编译原理——词法分析器

这是个词法分析器的雏形.....嘿嘿

#include <stdio.h>
#include <string.h>
#include <stdlib.h>


typedef struct Lnode
...{
    char data[20];
    struct Lnode *next;
}Lnode,*LinkList;
LinkList symtable,consttable;

void CreateList(LinkList &L)
...{
    L=(LinkList)malloc(sizeof(Lnode));
    L->next=NULL;
}

void ListInsert(LinkList &L,int &number,char *strToken)
...{
    LinkList  p,s;
    p=L;
    number=1;
    while (p->next)
    ...{
        p=p->next;
        number++;
       }
    s=(LinkList)malloc(sizeof(Lnode));
    strcpy(s->data,strToken);
    //s->next=p->next;
    p->next=s;
    s->next=NULL;
    p=s;

}


char *keyword[32]=...{"auto","break","case","char","const","contunue","default","do",
                    "double","else","enum","extern", "float","for","goto","if",
                    "int","long","register","return","short","signed","sizeof","static",
                   "struct","switch","typedef","union","unsigned","void","volatile","while"
                  };
bool IsDigit(char ch)
...{//判断是否为字母
    return(ch>='0'&&ch<='9');
}
bool IsLetter(char ch)
...{//判断是否为数字
    return((ch>='a'&&ch<='z')||(ch>='A'&&ch<='Z'));
}

void GetChar(FILE *fp,char &ch)
...{//将下一输入字符读到ch中
    ch=fgetc(fp);
}
void GetBC(FILE *fp,char &ch)
...{//检查ch中的字符是否为空白,是空白则调用GetChar知道ch不是空白
    while (ch==' '||ch==' '||ch==' ')
        GetChar(fp,ch);
}


int Reserve(char *strToken)
...{//对strToken中的字符串查找保留字
    int i;
    for(i=1;i<=32;i++)
    ...{    
        if(!strcmp(keyword[i-1],strToken))
            return i;
    }
    return 0;
}
void Concat(char *strToken,char ch)
...{//将ch中的字符链接到strToken之后
    int i=0;
    while (strToken[i]!='

}