本的功能。</strong></li>
<li><strong>第一次按下运算键，再按下数字键，将重新输入第二个数字，再次按下运算键，将算出前两个数的结果，然后按下数字键，将又重新输入新的数字。</strong></li>
<li><strong>输入数字后，按下“等于键”将仍输出原来的数字，输入运算符和第二个数字后在按下“等于”，将得到二者的结果。然后又重复第二、三步。</strong></li>
<li><strong>按下“清除”，数据被全部清除。</strong></li>
</ol>
<p ALIGN="JUSTIFY"><strong>了解了这些，我们一步一步实现。</strong></td>
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