Source

lapr4_cleansheets_v2 / doc / api / csheets / core / formula / lang / Factorial.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!--NewPage-->
<HTML>
<HEAD>
<!-- Generated by javadoc (build 1.6.0_26) on Fri Feb 03 14:01:24 WET 2012 -->
<TITLE>
Factorial (CleanSheets Javadoc Documentation)
</TITLE>

<META NAME="date" CONTENT="2012-02-03">

<LINK REL ="stylesheet" TYPE="text/css" HREF="../../../../stylesheet.css" TITLE="Style">

<SCRIPT type="text/javascript">
function windowTitle()
{
    if (location.href.indexOf('is-external=true') == -1) {
        parent.document.title="Factorial (CleanSheets Javadoc Documentation)";
    }
}
</SCRIPT>
<NOSCRIPT>
</NOSCRIPT>

</HEAD>

<BODY BGCOLOR="white" onload="windowTitle();">
<HR>


<!-- ========= START OF TOP NAVBAR ======= -->
<A NAME="navbar_top"><!-- --></A>
<A HREF="#skip-navbar_top" title="Skip navigation links"></A>
<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY="">
<TR>
<TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
<A NAME="navbar_top_firstrow"><!-- --></A>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
  <TR ALIGN="center" VALIGN="top">
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/Factorial.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>
  </TR>
</TABLE>
</TD>
<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
</EM>
</TD>
</TR>

<TR>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
&nbsp;<A HREF="../../../../csheets/core/formula/lang/Exponentiator.html" title="class in csheets.core.formula.lang"><B>PREV CLASS</B></A>&nbsp;
&nbsp;<A HREF="../../../../csheets/core/formula/lang/False.html" title="class in csheets.core.formula.lang"><B>NEXT CLASS</B></A></FONT></TD>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
  <A HREF="../../../../index.html?csheets/core/formula/lang/Factorial.html" target="_top"><B>FRAMES</B></A>  &nbsp;
&nbsp;<A HREF="Factorial.html" target="_top"><B>NO FRAMES</B></A>  &nbsp;
&nbsp;<SCRIPT type="text/javascript">
  <!--
  if(window==top) {
    document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>');
  }
  //-->
</SCRIPT>
<NOSCRIPT>
  <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>
</NOSCRIPT>


</FONT></TD>
</TR>
<TR>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
DETAIL:&nbsp;<A HREF="#field_detail">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_detail">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
</TR>
</TABLE>
<A NAME="skip-navbar_top"></A>
<!-- ========= END OF TOP NAVBAR ========= -->

<HR>
<!-- ======== START OF CLASS DATA ======== -->
<H2>
<FONT SIZE="-1">
csheets.core.formula.lang</FONT>
<BR>
Class Factorial</H2>
<PRE>
java.lang.Object
  <IMG SRC="../../../../resources/inherit.gif" ALT="extended by "><B>csheets.core.formula.lang.Factorial</B>
</PRE>
<DL>
<DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../../csheets/core/formula/Function.html" title="interface in csheets.core.formula">Function</A></DD>
</DL>
<HR>
<DL>
<DT><PRE>public class <A HREF="../../../../src-html/csheets/core/formula/lang/Factorial.html#line.33"><B>Factorial</B></A><DT>extends java.lang.Object<DT>implements <A HREF="../../../../csheets/core/formula/Function.html" title="interface in csheets.core.formula">Function</A></DL>
</PRE>

<P>
A function that returns the factorial of its argument.
<P>

<P>
<DL>
<DT><B>Author:</B></DT>
  <DD>Einar Pehrson</DD>
</DL>
<HR>

<P>
<!-- =========== FIELD SUMMARY =========== -->

<A NAME="field_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Field Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>static&nbsp;<A HREF="../../../../csheets/core/formula/FunctionParameter.html" title="class in csheets.core.formula">FunctionParameter</A>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../csheets/core/formula/lang/Factorial.html#parameters">parameters</A></B></CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The only parameter: a numeric term</TD>
</TR>
</TABLE>
&nbsp;
<!-- ======== CONSTRUCTOR SUMMARY ======== -->

<A NAME="constructor_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Constructor Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE><B><A HREF="../../../../csheets/core/formula/lang/Factorial.html#Factorial()">Factorial</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Creates a new instance of the FACT function.</TD>
</TR>
</TABLE>
&nbsp;
<!-- ========== METHOD SUMMARY =========== -->

