詞法分析器的設(shè)計(jì)與實(shí)現(xiàn)

1、1目錄一設(shè)計(jì)題目.................................................................................................................................2二設(shè)計(jì)要求.............................................................................

2、....................................................21.詞法分析器的定義............................................................................................................22.設(shè)計(jì)要求..........................................

3、..................................................................................23.本程序自行規(guī)定：............................................................................................................3三設(shè)計(jì)作用與目的..........

4、...........................................................................................................41.設(shè)計(jì)作用..........................................................................................................

5、...................42.設(shè)計(jì)目的.............................................................................................................................4四運(yùn)行環(huán)境及工具軟件..........................................................

6、...................................................4五系統(tǒng)設(shè)計(jì).................................................................................................................................51.系統(tǒng)總體設(shè)計(jì).........................

7、............................................................................................5（1）詞法分析器的設(shè)計(jì).................................................................................................5（2）總體設(shè)計(jì)框圖.........

8、................................................................................................6（3）總程序流程圖.......................................................................................................62.各子模塊設(shè)計(jì)..

9、...................................................................................................................8（1）字符的識別................................................................................................

10、...........8（2）關(guān)鍵字的識別.........................................................................................................8（3）數(shù)字的識別.....................................................................................

11、......................8（4）界符的識別...........................................................................................................10（5）運(yùn)算處理.........................................................................

12、....................................103.相關(guān)函數(shù)分析.....................................................................................................................114.源程序設(shè)計(jì)................................................

13、.......................................................................12六實(shí)驗(yàn)調(diào)試結(jié)果.......................................................................................................................291.調(diào)試工具.............

14、..............................................................................................................292.調(diào)試步驟......................................................................................................

15、.....................293.調(diào)試結(jié)果...........................................................................................................................29七設(shè)計(jì)中的問題及解決方法......................................................

16、.............................................31八設(shè)計(jì)心得...............................................................................................................................32九參考文獻(xiàn)..................................

17、.............................................................................................343(1)若讀出的是操作數(shù)，則將該操作數(shù)壓入操作數(shù)棧，并依次讀入下一個(gè)符號。(2)若讀出的是運(yùn)算符，則作進(jìn)一步判斷。①若讀出運(yùn)算符的優(yōu)先級大于運(yùn)算符棧頂運(yùn)算符的優(yōu)先級，則將讀出的運(yùn)算符壓入運(yùn)算符棧，并依次讀下一個(gè)符號。②若讀出的是表達(dá)式結(jié)束符“#”，且

18、運(yùn)算符棧棧頂?shù)倪\(yùn)算符也是表達(dá)式結(jié)束符“#”，則表達(dá)式處理結(jié)束，最后的計(jì)算結(jié)果在操作數(shù)棧的棧頂位置。③若讀出運(yùn)算符的優(yōu)先級不大于運(yùn)算符棧棧頂運(yùn)算任的優(yōu)先級，則從操作數(shù)棧連續(xù)退出兩個(gè)操作數(shù)，并從運(yùn)算符棧退出一個(gè)運(yùn)算符，然后作相應(yīng)的運(yùn)算（運(yùn)算符為剛從運(yùn)算符棧退出的運(yùn)算符，運(yùn)算對象為剛從操作數(shù)棧退出的兩個(gè)操作數(shù)），并將運(yùn)算結(jié)果壓入操作棧。3.3.本程序自行規(guī)定：本程序自行規(guī)定：⑴關(guān)鍵字：“auto“，“break“，“case“，““，“con

19、st“，“continue“，“default“，“do“，“double“，“else“，“enum“，“extern“，“float“，“f“，“goto“，“if“，“int“，“l(fā)ong“，“return“，“sht“，“signed“，“sizeof“，“static“，“struct“，“switch“……⑵運(yùn)算符：““，““，““，““，“=“……⑶界符：““，““，“[“，“]“，““，““，“.“，“(“，“)“，“: