📄 例8-9.mht
字号:
</span></p>
<p class=3Da><b><span lang=3DEN-US>Private Sub <span class=3DSpellE>Form_Cl=
ick</span>()<o:p></o:p></span></b></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Dim a
As Integer, b As Integer</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>a =3D
10<span style=3D'mso-spacerun:yes'> </span><span
style=3D'mso-tab-count:7'> &=
nbsp; &nbs=
p; &=
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"'>在主程序&#=
20013;变量的原值</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>b =3D
20<span style=3D'mso-spacerun:yes'> </span><span
style=3D'mso-tab-count:7'> &=
nbsp; &nbs=
p; &=
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"'>在主程序&#=
20013;变量的原值</span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>tryout
a, b<span
style=3D'mso-spacerun:yes'>
</span><span style=3D'mso-tab-count:5'> =
&nb=
sp; =
</span>'
</span><span class=3DGramE><span style=3D'font-family:SimSun;mso-ascii-font=
-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>传址=
调用</span></span></p>
<p class=3Da><span lang=3DEN-US><span style=3D'mso-spacerun:yes'> </s=
pan>Print
"a=3D"; a, "b=3D"; b<span style=3D'mso-spacerun:yes'>&n=
bsp;
</span><span style=3D'mso-tab-count:5'> =
&nb=
sp; =
</span>'
</span><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New R=
oman";
mso-hansi-font-family:"Times New Roman"'>在主程序&#=
20013;输出变量的值</span></p>
<p class=3Da><b><span lang=3DEN-US>End Sub<o:p></o:p></span></b></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"'>在事件过程中，=
由于通过“</span><span
lang=3DEN-US>tryout a, b</span><span style=3D'font-family:SimSun;mso-ascii-=
font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>”语&=
#21477;调用过程</span><span
lang=3DEN-US>tryout</span><span style=3D'font-family:SimSun;mso-ascii-font-=
family:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>，实=
参</span><span
lang=3DEN-US>a</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>和</span><span lang=3DEN-US>=
b</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>的值分别为</span><span
lang=3DEN-US>10</span><span style=3D'font-family:SimSun;mso-ascii-font-fami=
ly:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>和</span><span lang=3DEN-US>=
20</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>，传送给</span><span lang=3DEN-U=
S>tryout</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>后进行计算，在=
通用过程中输出的</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"'>和</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"'>分别为</span><span lang=3DEN-US>110</s=
pan><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>和</span><span lang=3DEN-US>120</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>，而在事件过程=
中输出的</span><span
lang=3DEN-US>a</span><span style=3D'font-family:SimSun;mso-ascii-font-famil=
y:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>和</span><span lang=3DEN-US>=
b</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>同样为</span><span lang=3DEN-US>110</s=
pan><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>和</span><span lang=3DEN-US>120</span><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
"Times New Roman"'>。运行上述程序=
后，输出结果如图</span><span
lang=3DEN-US>8-16</span><span style=3D'font-family:SimSun;mso-ascii-font-fa=
mily:
"Times New Roman";mso-hansi-font-family:"Times New Roman"'>所示=
。</span></p>
<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span lang=
=3DEN-US><!--[if gte vml 1]><v:shapetype
id=3D"_x0000_t75" coordsize=3D"21600,21600" o:spt=3D"75" o:preferrelative=
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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:105.6pt;
height:42.6pt'>
<v:imagedata src=3D"file0713.files/image001.png" o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D141 height=3D57
src=3D"file0713.files/image002.jpg" v:shapes=3D"_x0000_i1025"><![endif]></s=
pan></p>
<h6><span style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roma=
n";
mso-hansi-font-family:Roman'>图</span><span lang=3DEN-US>8-16<span
style=3D'mso-spacerun:yes'> </span></span><span class=3DGramE><span
style=3D'font-family:SimSun;mso-ascii-font-family:"Times New Roman";mso-han=
si-font-family:
Roman'>传址调用</span></span></h6>
<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"'>出现这种现象的=
原因是：变量（即实=
1442;）的值存放在内存௚=
0;某个地址中，当通过&=
#24341;用来调用一个过程=
102;，向该过程传送变量=
;，实际上是把变量的&#=
22320;址传送给该过程，Þ=
40;此，变量的地址和被=
调用过程中相应参数=
0340;地址是相同的。这੫=
9;，如果通用过程中的&=
#25805;作修改了参数的值A=
292;则它同时也修改了传=
;送给过程的变量的值&#=
12290;如果不希望在调用Ű=
07;程时改变变量的值，=
则应把变量的值传送=
2473;参数，即传值。</span></p>
<p class=3DMsoNormal><span lang=3DEN-US><o:p> </o:p></span></p>
</div>
</body>
</html>
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