⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 sec1-4.htm

📁 Fortran77和90/95编程入门,用于教学
💻 HTM
📖 第 1 页 / 共 5 页
字号:
🔍
12345 
0pt'>)<span
style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span style='color:#993366'>(F90)</span><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='text-indent:97.45pt;mso-char-indent-count:
8.12;line-height:17.0pt;mso-line-height-rule:exactly;mso-char-indent-size:12pt'><span
lang=EN-US style='mso-font-kerning:0pt'>2.7182818_p<span
style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span>(p</span><span lang=ZH-CN style='mso-font-kerning:0pt'>为定义精度的参量</span><span
lang=EN-US style='mso-font-kerning:0pt'>) <span
style='mso-spacerun:yes'>&nbsp;</span><span style='color:#993366'>(F90)</span><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:60.0pt;text-indent:-26.1pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-list:l0 level2 lfo4;tab-stops:49.5pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><![if !supportLists]><span
lang=EN-US style='font-family:Symbol;mso-fareast-font-family:Symbol;mso-bidi-font-family:
Symbol;mso-font-kerning:0pt'><span style='mso-list:Ignore'><img width=13
height=13 src="Sec1-4.files/image001.gif" alt="*"><span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=ZH-CN style='color:fuchsia'>指数形式</span><span
lang=ZH-CN>：用指数形式表示的实数由两部分组成，即数字部分和指数部分。</span><span lang=EN-US
style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='text-indent:97.45pt;mso-char-indent-count:
8.12;line-height:17.0pt;mso-line-height-rule:exactly;mso-char-indent-size:12pt'><span
lang=EN-US style='mso-font-kerning:0pt'>7.8E-12<span
style='mso-spacerun:yes'>&nbsp;&nbsp;&nbsp; </span>-0.125E5<o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='text-indent:97.45pt;mso-char-indent-count:
8.12;line-height:17.0pt;mso-line-height-rule:exactly;mso-char-indent-size:12pt'><span
lang=EN-US style='mso-font-kerning:0pt'>0.125D+45(</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>双精度，</span><span lang=EN-US style='mso-font-kerning:
0pt'>8</span><span lang=ZH-CN style='mso-font-kerning:0pt'>字节</span><span
lang=EN-US style='mso-font-kerning:0pt'>)<o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='text-indent:24.0pt;mso-char-indent-count:
2.0;line-height:17.0pt;mso-line-height-rule:exactly;mso-char-indent-size:12pt'><span
lang=ZH-CN>在计算机内存中存储一个实数</span><span lang=EN-US>(</span><span lang=ZH-CN>不论是用小数形式表示或以指数形式表示</span><span
lang=EN-US>)</span><span lang=ZH-CN>时情况与整数不同。实数在内存中一律以指数形式存放，它由三个部分组成：</span><span
lang=EN-US>(1)</span><span class=GramE><span lang=ZH-CN>数符</span></span><span
lang=ZH-CN>；</span><span lang=EN-US>(2)</span><span lang=ZH-CN>指数包括符号；</span><span
lang=EN-US>(3)</span><span lang=ZH-CN>数字部分。数字部分最前面有一个隐含的小数点。用</span><span
lang=EN-US>4</span><span lang=ZH-CN>个字节</span><span lang=EN-US>(32bit)</span><span
lang=ZH-CN>来存储时，</span><span lang=EN-US>1</span><span lang=ZH-CN>位存储数的符号，</span><span
lang=EN-US>7</span><span lang=ZH-CN>位存储指数部分，</span><span lang=EN-US>24</span><span
lang=ZH-CN>位存储数字部分。由于存储指数部分和数字部分的值</span><span lang=EN-US>(bit)</span><span
lang=ZH-CN>长是有限的，因此一个实数的有效数字和数的范围都是有限的。</span><span lang=EN-US
style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='text-indent:24.0pt;mso-char-indent-count:
2.0;line-height:17.0pt;mso-line-height-rule:exactly;mso-char-indent-size:12pt'><span
