Arithmetic expression lexical and syntax analysis, recursive descent method, type Quaternion

suanfuyouxian2
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..............\...\suanfuyouxian2
..............\...\..............\Frame1.java~219~
..............\...\..............\Frame1.java~220~
..............\...\..............\Frame1.java~221~
..............\...\..............\Frame1.java~222~
..............\...\..............\Frame1.java~223~
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..............\...\..............\Frame1.java~225~
..............\...\..............\Frame1.java~226~
..............\...\..............\Frame1.java~227~
..............\...\..............\Frame1.java~228~
..............\...\..............\Frame1_AboutBox.java~1~
..............\...\..............\Frame1_AboutBox.java~2~
..............\...\..............\Frame1_AboutBox.java~3~
..............\...\..............\Frame1_AboutBox.java~4~
..............\...\..............\Stack.java~1~
..............\...\..............\Stack.java~2~
..............\...\..............\Stack.java~3~
..............\...\..............\Stack.java~4~
..............\...\..............\Stack.java~5~
..............\...\..............\StringTok.java~1~
..............\...\..............\StringTok.java~2~
..............\...\..............\StringTok.java~3~
..............\...\..............\StringTok.java~4~
..............\...\..............\StringTok.java~5~
..............\classes
..............\.......\package cache
..............\.......\.............\suanfuyouxian2.dep2
..............\.......\suanfuyouxian2
..............\.......\..............\about.png
..............\.......\..............\Application1$1.class
..............\.......\..............\Application1.class
..............\.......\..............\Frame1.class
..............\.......\..............\Frame1_AboutBox.class
..............\.......\..............\Frame1_jButton1_actionAdapter.class
..............\.......\..............\Frame1_jMenuFileExit_ActionAdapter.class
..............\.......\..............\Frame1_jMenuHelpAbout_ActionAdapter.class

..............\.......\..............\Stack.class
..............\.......\..............\StringTok.class
..............\src
..............\...\suanfuyouxian2
..............\...\..............\about.png
..............\...\..............\Application1.java
..............\...\..............\Frame1.java
..............\...\..............\Frame1_AboutBox.java

..............\...\..............\Stack.java
..............\...\..............\StringTok.java
..............\suanfuyouxian2.jpx
..............\suanfuyouxian2.jpx.local
..............\suanfuyouxian2.jpx.local~

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