📄 例5-3.mht
字号:
"Times New Roman"'>，计算</span><i style=3D'mso-bidi-font=
-style:
normal'><span lang=3DEN-US>y</span></i><span style=3D'font-family:SimSun;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Ro=
man"'>的值。其中：</span></p>
<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span lang=
=3DEN-US><sub><!--[if gte vml 1]><v:shapetype
id=3D"_x0000_t75" coordsize=3D"21600,21600" o:spt=3D"75" o:preferrelative=
=3D"t"
path=3D"m@4@5l@4@11@9@11@9@5xe" filled=3D"f" stroked=3D"f">
<v:stroke joinstyle=3D"miter"/>
<v:formulas>
<v:f eqn=3D"if lineDrawn pixelLineWidth 0"/>
<v:f eqn=3D"sum @0 1 0"/>
<v:f eqn=3D"sum 0 0 @1"/>
<v:f eqn=3D"prod @2 1 2"/>
<v:f eqn=3D"prod @3 21600 pixelWidth"/>
<v:f eqn=3D"prod @3 21600 pixelHeight"/>
<v:f eqn=3D"sum @0 0 1"/>
<v:f eqn=3D"prod @6 1 2"/>
<v:f eqn=3D"prod @7 21600 pixelWidth"/>
<v:f eqn=3D"sum @8 21600 0"/>
<v:f eqn=3D"prod @7 21600 pixelHeight"/>
<v:f eqn=3D"sum @10 21600 0"/>
</v:formulas>
<v:path o:extrusionok=3D"f" gradientshapeok=3D"t" o:connecttype=3D"rect"/>
<o:lock v:ext=3D"edit" aspectratio=3D"t"/>
</v:shapetype><v:shape id=3D"_x0000_i1025" type=3D"#_x0000_t75" style=3D'wi=
dth:105pt;
height:40.2pt' o:ole=3D"">
<v:imagedata src=3D"file7635.files/image001.wmz" o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D140 height=3D54
src=3D"file7635.files/image002.gif" v:shapes=3D"_x0000_i1025"><![endif]></s=
ub><!--[if gte mso 9]><xml>
<o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1025"
DrawAspect=3D"Content" ObjectID=3D"_1127380524">
</o:OLEObject>
</xml><![endif]--></span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>分析：该题是数=
学中的一个分段函数=
5292;它表示当</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>x</span></i><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>≥</span><span lang=3DEN-US>0</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>时，用公式</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>y=3D</span></i><span
lang=3DEN-US><sub><!--[if gte vml 1]><v:shape id=3D"_x0000_i1026" type=3D"#=
_x0000_t75"
style=3D'width:19.2pt;height:18pt' o:ole=3D"">
<v:imagedata src=3D"file7635.files/image003.wmz" o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D26 height=3D24
src=3D"file7635.files/image004.gif" v:shapes=3D"_x0000_i1026"><![endif]></s=
ub><!--[if gte mso 9]><xml>
<o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1026"
DrawAspect=3D"Content" ObjectID=3D"_1127380525">
</o:OLEObject>
</xml><![endif]--></span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>来计=
算</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>y</span></i><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>的值；当</span><i style=3D'mso-b=
idi-font-style:
normal'><span lang=3DEN-US>x</span></i><span lang=3DEN-US><0</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>时，用公式</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>y </span></i><span
lang=3DEN-US>=3D –<i style=3D'mso-bidi-font-style:normal'>x</i></span=
><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>来计算</span><i style=3D'mso-bidi-font=
-style:
normal'><span lang=3DEN-US>y</span></i><span style=3D'font-family:SimSun;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Ro=
man"'>的值。在选择条件ą=
02;，即可以选择</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>x</span></i><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>≥</span><span lang=3DEN-US>0</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>作为条件，也可=
以选择</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>x</span></i><span
lang=3DEN-US><0</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>作为=
条件。在这里，选</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>x</span></i><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>≥</span><span lang=3DEN-US>0</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>作为选择条件。=
这时，当</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>x</span></i><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>≥</span><span lang=3DEN-US>0</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>为真时，执行</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>y</span></i><span
lang=3DEN-US>=3D<sub><!--[if gte vml 1]><v:shape id=3D"_x0000_i1027" type=
=3D"#_x0000_t75"
style=3D'width:19.2pt;height:18pt' o:ole=3D"">
<v:imagedata src=3D"file7635.files/image003.wmz" o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D26 height=3D24
src=3D"file7635.files/image004.gif" v:shapes=3D"_x0000_i1027"><![endif]></s=
ub><!--[if gte mso 9]><xml>
<o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1027"
DrawAspect=3D"Content" ObjectID=3D"_1127380526">
</o:OLEObject>
</xml><![endif]--></span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>；为=
假时，执行</span><i
style=3D'mso-bidi-font-style:normal'><span lang=3DEN-US>y </span></i><span
lang=3DEN-US>=3D –<i style=3D'mso-bidi-font-style:normal'>x</i></span=
><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>设计步骤如下：=
</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>①</span> <span style=3D'font-family:SimSun;mso-asc=
ii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>建立=
应用程序用户界面与=
5774;置对象属性，如图</span=
><span
lang=3DEN-US>5-1</span><span style=3D'font-family:SimSun;mso-ascii-font-fam=
ily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>所示=
。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><span
style=3D'mso-spacerun:yes'> </span></span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>②</span> <span style=3D'font-family:SimSun;mso-asc=
ii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>编写=
事件代码。命令按钮</s=
pan><span
lang=3DEN-US>Command1</span><span style=3D'font-family:SimSun;mso-ascii-fon=
t-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>的单=
击（</span><span
lang=3DEN-US>Click</span><span style=3D'font-family:SimSun;mso-ascii-font-f=
amily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>）事=
件代码为：</span></p>
<p class=3Da><b style=3D'mso-bidi-font-weight:normal'><span lang=3DEN-US>Pr=
ivate Sub
Command1_<span class=3DGramE>Click()</span><o:p></o:p></span></b></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Dim x
As Single, y As Single<span style=3D'mso-spacerun:yes'> <=
/span><span
style=3D'mso-tab-count:3'> &=
nbsp; &nbs=
p; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>定义</span><span
lang=3DEN-US>x</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>、</span><span lang=3DEN-US>=
y</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>为单精度数</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>x =3D
Val(Text1.Text)<span style=3D'mso-spacerun:yes'> </span><span
style=3D'mso-tab-count:5'> &=
nbsp; &nbs=
p; &=
nbsp; </span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>输入</span><span
lang=3DEN-US>x</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>的值</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>If x
>=3D 0 Then y =3D <span class=3DSpellE>Sqr</span>(x) Else y =3D -x<span
style=3D'mso-spacerun:yes'> </span><span style=3D'mso-tab=
-count:
2'> =
</span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>判断并计&#=
31639;</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'>
</span>Text2.Text =3D y<span style=3D'mso-spacerun:yes'> </span><span
style=3D'mso-tab-count:6'> &=
nbsp; &nbs=
p; &=
nbsp; &nbs=
p; </span>'
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