sec3-2.htm

Fortran77和90/95编程入门,用于教学

style='mso-font-kerning:0pt'>的正整数，判断它是不是一个素数。</span><span lang=EN-US
style='mso-font-kerning:0pt'><a href="example/e_322_01.f90">[e_322_01.f90]</a><a
href="example/e_322_02.f90">[e_322_02.f90]</a><o:p></o:p></span></p>

<p class=MsoBodyTextIndent2 style='line-height:17.0pt;mso-line-height-rule:
exactly'><span lang=ZH-CN style='mso-font-kerning:0pt'>例：求两个整数的最大公约数。</span><span
lang=EN-US style='mso-font-kerning:0pt'><a href="example/e_322_03.f90">[e_322_03.f90]</a><a
href="example/e_322_04.f90">[e_322_04.f90]</a><o:p></o:p></span></p>

<p class=MsoBodyTextIndent2 style='line-height:17.0pt;mso-line-height-rule:
exactly'><span lang=ZH-CN style='mso-font-kerning:0pt'>例：求正弦函数的近似值。</span><span
lang=EN-US style='mso-font-kerning:0pt'><a href="example/e_322_05.f90">[e_322_05.f90]</a><o:p></o:p></span></p>

<p class=MsoNormal align=center style='margin-top:15.6pt;margin-right:0cm;
margin-bottom:15.6pt;margin-left:0cm;mso-para-margin-top:1.0gd;mso-para-margin-right:
0cm;mso-para-margin-bottom:1.0gd;mso-para-margin-left:0cm;text-align:center'><a
name="第3_2_3"><span lang=EN-US style='font-size:16.0pt;mso-bidi-font-size:12.0pt;
mso-fareast-font-family:楷体_GB2312'>3.2.3</span></a><span lang=EN-US
style='font-size:16.0pt;mso-bidi-font-size:12.0pt;mso-fareast-font-family:楷体_GB2312;
color:red'> DO </span><span lang=ZH-CN style='font-size:16.0pt;mso-bidi-font-size:
12.0pt;font-family:楷体_GB2312;mso-ascii-font-family:"Times New Roman";
color:red'>构造的一般形式</span><span lang=EN-US style='font-size:16.0pt;mso-bidi-font-size:
12.0pt;mso-fareast-font-family:楷体_GB2312;color:red'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent2 style='line-height:17.0pt;mso-line-height-rule:
exactly'><span lang=ZH-CN style='mso-font-kerning:0pt'>由以上的各种</span><span
lang=EN-US style='mso-font-kerning:0pt'>DO</span><span lang=ZH-CN
style='mso-font-kerning:0pt'>循环可归纳为其下的</span><span lang=EN-US style='mso-font-kerning:
0pt'>DO</span><span lang=ZH-CN style='mso-font-kerning:0pt'>构造一般形式：</span><span
lang=EN-US style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:22.8pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>[</span><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>构造名</span><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>:] DO [</span><span lang=ZH-CN style='font-size:
12.0pt;font-family:宋体;color:#FF6600'>标号</span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#FF6600'>][</span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#FF6600'>循环控制</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#FF6600'>]<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:45.6pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>块</span><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:22.8pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>终止语句</span><span lang=EN-US style='font-size:
12.0pt;font-family:宋体;color:#FF6600'><o:p></o:p></span></p>

<p class=MsoBodyTextIndent2 style='margin-left:42.0pt;text-indent:-18.0pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-list:l1 level1 lfo4;tab-stops:list 42.0pt left 45.8pt 91.6pt 137.4pt 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;
mso-char-indent-size:12pt'><![if !supportLists]><span lang=EN-US
style='mso-bidi-font-family:宋体;mso-font-kerning:0pt'><span style='mso-list:
Ignore'>1)<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span
lang=ZH-CN style='mso-font-kerning:0pt'>循环控制的形式是：</span><span lang=EN-US
style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:22.8pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>[,] </span><span lang=ZH-CN style='font-size:
12.0pt;font-family:宋体;color:#FF6600'>循环变量＝下界，上界</span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#FF6600'>[</span><span lang=ZH-CN
style='font-size:12.0pt;font-family:宋体;color:#FF6600'>，增量</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#FF6600'>] </span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#FF6600'>或</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#FF6600'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:22.8pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>[,] WHILE(</span><span lang=ZH-CN
style='font-size:12.0pt;font-family:宋体;color:#FF6600'>逻辑表达式</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#FF6600'>) </span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#FF6600'>或</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#FF6600'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:22.8pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>无</span><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:fuchsia'> </span><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;mso-font-kerning:0pt'>(</span><span lang=ZH-CN style='font-size:
12.0pt;font-family:宋体;mso-font-kerning:0pt'>用块中的</span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>EXIT</span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>和</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>CYCLE</span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>语句进行实际的控制</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>)<o:p></o:p></span></p>