lang=ZH-CN>如果以</span><span lang=EN-US>24</span><span lang=ZH-CN>位来存储<span
class=GramE>一</span>个数，它最大可以存储<span class=GramE>十进数为</span></span><span
lang=EN-US>2<sup>24</sup></span><span lang=ZH-CN>－</span><span lang=EN-US>l</span><span
lang=ZH-CN>（减</span><span lang=EN-US>1</span><span lang=ZH-CN>是因为规定小数点后第一个数字不能为零，以便充分利用有限的</span><span
lang=EN-US>bit</span><span lang=ZH-CN>位来存储有效数字），即</span><span lang=EN-US>16777215</span><span
lang=ZH-CN>。也就是说可以存放</span><span lang=EN-US>0</span><span lang=ZH-CN>—</span><span
lang=EN-US>16777215</span><span lang=ZH-CN>这个范围内的数，超过这个范围的数是不能存储的。可见，只能有</span><span
lang=EN-US>7</span><span lang=ZH-CN>位有效数字</span><span lang=EN-US>(16777215</span><span
lang=ZH-CN>虽然是八位数，但并不是所有</span><span lang=EN-US>8</span><span class=GramE><span
lang=ZH-CN>值数都能</span></span><span lang=ZH-CN>有效存储</span><span lang=EN-US>)</span><span
lang=ZH-CN>。如果某计算机系统用</span><span lang=EN-US>n</span><span class=GramE><span
lang=ZH-CN>个</span></span><span lang=ZH-CN>二进位来存储一个实数的数字部分，则该实数的十进制数的有效数字位数大体上略小于</span><span
lang=EN-US>n/3</span><span lang=ZH-CN>。</span><span lang=EN-US
style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='text-indent:24.0pt;mso-char-indent-count:
2.0;line-height:17.0pt;mso-line-height-rule:exactly;mso-char-indent-size:12pt'><span
lang=ZH-CN>一个实数的范围也是有限的，这主要是由于存储实数的指数部分的位长是有限的。如果<span class=GramE>一</span>个数的绝对值超过此范围，就会出现“溢出”，绝对值比上界大的称为“上溢”，系统对此按数据出错处理。比下界小的称为“下溢”，大多数计算机系统将该数据<span
class=GramE>按零处理</span>。</span><span lang=EN-US style='mso-fareast-language:
JA'>[<a href="example/e_141_01.f">e_<span style='mso-fareast-language:ZH-CN'>14</span>1_<span
style='mso-fareast-language:ZH-CN'>01</span>.f</a>]</span><span lang=EN-US> </span><span
lang=EN-US style='mso-fareast-language:JA'>[<a href="example/e_141_02.f90">e_1<span
style='mso-fareast-language:ZH-CN'>41</span>_<span style='mso-fareast-language:
ZH-CN'>02</span>.f<span style='mso-fareast-language:ZH-CN'>90</span></a>]</span><span
lang=EN-US style='mso-font-kerning:0pt;mso-fareast-language:JA'><o:p></o:p></span></p>

<pre><span lang=EN-US style='font-size:12.0pt;mso-bidi-font-size:10.0pt;
font-family:宋体;mso-fareast-language:JA'><o:p>&nbsp;</o:p></span></pre>

<p class=MsoBodyTextIndent3 style='margin-left:36.75pt;text-indent:-36.75pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=ZH-CN style='color:fuchsia'>复</span><span
lang=EN-US style='color:fuchsia'><span style='mso-spacerun:yes'>&nbsp; </span></span><span
lang=ZH-CN style='color:fuchsia'>型</span><span lang=ZH-CN style='mso-font-kerning:
0pt'>：默认值为</span><span lang=EN-US style='mso-font-kerning:0pt'>2</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>×</span><span lang=EN-US
style='mso-font-kerning:0pt'>4</span><span lang=ZH-CN style='mso-font-kerning:
0pt'>字节（其它为</span><span lang=EN-US style='mso-font-kerning:0pt'>8</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>字节）。实部与虚部用括号围起来表示：</span><span
lang=EN-US style='mso-font-kerning:0pt'>(</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>实数，实数</span><span lang=EN-US style='mso-font-kerning:
0pt'>)</span><span lang=ZH-CN style='mso-font-kerning:0pt'>。</span><span