<A NAME="method_summary"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
<B>Method Summary</B></FONT></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../csheets/core/Value.html" title="class in csheets.core">Value</A></CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../csheets/core/formula/lang/Factorial.html#applyTo(csheets.core.formula.Expression[])">applyTo</A></B>(<A HREF="../../../../csheets/core/formula/Expression.html" title="interface in csheets.core.formula">Expression</A>[]&nbsp;arguments)</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Invokes the function using the given arguments and returns the result.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;java.lang.String</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../csheets/core/formula/lang/Factorial.html#getIdentifier()">getIdentifier</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the operator's string identirifer.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;<A HREF="../../../../csheets/core/formula/FunctionParameter.html" title="class in csheets.core.formula">FunctionParameter</A>[]</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../csheets/core/formula/lang/Factorial.html#getParameters()">getParameters</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns the parameters of the function.</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
<CODE>&nbsp;boolean</CODE></FONT></TD>
<TD><CODE><B><A HREF="../../../../csheets/core/formula/lang/Factorial.html#isVarArg()">isVarArg</A></B>()</CODE>

<BR>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Returns whether the function accepts a variable number of arguments,
 i.e.</TD>
</TR>
</TABLE>
&nbsp;<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
<TH ALIGN="left"><B>Methods inherited from class java.lang.Object</B></TH>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD><CODE>clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait</CODE></TD>
</TR>
</TABLE>
&nbsp;
<P>

<!-- ============ FIELD DETAIL =========== -->

<A NAME="field_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Field Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="parameters"><!-- --></A><H3>
parameters</H3>
<PRE>
public static final <A HREF="../../../../csheets/core/formula/FunctionParameter.html" title="class in csheets.core.formula">FunctionParameter</A>[] <A HREF="../../../../src-html/csheets/core/formula/lang/Factorial.html#line.36"><B>parameters</B></A></PRE>
<DL>
<DD>The only parameter: a numeric term
<P>
<DL>
</DL>
</DL>

<!-- ========= CONSTRUCTOR DETAIL ======== -->

<A NAME="constructor_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Constructor Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="Factorial()"><!-- --></A><H3>
Factorial</H3>
<PRE>
public <A HREF="../../../../src-html/csheets/core/formula/lang/Factorial.html#line.44"><B>Factorial</B></A>()</PRE>
<DL>
<DD>Creates a new instance of the FACT function.
<P>
</DL>

<!-- ============ METHOD DETAIL ========== -->

<A NAME="method_detail"><!-- --></A>
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
<B>Method Detail</B></FONT></TH>
</TR>
</TABLE>

<A NAME="getIdentifier()"><!-- --></A><H3>
getIdentifier</H3>
<PRE>
public java.lang.String <A HREF="../../../../src-html/csheets/core/formula/lang/Factorial.html#line.46"><B>getIdentifier</B></A>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../csheets/core/formula/Function.html#getIdentifier()">Function</A></CODE></B></DD>
<DD>Returns the operator's string identirifer.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../csheets/core/formula/Function.html#getIdentifier()">getIdentifier</A></CODE> in interface <CODE><A HREF="../../../../csheets/core/formula/Function.html" title="interface in csheets.core.formula">Function</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>a string representation of the operator.</DL>
</DD>
</DL>
<HR>

<A NAME="applyTo(csheets.core.formula.Expression[])"><!-- --></A><H3>
applyTo</H3>
<PRE>
public <A HREF="../../../../csheets/core/Value.html" title="class in csheets.core">Value</A> <A HREF="../../../../src-html/csheets/core/formula/lang/Factorial.html#line.50"><B>applyTo</B></A>(<A HREF="../../../../csheets/core/formula/Expression.html" title="interface in csheets.core.formula">Expression</A>[]&nbsp;arguments)
              throws <A HREF="../../../../csheets/core/IllegalValueTypeException.html" title="class in csheets.core">IllegalValueTypeException</A></PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../csheets/core/formula/Function.html#applyTo(csheets.core.formula.Expression[])">Function</A></CODE></B></DD>
<DD>Invokes the function using the given arguments and returns the result.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../csheets/core/formula/Function.html#applyTo(csheets.core.formula.Expression[])">applyTo</A></CODE> in interface <CODE><A HREF="../../../../csheets/core/formula/Function.html" title="interface in csheets.core.formula">Function</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the result of the operation
<DT><B>Throws:</B>
<DD><CODE><A HREF="../../../../csheets/core/IllegalValueTypeException.html" title="class in csheets.core">IllegalValueTypeException</A></CODE></DL>
</DD>
</DL>
<HR>

