📄 m39 - creating and managing variables - 34 of 36.mht
字号:
From: <Saved by Microsoft Internet Explorer 5>
Subject:
Date: Mon, 8 Mar 2004 12:18:20 +0800
MIME-Version: 1.0
Content-Type: multipart/related;
boundary="----=_NextPart_000_0000_01C40507.71B67770";
type="text/html"
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165
This is a multi-part message in MIME format.
------=_NextPart_000_0000_01C40507.71B67770
Content-Type: text/html;
charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable
Content-Location: http://www.sas.com/apps/OLTRN/59080/m39/m39_34.htm
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><!-- InstanceBegin template=3D"/Templates/summary.dwt" =
codeOutsideHTMLIsLocked=3D"false" -->
<SCRIPT language=3DJavaScript=20
src=3D"http://www.sas.com/apps/OLTRN/59080/tut.js">=0A=
</SCRIPT>
<SCRIPT language=3DJavaScript>=0A=
setPageTitle();=0A=
setCookie();=0A=
fixedTitle=3D"Lesson Summary";=0A=
=0A=
// Drop down menu link- =A9 Dynamic Drive (www.dynamicdrive.com)=0A=
// For full source code and 100's more DHTML scripts, visit =
http://www.dynamicdrive.com=0A=
// Credit MUST stay intact for use -->=0A=
=0A=
</SCRIPT>
<!-- InstanceBeginEditable name=3D"extrascript" -->
<SCRIPT language=3DJavaScript>=0A=
</SCRIPT>
<!-- InstanceEndEditable --><LINK=20
href=3D"http://www.sas.com/apps/OLTRN/59080/tut.css" rel=3Dstylesheet>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dwindows-1252">
<META content=3D"MSHTML 6.00.2800.1400" name=3DGENERATOR></HEAD>
<BODY bgColor=3D#fffff0 leftMargin=3D0 topMargin=3D0 rightMargin=3D0 =
marginwidth=3D"0"=20
marginheight=3D"0">
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"100%"=20
background=3Dhttp://www.sas.com/apps/elearning/images/en/navimages/banner=
.gif=20
border=3D0>
<TBODY>
<TR>
<TD noWrap colSpan=3D2 height=3D49><FONT face=3D"Arial, Helvetica, =
sans-serif"=20
color=3D#a6caf0 size=3D-1>
<SCRIPT>setCourseTitle()</SCRIPT>
</FONT><BR><STRONG><FONT face=3D"Arial, Helvetica, sans-serif"=20
color=3D#ffffff size=3D-1>
<SCRIPT>setLessonTitle()</SCRIPT>
</FONT></STRONG> <IMG height=3D8 alt=3D""=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/bullet.gif" =
width=3D8> <FONT color=3D#ffffff size=3D2><STRONG>
<SCRIPT>document.write(myPage+" of "+eval(myModule))</SCRIPT>
</STRONG></FONT> </TD>
<TD vAlign=3Dbottom width=3D357 rowSpan=3D3><IMG height=3D72 =
alt=3D""=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/logo_top.gif=
"=20
width=3D357 align=3Dbottom></TD></TR>
<TR>
<TD vAlign=3Dbottom noWrap colSpan=3D2><IMG height=3D19 alt=3D""=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/tableft.gif"=
=20
width=3D9><A=20
onmouseover=3D"rOver('back');window.status=3D'Display the previous =
page.';return true"=20
accessKey=3Db onmouseout=3D"rOut('back');window.status=3D'';return =
true"=20
href=3D"javascript:%20prevPage()"><IMG height=3D19 alt=3Dback=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/back.gif"=20
width=3D30 border=3D0 name=3Dback></A><A=20
onmouseover=3D"rOver('next');window.status=3D'Display the next =
page.';return true"=20
accessKey=3Dn onmouseout=3D"rOut('next');window.status=3D'';return =
true"=20
href=3D"javascript:%20nextPage()"><IMG height=3D19 alt=3Dnext=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/next.gif"=20
width=3D30 border=3D0 name=3Dnext></A>
<SCRIPT>writeLessonMenu()</SCRIPT>
<A=20
onmouseover=3D"rOver('path');window.status=3D'Display the Learning =
Path.';return true"=20
accessKey=3Dp onmouseout=3D"rOut('path');window.status=3D'';return =
true"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/paths.htm"><IMG =
height=3D19=20
alt=3D"Learning Path"=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/path.gif"=20
width=3D48 border=3D0 name=3Dpath></A>
<SCRIPT>writeHelpMenu()</SCRIPT>
<IMG height=3D19 alt=3D""=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/tabright.gif=
"=20
width=3D28></TD></TR>
<TR>
<TD vAlign=3Dbottom colSpan=3D2 height=3D3><IMG height=3D3 alt=3D""=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/border.gif" =
width=3D"100%"></TD></TR>
<TR vAlign=3Dtop bgColor=3D#fffff0>
<TD noWrap> </TD>
