資源簡介
利用flex和bison語言實現科學計算器,可以進行加減乘除、模運算、冪運算、對數運算、階乘、絕對值、三角函數運算,支持十進制,支持一些清屏、幫助的命令,支持變量儲存,可羅列、刪除。
可以用的啦!

代碼片段和文件信息
/*?A?lexical?scanner?generated?by?flex?*/
/*?Scanner?skeleton?version:
?*?$Header:?/home/daffy/u0/vern/flex/RCS/flex.sklv?2.91?96/09/10?16:58:48?vern?Exp?$
?*/
#define?FLEX_SCANNER
#define?YY_FLEX_MAJOR_VERSION?2
#define?YY_FLEX_MINOR_VERSION?5
#include?
/*?cfront?1.2?defines?“c_plusplus“?instead?of?“__cplusplus“?*/
#ifdef?c_plusplus
#ifndef?__cplusplus
#define?__cplusplus
#endif
#endif
#ifdef?__cplusplus
#include?
#include?
/*?Use?prototypes?in?function?declarations.?*/
#define?YY_USE_PROTOS
/*?The?“const“?storage-class-modifier?is?valid.?*/
#define?YY_USE_CONST
#else /*?!?__cplusplus?*/
#if?__STDC__
#define?YY_USE_PROTOS
#define?YY_USE_CONST
#endif /*?__STDC__?*/
#endif /*?!?__cplusplus?*/
#ifdef?__TURBOC__
?#pragma?warn?-rch
?#pragma?warn?-use
#include?
#include?
#define?YY_USE_CONST
#define?YY_USE_PROTOS
#endif
#ifdef?YY_USE_CONST
#define?yyconst?const
#else
#define?yyconst
#endif
#ifdef?YY_USE_PROTOS
#define?YY_PROTO(proto)?proto
#else
#define?YY_PROTO(proto)?()
#endif
/*?Returned?upon?end-of-file.?*/
#define?YY_NULL?0
/*?Promotes?a?possibly?negative?possibly?signed?char?to?an?unsigned
?*?integer?for?use?as?an?array?index.??If?the?signed?char?is?negative
?*?we?want?to?instead?treat?it?as?an?8-bit?unsigned?char?hence?the
?*?double?cast.
?*/
#define?YY_SC_TO_UI(c)?((unsigned?int)?(unsigned?char)?c)
/*?Enter?a?start?condition.??This?macro?really?ought?to?take?a?parameter
?*?but?we?do?it?the?disgusting?crufty?way?forced?on?us?by?the?()-less
?*?definition?of?BEGIN.
?*/
#define?BEGIN?yy_start?=?1?+?2?*
/*?Translate?the?current?start?state?into?a?value?that?can?be?later?handed
?*?to?BEGIN?to?return?to?the?state.??The?YYSTATE?alias?is?for?lex
?*?compatibility.
?*/
#define?YY_START?((yy_start?-?1)?/?2)
#define?YYSTATE?YY_START
/*?Action?number?for?EOF?rule?of?a?given?start?state.?*/
#define?YY_STATE_EOF(state)?(YY_END_OF_BUFFER?+?state?+?1)
/*?Special?action?meaning?“start?processing?a?new?file“.?*/
#define?YY_NEW_FILE?yyrestart(?yyin?)
#define?YY_END_OF_BUFFER_CHAR?0
/*?Size?of?default?input?buffer.?*/
#define?YY_BUF_SIZE?16384
typedef?struct?yy_buffer_state?*YY_BUFFER_STATE;
extern?int?yyleng;
extern?FILE?*yyin?*yyout;
#define?EOB_ACT_CONTINUE_SCAN?0
#define?EOB_ACT_END_OF_FILE?1
#define?EOB_ACT_LAST_MATCH?2
/*?The?funky?do-while?in?the?following?#define?is?used?to?turn?the?definition
?*?int?a?single?C?statement?(which?needs?a?semi-colon?terminator).??This
?*?avoids?problems?with?code?like:
?*
?*? if?(?condition_holds?)
?* yyless(?5?);
?* else
?* do_something_else();
?*
?*?Prior?to?using?the?do-while?the?compiler?would?get?upset?at?the
?*?“else“?because?it?interpreted?the?“if“?statement?as?being?all
?*?done?when?it?reached?the?‘;‘?after?the?yyless()?call.
?*/
/*?Return?all?but?the?first?‘n‘?matched?characters?back?to?the?input?stream.?*/
#defin
?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件??????41076??2014-01-25?17:46??calculator\lex.yy.c
?????文件????????722??2014-01-25?17:07??calculator\test.l
?????文件??????53852??2014-01-25?17:46??calculator\test.tab.c
?????文件???????2544??2014-01-25?17:46??calculator\test.tab.h
?????文件???????3967??2014-01-25?17:46??calculator\test.y
?????目錄??????????0??2014-01-25?18:29??calculator
-----------?---------??----------?-----??----
???????????????102161????????????????????6
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