<A NAME="getParameters()"><!-- --></A><H3>
getParameters</H3>
<PRE>
public <A HREF="../../../../csheets/core/formula/FunctionParameter.html" title="class in csheets.core.formula">FunctionParameter</A>[] <A HREF="../../../../src-html/csheets/core/formula/lang/Factorial.html#line.61"><B>getParameters</B></A>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../csheets/core/formula/Function.html#getParameters()">Function</A></CODE></B></DD>
<DD>Returns the parameters of the function.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../csheets/core/formula/Function.html#getParameters()">getParameters</A></CODE> in interface <CODE><A HREF="../../../../csheets/core/formula/Function.html" title="interface in csheets.core.formula">Function</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>the parameters of the function</DL>
</DD>
</DL>
<HR>

<A NAME="isVarArg()"><!-- --></A><H3>
isVarArg</H3>
<PRE>
public boolean <A HREF="../../../../src-html/csheets/core/formula/lang/Factorial.html#line.65"><B>isVarArg</B></A>()</PRE>
<DL>
<DD><B>Description copied from interface: <CODE><A HREF="../../../../csheets/core/formula/Function.html#isVarArg()">Function</A></CODE></B></DD>
<DD>Returns whether the function accepts a variable number of arguments,
 i.e. whether the function's parameter list is unbounded.
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../csheets/core/formula/Function.html#isVarArg()">isVarArg</A></CODE> in interface <CODE><A HREF="../../../../csheets/core/formula/Function.html" title="interface in csheets.core.formula">Function</A></CODE></DL>
</DD>
<DD><DL>

<DT><B>Returns:</B><DD>true if the function accepts a variable number of arguments</DL>
</DD>
</DL>
<!-- ========= END OF CLASS DATA ========= -->
<HR>


<!-- ======= START OF BOTTOM NAVBAR ====== -->
<A NAME="navbar_bottom"><!-- --></A>
<A HREF="#skip-navbar_bottom" title="Skip navigation links"></A>
<TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0" SUMMARY="">
<TR>
<TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1">
<A NAME="navbar_bottom_firstrow"><!-- --></A>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3" SUMMARY="">
  <TR ALIGN="center" VALIGN="top">
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> &nbsp;<FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="class-use/Factorial.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../index-all.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A>&nbsp;</TD>
  <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1">    <A HREF="../../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A>&nbsp;</TD>
  </TR>
</TABLE>
</TD>
<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
</EM>
</TD>
</TR>

<TR>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
&nbsp;<A HREF="../../../../csheets/core/formula/lang/Exponentiator.html" title="class in csheets.core.formula.lang"><B>PREV CLASS</B></A>&nbsp;
&nbsp;<A HREF="../../../../csheets/core/formula/lang/False.html" title="class in csheets.core.formula.lang"><B>NEXT CLASS</B></A></FONT></TD>
<TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2">
  <A HREF="../../../../index.html?csheets/core/formula/lang/Factorial.html" target="_top"><B>FRAMES</B></A>  &nbsp;
&nbsp;<A HREF="Factorial.html" target="_top"><B>NO FRAMES</B></A>  &nbsp;
&nbsp;<SCRIPT type="text/javascript">
  <!--
  if(window==top) {
    document.writeln('<A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>');
  }
  //-->
</SCRIPT>
<NOSCRIPT>
  <A HREF="../../../../allclasses-noframe.html"><B>All Classes</B></A>
</NOSCRIPT>


</FONT></TD>
</TR>
<TR>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
  SUMMARY:&nbsp;NESTED&nbsp;|&nbsp;<A HREF="#field_summary">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_summary">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_summary">METHOD</A></FONT></TD>
<TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">
DETAIL:&nbsp;<A HREF="#field_detail">FIELD</A>&nbsp;|&nbsp;<A HREF="#constructor_detail">CONSTR</A>&nbsp;|&nbsp;<A HREF="#method_detail">METHOD</A></FONT></TD>
</TR>
</TABLE>
<A NAME="skip-navbar_bottom"></A>
<!-- ======== END OF BOTTOM NAVBAR ======= -->

<HR>

</BODY>
</HTML>
Tip: Filter by directory path e.g. /media app.js to search for public/media/app.js.
Tip: Use camelCasing e.g. ProjME to search for ProjectModifiedEvent.java.
Tip: Filter by extension type e.g. /repo .js to search for all .js files in the /repo directory.
Tip: Separate your search with spaces e.g. /ssh pom.xml to search for src/ssh/pom.xml.
Tip: Use ↑ and ↓ arrow keys to navigate and return to view the file.
Tip: You can also navigate files with Ctrl+j (next) and Ctrl+k (previous) and view the file with Ctrl+o.
Tip: You can also navigate files with Alt+j (next) and Alt+k (previous) and view the file with Alt+o.