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语法错误；未定义的控制序列 \EndIf

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语法错误；未定义的控制序列 \EndIf

当我编译时出现以下错误：

Syntax error; Undefined control sequence \EndIf

代码：

\usepackage{algorithm2e} 

\begin{algorithm}[h]
\label{FecEncodeAndSendFECUnits}
\caption{Function for Receiving and FEC-decoding FEC-encoded Units of Data}
\KwIn{}
%\KwOut{codeRate}

         nrOfPacketsReceived = 0             HIGHEST\_FEC\_UNIT\_NR\_DECODED\_GLOBAL=0          \While{$true$}
            currentPacket = ListenToSocketForNewPkt ()              $ nrOfPacketsReceived++ $               $ currentFecUnit =ExtractValueOfPktHeader(currentPacket, FEC_UNIT_GLOBAL) $                 $ currentFecUnitModulo$ = $currentFecUnit$ \% NR\_OF\_PARALLELL\_FEC\_UNITS\_GLOBAL $               $ currentSymbolNr$ = ExtractValueOfPktHeader($currentPacket$, SYMBOL\_NR\_GLOBAL) $                   packetForCurrentFecUnitGlobal[$currentFecUnitModulo$][$currentSymbolNr$] = ExtractDataOfPkt ($currentPacket$)                 \If { $ currentFecUnit$ > $HIGHEST_FEC_UNIT_NR_DECODED_GLOBAL$ OR
            ( currentFecUnit == 0 AND   nrOfPacketsReceived == 1 ) }
              ExtractPktHeaderAndPutIntoGlobalFecUnitHeaderValues () 
            \EndIf

             \If {currentFecUnit > HIGHEST\_FEC\_UNIT\_NR\_DECODED\_GLOBAL }            
                lastFecUnitModulo  = (currentFecUnit -1 ) \% NR\_OF\_PARALLELL\_FEC\_UNITS\_GLOBAL                      DecodeFECUnit (lastFecUnitModulo, nrOfSrcSymbolsGlobal[lastFecUnitModulo], nrOfTotalSymbolsGlobal[lastFecUnitModulo], symbolSizeGlobal[lastFecUnitModulo], rateOfRedundantPkts[lastFecUnitModulo]) \\

                $ HIGHEST\_FEC\_UNIT\_NR\_DECODED\_GLOBAL++$ \  
             \EndIf

        \EndWhile               

\end{algorithm}

我该如何解决这个问题？

答案1

没有\EndIfnor \EndWhile；您必须使用括号来指定范围：

\If{<condition>}{<instructions>}
\While{<condition>}{<instructions>}

因此，就您而言，您可以使用（我不确定是否\\在某些时候插入行更改命令）：

\documentclass{article}
\usepackage{algorithm2e} 

\begin{document}

\begin{algorithm}[h]
\label{FecEncodeAndSendFECUnits}
\caption{Function for Receiving and FEC-decoding FEC-encoded Units of Data}
\KwIn{}
%\KwOut{codeRate}

         nrOfPacketsReceived = 0              HIGHEST\_FEC\_UNIT\_NR\_DECODED\_GLOBAL=0 \\
        \While{$true$}{
            currentPacket = ListenToSocketForNewPkt ()                 $ nrOfPacketsReceived++ $                 $ currentFecUnit =ExtractValueOfPktHeader(currentPacket, FEC_UNIT_GLOBAL) $                 $ currentFecUnitModulo$ = $currentFecUnit$ \% NR\_OF\_PARALLELL\_FEC\_UNITS\_GLOBAL $                 $ currentSymbolNr$ = ExtractValueOfPktHeader($currentPacket$, SYMBOL\_NR\_GLOBAL) $                   packetForCurrentFecUnitGlobal[$currentFecUnitModulo$][$currentSymbolNr$] = ExtractDataOfPkt ($currentPacket$) \\
            \If{ $ currentFecUnit$ > $HIGHEST_FEC_UNIT_NR_DECODED_GLOBAL$ OR
            ( currentFecUnit == 0 AND   nrOfPacketsReceived == 1 ) }{
              ExtractPktHeaderAndPutIntoGlobalFecUnitHeaderValues () 
            }

             \If {currentFecUnit > HIGHEST\_FEC\_UNIT\_NR\_DECODED\_GLOBAL }{            
                lastFecUnitModulo  = (currentFecUnit -1 ) \% NR\_OF\_PARALLELL\_FEC\_UNITS\_GLOBAL                      DecodeFECUnit (lastFecUnitModulo, nrOfSrcSymbolsGlobal[lastFecUnitModulo], nrOfTotalSymbolsGlobal[lastFecUnitModulo], symbolSizeGlobal[lastFecUnitModulo], rateOfRedundantPkts[lastFecUnitModulo]) \\

                $ HIGHEST\_FEC\_UNIT\_NR\_DECODED\_GLOBAL++$ \  
             }
        }               
\end{algorithm}

\end{document}

在此处输入图片描述

附注：algorithmicx这个包可能会引起您的兴趣；它具有强大的功能并且可高度定制。

答案2

您正在将包algorithm2e( \KwIn) 与包混合使用algorithmicx。后者使用

\If{<body>}
  <then block>
\EndIf
% also with else branches
\While{<condition>}
  <body>
\EndWhile

而包algorithm2e提供了

\If{<condition>}{<then block>}
\While{<condition>}{<body>}

以及许多其他形式。

决定要使用哪个包并阅读其文档。

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