<p class=MsoBodyTextIndent2 style='margin-left:42.0pt;text-indent:-18.0pt;
mso-char-indent-count:0;line-height:17.0pt;mso-line-height-rule:exactly;
mso-list:l1 level1 lfo4;tab-stops:list 42.0pt left 45.8pt 91.6pt 137.4pt 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;
mso-char-indent-size:0cm'><![if !supportLists]><span lang=EN-US
style='mso-bidi-font-family:宋体;mso-font-kerning:0pt'><span style='mso-list:
Ignore'>2)<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp; </span></span></span><![endif]><span
lang=ZH-CN style='mso-font-kerning:0pt'>终止语句的形式是：</span><span lang=EN-US
style='mso-font-kerning:0pt'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:22.8pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>END DO[</span><span lang=ZH-CN style='font-size:
12.0pt;font-family:宋体;color:#FF6600'>构造名</span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#FF6600'>]</span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:fuchsia'> </span><span lang=ZH-CN
style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>或</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:fuchsia'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:22.8pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>[</span><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>标号</span><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>] CONTINUE</span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:fuchsia'> </span><span lang=ZH-CN
style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>或</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:fuchsia'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:22.8pt;text-indent:24.0pt;mso-char-indent-count:
2.0;mso-char-indent-size:12pt'><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>[</span><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>标号</span><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>] </span><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#FF6600'>允许的执行语句</span><span lang=EN-US style='font-size:
12.0pt;font-family:宋体;color:#FF6600'><o:p></o:p></span></p>

<p class=MsoNormal align=center style='margin-top:15.6pt;margin-right:0cm;
margin-bottom:15.6pt;margin-left:0cm;mso-para-margin-top:1.0gd;mso-para-margin-right:
0cm;mso-para-margin-bottom:1.0gd;mso-para-margin-left:0cm;text-align:center;
line-height:200%;tab-stops:45.8pt 91.6pt 137.4pt 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'><span
lang=ZH-CN style='font-size:16.0pt;line-height:200%;font-family:宋体;color:#3333FF'>【作业】</span><span
lang=EN-US style='font-size:16.0pt;line-height:200%;font-family:宋体;color:#3333FF'><o:p></o:p></span></p>

<p class=MsoNormal style='line-height:17.0pt;mso-line-height-rule:exactly'><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'>[3.1] </span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#333399'>用不带循环控制变量的</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'>DO</span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#333399'>构造求下列式（当</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'>m</span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#333399'>≥</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'>1000</span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#333399'>时停止）：</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'><o:p></o:p></span></p>

<p class=MsoNormal style='text-indent:35.4pt;mso-char-indent-count:2.95;
line-height:17.0pt;mso-line-height-rule:exactly'><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#333399'>(1)<span
style='position:relative;top:3.0pt;mso-text-raise:-3.0pt'><!--[if gte vml 1]><v:shape
 id="_x0000_i1026" type="#_x0000_t75" style='width:96.75pt;height:15.75pt'
 o:ole="">
 <v:imagedata src="Sec3-2.files/image003.wmz" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=129 height=21
src="Sec3-2.files/image002.gif" v:shapes="_x0000_i1026"><![endif]></span><!--[if gte mso 9]><xml>
 <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1026"
  DrawAspect="Content" ObjectID="_1069416770">
 </o:OLEObject>
</xml><![endif]--><o:p></o:p></span></p>

<p class=MsoNormal style='text-indent:35.4pt;mso-char-indent-count:2.95;
line-height:17.0pt;mso-line-height-rule:exactly'><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#333399'>(2)<span
style='position:relative;top:5.0pt;mso-text-raise:-5.0pt'><!--[if gte vml 1]><v:shape
 id="_x0000_i1027" type="#_x0000_t75" style='width:125.25pt;height:18pt' o:ole="">
 <v:imagedata src="Sec3-2.files/image005.wmz" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=167 height=24
src="Sec3-2.files/image004.gif" v:shapes="_x0000_i1027"><![endif]></span><!--[if gte mso 9]><xml>
 <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1027"
  DrawAspect="Content" ObjectID="_1069416771">
 </o:OLEObject>
</xml><![endif]--><o:p></o:p></span></p>

