#include "stack.h"
#include<string.h>
const int maxsize=500;//输入程序的总容量
const int retainsize=30;//最大单词的长度
void main()
{
stack sretain,snum,sidentier,sresult;
char input[maxsize],word[retainsize];
int num=0,flag,quanlity;
cout<<"请输入基本字的个数!"<<endl;
cin>>quanlity;
for(int j=0;j<quanlity;j++)
{
cout<<"第"<<j+1<<"个基本字: ";
cin>>word;
if(sretain.compare(word,strlen(word))==-1)
sretain.pushretain(word,strlen(word));
}
cout<<"请输入程序段,以'!'结束!"<<endl;
cin.unsetf(ios::skipws);
cin>>input[num];
while(input[num]!='!'&&num<maxsize)
{
num++;
cin>>input[num];
}
for(int i=0;i<num;)
{
flag=0;
if(input[i]=='+'||input[i]=='='||input[i]==','||input[i]=='('||input[i]==')')
{
word[flag]=input[i];
flag++;
int temp=sretain.compare(word,flag);
if(temp==-1)
temp=sretain.pushretain(word,flag);
sresult.push(word,flag,temp,-1);
i++;
}
else
if(input[i]>='0'&&input[i]<='9')
{
word[flag]=input[i];
flag++;
i++;
while(input[i]>='0'&&input[i]<='9')
{
word[flag]=input[i];
flag++;
i++;
}
int temp=snum.compare(word,flag);
if(temp==-1)
temp=snum.pushnum(word,flag);
sresult.push(word,flag,7,temp);
}
else
if(input[i]>='A'&&input[i]<='Z'||input[i]>='a'&&input[i]<='z')
{
word[flag]=input[i];
flag++;
i++;
while(input[i]>='A'&&input[i]<='Z'||input[i]>='a'&&input[i]<='z'||input[i]>='0'&&input[i]<='9')
{
word[flag]=input[i];
flag++;
i++;
}
int temp=sretain.compare(word,flag);
if(temp!=-1)
sresult.push(word,flag,temp,-1);
else
{
temp=sidentier.compare(word,flag);
if(temp==-1)
temp=sidentier.pushvar(word,flag,0);
sresult.push(word,flag,6,temp);
}
}
else
if(input[i]=='*')
{
word[flag]=input[i];
flag++;
i++;
if(input[i]=='*')
{
word[flag]=input[i];
flag++;
i++;
}
int temp=sretain.compare(word,flag);
if(temp==-1)
temp=sretain.pushretain(word,flag);
sresult.push(word,flag,temp,-1);
}
else
if(input[i]=='#'||input[i]=='@')//定义非法字符
{
word[flag]=input[i];
flag++;
i++;
sresult.pushvar(word,flag,1);
}
else
i++;
}
cout<<"下面是你输入的基本字:"<<endl;
sretain.show(0);
cout<<endl;
cout<<"下面是标志符:"<<endl;
sidentier.show(0);
cout<<endl;
cout<<"下面是常数:"<<endl;
snum.show(0);
cout<<endl;
cout<<"下面是你输入对应的结果:"<<endl;
for(i=0;i<num;i++)
cout<<input[i];
cout<<endl;
sresult.show(1);
cout<<endl;
cin>>i;
}
.rar （14个子文件） 
词法分析器 
词法分析器.opt 48KB 词法分析器.dsp 4KB stack.h 3KB Debug vc60.pdb 60KB 词法分析器.pdb 417KB vc60.idb 41KB 词法分析器.obj 20KB
词法分析器.exe 212KB 词法分析器.ilk 243KB 词法分析器.pch 252KB 词法分析器.plg 901B 词法分析器.cpp 3KB 词法分析器.ncb 33KB 词法分析器.dsw 545B
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