本文探讨了两种提高编程质量的方法：一是通过在首次使用时声明局部变量来缩小其作用范围；二是根据循环变量在循环后的用途选择合适的循环结构，推荐在不再需要循环变量时使用for循环而非while循环。
<p class="MsoNormal" style=""><span style="" lang="EN-US"><span style=""><span style="font-family: Times New Roman;"><span style="font-size: small;">1.</span><span style='font: 7pt "Times New Roman";'> </span></span></span></span><span style=""><span style="font-size: small;">将局部变量的作用最小化最有力的技术是在第一次使用它的地方声明。</span></span></p>
<p class="MsoNormal" style=""><span style="" lang="EN-US"><span style=""><span style="font-family: Times New Roman;"><span style="font-size: small;">2.</span><span style='font: 7pt "Times New Roman";'> </span></span></span></span><span style="font-size: small;"><span style="">如果循环终止后，循环变量不再被需要，则</span><span lang="EN-US"><span style="font-family: Times New Roman;">for</span></span><span style="">循环优先于</span><span lang="EN-US"><span style="font-family: Times New Roman;">while</span></span><span style="">循环。</span></span></p>
<p class="MsoNormal" style=""><span style="" lang="EN-US"><span style=""><span style="font-family: Times New Roman;"><span style="font-size: small;">2.</span><span style='font: 7pt "Times New Roman";'> </span></span></span></span><span style="font-size: small;"><span style="">如果循环终止后，循环变量不再被需要，则</span><span lang="EN-US"><span style="font-family: Times New Roman;">for</span></span><span style="">循环优先于</span><span lang="EN-US"><span style="font-family: Times New Roman;">while</span></span><span style="">循环。</span></span></p>
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