<p class=MsoNormal style='text-indent:35.4pt;mso-char-indent-count:2.95'><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'>(3)<span
style='position:relative;top:14.0pt;mso-text-raise:-14.0pt'><!--[if gte vml 1]><v:shape
 id="_x0000_i1028" type="#_x0000_t75" style='width:87.75pt;height:33.75pt'
 o:ole="">
 <v:imagedata src="Sec3-2.files/image007.wmz" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=117 height=45
src="Sec3-2.files/image006.gif" v:shapes="_x0000_i1028"><![endif]></span><!--[if gte mso 9]><xml>
 <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1028"
  DrawAspect="Content" ObjectID="_1069416772">
 </o:OLEObject>
</xml><![endif]--><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:35.4pt;text-indent:-35.4pt;mso-char-indent-count:
-2.95;line-height:17.0pt;mso-line-height-rule:exactly'><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#333399'>[3.2] </span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#333399'>设</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'><span
style='position:relative;top:5.0pt;mso-text-raise:-5.0pt'><!--[if gte vml 1]><v:shape
 id="_x0000_i1029" type="#_x0000_t75" style='width:123pt;height:18pt' o:ole="">
 <v:imagedata src="Sec3-2.files/image009.wmz" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=164 height=24
src="Sec3-2.files/image008.gif" v:shapes="_x0000_i1029"><![endif]></span><!--[if gte mso 9]><xml>
 <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1029"
  DrawAspect="Content" ObjectID="_1069416773">
 </o:OLEObject>
</xml><![endif]--></span><span lang=ZH-CN style='font-size:12.0pt;font-family:
宋体;color:#333399'>，编程求</span><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#333399'>f(x)</span><span lang=ZH-CN style='font-size:
12.0pt;font-family:宋体;color:#333399'>的前若干项之和，当相邻两项差的绝对值小于</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'>10</span><sup><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#333399'>－</span></sup><sup><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'>6</span></sup><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#333399'>即可。</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:35.4pt;text-indent:-35.4pt;mso-char-indent-count:
-2.95;line-height:17.0pt;mso-line-height-rule:exactly'><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#333399'>[3.3] </span><span
lang=ZH-CN style='font-size:12.0pt;font-family:宋体;color:#333399'>用牛顿迭代法求方程</span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;color:#333399'><span
style='position:relative;top:3.0pt;mso-text-raise:-3.0pt'><!--[if gte vml 1]><v:shape
 id="_x0000_i1030" type="#_x0000_t75" style='width:123pt;height:15.75pt' o:ole="">
 <v:imagedata src="Sec3-2.files/image011.wmz" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=164 height=21
src="Sec3-2.files/image010.gif" v:shapes="_x0000_i1030"><![endif]></span><!--[if gte mso 9]><xml>
 <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1030"
  DrawAspect="Content" ObjectID="_1069416774">
 </o:OLEObject>
</xml><![endif]--></span><span lang=ZH-CN style='font-size:12.0pt;font-family:
宋体;color:#333399'>在</span><span lang=EN-US style='font-size:12.0pt;font-family:
宋体;color:#333399'>x=0</span><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#333399'>附近的根，精度满足</span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#333399'><span style='position:
relative;top:7.0pt;mso-text-raise:-7.0pt'><!--[if gte vml 1]><v:shape id="_x0000_i1031"
 type="#_x0000_t75" style='width:77.25pt;height:20.25pt' o:ole="">
 <v:imagedata src="Sec3-2.files/image013.wmz" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=103 height=27
src="Sec3-2.files/image012.gif" v:shapes="_x0000_i1031"><![endif]></span><!--[if gte mso 9]><xml>
 <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1031"
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 </o:OLEObject>
</xml><![endif]--></span><span lang=ZH-CN style='font-size:12.0pt;font-family:
宋体;color:#333399'>时停止迭代，并规定最多迭代</span><span lang=EN-US style='font-size:12.0pt;
font-family:宋体;color:#333399'>50</span><span lang=ZH-CN style='font-size:12.0pt;
font-family:宋体;color:#333399'>次。牛顿迭代公式为</span><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;color:#333399'><span style='position:
relative;top:7.0pt;mso-text-raise:-7.0pt'><!--[if gte vml 1]><v:shape id="_x0000_i1032"
 type="#_x0000_t75" style='width:123.75pt;height:20.25pt' o:ole="">
 <v:imagedata src="Sec3-2.files/image024.wmz" o:title=""/>
</v:shape><![endif]--><![if !vml]><img border=0 width=165 height=27
src="Sec3-2.files/image014.gif" v:shapes="_x0000_i1032"><![endif]></span><!--[if gte mso 9]><xml>
 <o:OLEObject Type="Embed" ProgID="Equation.DSMT4" ShapeID="_x0000_i1032"
  DrawAspect="Content" ObjectID="_1069416776">
 </o:OLEObject>
</xml><![endif]--></span><span lang=ZH-CN style='font-size:12.0pt;font-family:
宋体;color:#333399'>。</span><span lang=EN-US style='font-size:12.0pt;font-family:
宋体;color:#333399'><o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:35.4pt;text-indent:-35.4pt;mso-char-indent-count:
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style='font-size:12.0pt;font-family:宋体;color:#333399'><o:p>&nbsp;</o:p></span></p>

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