<TD vAlign=3Dcenter><BR><IMG height=3D1 alt=3D""=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/cleardot.gif=
"=20
width=3D411><BR><FONT face=3D"Arial, Helvetica, sans-serif" =
color=3D#003399=20
size=3D3><STRONG>
<SCRIPT>document.write(fixedTitle)</SCRIPT>
</STRONG></FONT></TD>
<TD><IMG height=3D64 alt=3D""=20
=
src=3D"http://www.sas.com/apps/elearning/images/en/navimages/arch.gif"=20
width=3D357 align=3Dtop></TD></TR></TBODY></TABLE><BR>
<CENTER>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" align=3Dcenter =
border=3D0>
<TBODY>
<TR>
<TD align=3Dleft>
<P>This page contains </P>
<UL><!-- InstanceBeginEditable name=3D"links" -->
<LI><A onmouseover=3D"window.status=3D'Go to the text summary =
section.'; "=20
onmouseout=3D"window.status=3D''"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_34.htm#Text">a text=20
summary of the material taught in the lesson</A>=20
<LI><A onmouseover=3D"window.status=3D'Go to the syntax =
section.'; "=20
onmouseout=3D"window.status=3D''"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_34.htm#Syntax">syntax=
=20
for statements and options</A>=20
<LI><A onmouseover=3D"window.status=3D'Go to the sample program =
section.'; "=20
onmouseout=3D"window.status=3D''"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_34.htm#Sample">a =
;sample=20
program</A>=20
<LI><A=20
onmouseover=3D"window.status=3D'Go to the points to remember =
section.'; "=20
onmouseout=3D"window.status=3D''"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_34.htm#Points">points=
=20
to remember</A>. <!-- InstanceEndEditable --></LI></UL>
<P>
<HR>
</TD></TR></TBODY></TABLE>
<P>
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" align=3Dcenter =
border=3D0>
<TBODY>
<TR>
<TD align=3Dleft>
<H2><STRONG><A name=3DText>Text Summary</A></STRONG> </H2>
<P><EM>To go to the page where a task, programming feature, or=20
concept was presented, select a=20
link.</EM></P></TD></TR></TBODY></TABLE><BR><!-- InstanceBeginEditable =
name=3D"textsummary" -->
<TABLE cellSpacing=3D0 cellPadding=3D0 width=3D"85%" align=3Dcenter =
border=3D0>
<TBODY>
<TR vAlign=3Dtop>
<TD>
<P><STRONG>Accumulating Totals</STRONG><BR>Use a <FONT =
color=3D#003399><A=20
onmouseover=3D"window.status=3D'Display details on the sum =
statement.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_2.htm">sum=20
statement</A></FONT> to add the result of an expression to an =
accumulator=20
variable. <BR><BR><STRONG>Initializing Sum =
Variables</STRONG><BR>You can=20
use the <FONT color=3D#003399><A=20
onmouseover=3D"window.status=3D'Display details on the RETAIN =
statement.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_5.htm">RETAIN=20
statement</A></FONT> to assign an initial value to a variable =
whose value=20
is assigned by a sum statement. </P>
<P><STRONG>Assigning Values Conditionally</STRONG><BR>To perform =
an action=20
conditionally, use an <FONT color=3D#003399><A=20
onmouseover=3D"window.status=3D'Display details on the IF-THEN =
statement.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_8.htm">IF-THEN =
statement</A></FONT>. The IF-THEN statement executes a SAS =
statement when=20
the condition in the IF clause is true. You can include <FONT=20
color=3D#003399><A=20
onmouseover=3D"window.status=3D'Display details on comparison and =
logical operators.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
=
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_9.htm">comparison =
and=20
logical operators</A></FONT>; logical comparisons that are =
enclosed in=20
parentheses are evaluated as true or false before other =
expressions are=20
evaluated. Use the <FONT color=3D#003399><A=20
onmouseover=3D"window.status=3D'Display details on the ELSE =
statement.';"=20
onclick=3DsuggestBack() onmouseout=3D"window.status=3D''"=20
href=3D"http://www.sas.com/apps/OLTRN/59080/m39/m39_13.htm">ELSE=20
statement</A></FONT> to specify an alternative action when the =
condition=20
in an IF-THEN statement is false.=20
<P><STRONG>Specifying Lengths for Variables</STRONG><BR>When =
⌨️ 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 + -