lang=EN-US style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:36.75pt;text-indent:-36.75pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=ZH-CN style='color:fuchsia'>逻辑型</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>：默认值为</span><span lang=EN-US
style='mso-font-kerning:0pt'>4</span><span lang=ZH-CN style='mso-font-kerning:
0pt'>字节（其它为</span><span lang=EN-US style='mso-font-kerning:0pt'>1</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>字节）。其<span class=GramE>值只能</span>为：</span><span
lang=EN-US style='mso-font-kerning:0pt'>.TRUE.</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>（真） 和</span><span lang=EN-US style='mso-font-kerning:
0pt'> .FALSE.</span><span lang=ZH-CN style='mso-font-kerning:0pt'>（假）。</span><span
lang=EN-US style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:36.75pt;text-indent:-36.75pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=ZH-CN style='color:fuchsia'>字符型</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>：</span><span lang=EN-US
style='mso-font-kerning:0pt'>1</span><span lang=ZH-CN style='mso-font-kerning:
0pt'>个字符为</span><span lang=EN-US style='mso-font-kerning:0pt'>1</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>字节（中文系统中为</span><span lang=EN-US
style='mso-font-kerning:0pt'>2</span><span lang=ZH-CN style='mso-font-kerning:
0pt'>字节）。用</span><span lang=EN-US style='mso-font-kerning:0pt'> '<span
style='mso-spacerun:yes'>&nbsp; </span><span class=SpellE>'</span><span
style='color:#993366'>(F90</span></span><span lang=ZH-CN style='color:#993366;
mso-font-kerning:0pt'>：</span><span lang=EN-US style='color:#993366;mso-font-kerning:
0pt'>&quot;<span style='mso-spacerun:yes'>&nbsp; </span>&quot;)</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>围起来的字符串。</span><span lang=EN-US
style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:36.75pt;text-indent:9.75pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=ZH-CN style='mso-font-kerning:0pt'>例：</span><span
lang=EN-US style='mso-font-kerning:0pt'>&quot;I'm a boy.&quot;<span
style='mso-spacerun:yes'>&nbsp; </span></span><span lang=ZH-CN
style='mso-font-kerning:0pt'>（長为</span><span lang=EN-US style='mso-font-kerning:
0pt'>10</span><span lang=ZH-CN style='mso-font-kerning:0pt'>字节）</span><span
lang=EN-US style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:36.75pt;text-indent:33.15pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=EN-US style='mso-font-kerning:0pt'>'<span
class=SpellE>I''m</span> a boy.' </span><span lang=ZH-CN style='mso-font-kerning:
0pt'>（長为</span><span lang=EN-US style='mso-font-kerning:0pt'>10</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>字节）</span><span lang=EN-US
style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:36.75pt;text-indent:-36.75pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=ZH-CN style='color:fuchsia'>数</span><span
lang=EN-US style='color:fuchsia'><span style='mso-spacerun:yes'>&nbsp; </span></span><span
lang=ZH-CN style='color:fuchsia'>组</span><span lang=ZH-CN style='mso-font-kerning:
0pt'>：这不是一种单独的类型，可把同类型的常量用一维维数<span class=GramE>括</span>起来表示：</span><span
lang=EN-US style='mso-font-kerning:0pt'>(/</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>常量，常量，</span><span lang=EN-US style='mso-font-kerning:
0pt'>...</span><span lang=ZH-CN style='mso-font-kerning:0pt'>，常量</span><span
