Lexical analysis, often use advanced search method. If the current to be analysed for "a+" string, the current characters to ", this time, is really the parser analysis for greater than or equal to relational operators greater than shut is operator? Obviously, only know the next character is what will jump to conclusions. So the parser read the next character + , then CPC should be explanation for greater than operator. But at the moment, the leading read a characters + , so want to back a character, lexical analyzer to normal operation. On the analysis of the identifier, unsigned integer etc also has a similar situation.

词法分析\M9KU]Z)CVK$OQ8JXTVJDGCK.jpg
........\Q%5QH0X8[GBXG}9I8T$SXJI.jpg
........\$C1$`IOGB9_~_2SG]ZPD$5W.jpg
........\DU}R8]MJSO6VQK_$P8MC4CN.jpg
........\source.txt
........\a.cpp
........\Thumbs.db
........\a.dsp
........\Debug\vc60.idb
........\.....\vc60.pdb
........\.....\a.pch
........\.....\a.obj
........\.....\a.ilk
........\.....\a.exe
........\.....\a.pdb
........\a.ncb
........\a.plg
........\a.opt
........\a.dsw
........\Debug
词法分析

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