实验一：词法分析程序编制实验指导书.docx

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1、编译原理课程实验报告(Experiments for Compiler Principle )北京工业大学软件学院二零一四年七月)else if (ch =二；)cout，zSEMI;z/endl;)else if (isalpha(ch)(bufa=ch;a+;ch=getchar ();while (isalpha(ch)| |isdigit (ch)(bufa = ch;a+;ch = getchar ();)ungetc (ch, stdin);bufa = 0;if(strcmp(buf, if)= 0 |strcmp(buf, then) = 0 |strcmp(buf,else)

2、 = 0 | | strcmp(buf, while) = 0 | strcmp(buf, do)= 0 | strcmp (buf, zzbegin/，) = 0 | |strcmp(buf, z，end，z) =0)(Key (buf);)else(Idn (buf);)else if(sl9(ch)(int n;bufa=ch;a+;ch二getchar ();while(s09 (ch)(bufa=ch;a+;ch二getchar ();)bufa = 0;ungetc (ch,stdin);n=atoi(buf);cout，INT10/zn= 0， & ch/，nendl;Oz，en

3、dl;/zn= a & ch = O & ch二9) | | (ch = a & ch 0x3f 00 while正确结果：这些单词的单词种别及其属性INT100INT1092+_IDNdata_INTI 663INT8 WHILE七、实现代码/ 1. cpp/:定义控制台应用程序的入口点。ttinclude stdafx. h Sinclude stdlib. h include string” iiinclude using namespace std;define IDN 1#define ASG 2 ttdefine KEY 3 ttdefine ERROR -1 int scan()

4、;void Key (char buf);int isOf (char ch);int s09 (char ch);int sl9(char ch);int s07(char ch);int s89 (char ch);void Idn(char buf );void zhuanhuan(char *buf);int _tmain(int argc, TCHAR* argv)int a;while (1)(a=scan ();if (a = 0)(break;)if (a = ERROR)(cout，zInput error，= 1 & ch二9) (return 1;)else(return

5、 0;)int s09 (char ch)(if (ch = O & ch = O & ch = 8 & ch = 9)return 1;elsereturn 0;void zhuanhuan(char *buf) (int i, t;long sum=0;for (i=2;bufi;i+)if (buf i =，9)(t=bufi- 0,;elset=bufi-，a +10;sum=sum*16+t;cout/zINT16cout/zINT16，zsum)(cout/zBT)else if (ch =)(cout，zLTelse if (ch =)(coutz，EQ)else if (ch =()(cout，zLP)else if (ch =)(cout/zRP| | ch =，*，| | ch = | | ch =| | ch = ( | | ch = ) | | ch =;)+，endl;-，endl;*endl;/z，endl;z/endl;=，endl;(z，endl;)endl;