lang=EN-US style='mso-font-kerning:0pt'>/)</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>。 </span><span lang=EN-US style='color:#993366;
mso-font-kerning:0pt'>(F90)</span><span lang=EN-US style='mso-font-kerning:
0pt'><o:p></o:p></span></p>

<p style='margin-left:18.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo2;
tab-stops:list 18.0pt'><a name="第1_4_1b"></a><![if !supportLists]><span
lang=EN-US style='font-family:宋体;mso-bidi-font-family:宋体;color:red'><span
style='mso-list:Ignore'>b)<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=ZH-CN style='font-family:宋体;
color:red'>变量</span><span lang=EN-US style='font-family:宋体;color:red'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='text-indent:24.0pt;mso-char-indent-count:
2.0;line-height:17.0pt;mso-line-height-rule:exactly;mso-char-indent-size:12pt'><span
lang=ZH-CN>变量是指在程序运行期间其值是可以变化的量。系统为程序中的每一个变量开辟一个存储单元，用来存放变量的值。</span><span
lang=EN-US style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='text-indent:24.0pt;mso-char-indent-count:
2.0;line-height:17.0pt;mso-line-height-rule:exactly;mso-char-indent-size:12pt'><span
lang=ZH-CN style='mso-font-kerning:0pt'>常量是分为类型的，而变量是用来存放常量的，因此变量也相应地区分为整型变量</span><span
lang=EN-US>INTEGER</span><span lang=ZH-CN style='mso-font-kerning:0pt'>、<span
class=GramE>实型变量</span></span><span lang=EN-US>REAL</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>、双精度变量</span><span lang=EN-US style='mso-font-kerning:
0pt'>DOUBLE PRECISION</span><span lang=ZH-CN style='mso-font-kerning:0pt'>、<span
class=GramE>复型变量</span></span><span lang=EN-US style='mso-font-kerning:0pt'>COMPLEX</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>、逻辑型变量</span><span lang=EN-US
style='mso-font-kerning:0pt'>LOGICAL</span><span lang=ZH-CN style='mso-font-kerning:
0pt'>、字符型变量</span><span lang=EN-US style='mso-font-kerning:0pt'>CHARACTER</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>。在程序中应当说明哪些变量是整型变量，哪些变量<span
class=GramE>是实型变量</span>。变量在内存中所占的字节数和数据存储形式与相应类型的常数相同。例如，<span class=GramE>实型变量</span>一般占</span><span
lang=EN-US style='mso-font-kerning:0pt'>4</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>个字节，按指数形式存放。在程序中规定变量的类型可以用以下几种方法。</span><span
lang=EN-US style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:59.4pt;text-indent:-59.4pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=ZH-CN style='color:fuchsia'>隐含约定</span><span
lang=ZH-CN>：</span><span lang=EN-US>Fortran</span><span lang=ZH-CN>规定，凡以字母</span><span
lang=EN-US>I</span><span lang=ZH-CN>，</span><span lang=EN-US>J</span><span
lang=ZH-CN>，</span><span lang=EN-US>K</span><span lang=ZH-CN>，</span><span
lang=EN-US>L</span><span lang=ZH-CN>，</span><span lang=EN-US>M</span><span
lang=ZH-CN>，</span><span lang=EN-US>N</span><span lang=ZH-CN>六个字母开头的变量名，如<span
class=GramE>无另外</span>说明则为整型变量。以其它字母开头的变量为实型变量。可以将这个隐含约定称为“</span><span
lang=EN-US style='color:#660066'>I</span><span lang=ZH-CN style='color:#660066'>—</span><span
lang=EN-US style='color:#660066'>N</span><span lang=ZH-CN style='color:#660066'>规则</span><span
lang=ZH-CN>” ，表示用</span><span lang=EN-US>I</span><span lang=ZH-CN>到</span><span
lang=EN-US>N</span><span lang=ZH-CN>之间的字母开头的变量为整型。例如：</span><span lang=EN-US>I</span><span
lang=ZH-CN>，</span><span lang=EN-US>J</span><span lang=ZH-CN>，</span><span
lang=EN-US>IMAX</span><span lang=ZH-CN>，</span><span lang=EN-US>NUMBER</span><span
lang=ZH-CN>，</span><span lang=EN-US>LINE</span><span lang=ZH-CN>，</span><span
lang=EN-US>JOB</span><span lang=ZH-CN>，</span><span class=SpellE><span
lang=EN-US>Kl</span></span><span lang=ZH-CN>为整型变量，而</span><span lang=EN-US>A</span><span
lang=ZH-CN>，</span><span class=SpellE><span lang=EN-US>Bl</span></span><span
lang=ZH-CN>，</span><span lang=EN-US>COUNT</span><span lang=ZH-CN>，</span><span
lang=EN-US>AMOUNT</span><span lang=ZH-CN>，</span><span lang=EN-US>TOTAL</span><span
lang=ZH-CN>，</span><span lang=EN-US>BOOK</span><span lang=ZH-CN>为实型变量。</span><span
lang=EN-US style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:59.4pt;text-indent:-59.4pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=ZH-CN style='color:fuchsia'>类型指定</span><span
lang=ZH-CN>：如果想改变“</span><span lang=EN-US>I</span><span lang=ZH-CN>—</span><span
lang=EN-US>N</span><span lang=ZH-CN>规则”对变量类型的约束，可以用类型说明语句专门指定某些变量的类型。</span><span
lang=EN-US>Fortran</span><span lang=ZH-CN>中有六个类型说明语句：</span><span lang=EN-US
style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:59.4pt;text-indent:-.9pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=EN-US>(1)INTEGER</span><span lang=ZH-CN>语句</span><span
lang=EN-US>(</span><span lang=ZH-CN>整型说明语句</span><span lang=EN-US>)</span><span
lang=EN-US style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:59.4pt;text-indent:-.9pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=EN-US style='mso-font-kerning:0pt'>(2)REAL</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>语句</span><span lang=EN-US
style='mso-font-kerning:0pt'>(</span><span class=GramE><span lang=ZH-CN
style='mso-font-kerning:0pt'>实型说明</span></span><span lang=ZH-CN
style='mso-font-kerning:0pt'>语句</span><span lang=EN-US style='mso-font-kerning:
0pt'>)<o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:59.4pt;text-indent:-.9pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=EN-US style='mso-font-kerning:0pt'>(3)DOUBLE
PRECISION</span><span lang=ZH-CN style='mso-font-kerning:0pt'>语句</span><span
lang=EN-US style='mso-font-kerning:0pt'>(</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>双精度说明语句</span><span lang=EN-US style='mso-font-kerning:
0pt'>)<o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:59.4pt;text-indent:-.9pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=EN-US style='mso-font-kerning:0pt'>(4)COMPLEX</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>语句</span><span lang=EN-US
style='mso-font-kerning:0pt'>(</span><span class=GramE><span lang=ZH-CN
style='mso-font-kerning:0pt'>复型说明</span></span><span lang=ZH-CN
style='mso-font-kerning:0pt'>语句</span><span lang=EN-US style='mso-font-kerning:
0pt'>)<o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:59.4pt;text-indent:-.9pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-char-indent-size:0cm'><span lang=EN-US style='mso-font-kerning:0pt'>(5)LOGICAL</span><span
lang=ZH-CN style='mso-font-kerning:0pt'>语句</span><span lang=EN-US
style='mso-font-kerning:0pt'>(</span><span lang=ZH-CN style='mso-font-kerning:
0pt'>逻辑<span class=GramE>型说明</span>语句</span><span lang=EN-US style='mso-font-kerning:
0pt'>)<o:p></o:p></span></p>

<p class=MsoBodyTextIndent3 style='margin-left:59.4pt;text-indent:-.9pt;
12345

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -