#include <stdio.h>
#include <string.h>
#include <iostream.h>
/*全局变量*/
char * chr_form[100];
int q=0,temp;
char *word[6]={"begin","end","if","then","do","while"};
int i=0,j=0,k=0,t=0;
char ch,str[20];
char *ss[100];
char form[1000];
void analyze();
void main ()
{
printf("输入字符串，以*结束：");
form[0]=cin.get();
for(q=1;form[q-1]!='##';q++)
{
form[q]=cin.get();
if(form[q]=='*')
{
printf("你输入是:
");
cout.write(form,q);
break;
}
}
cout<<endl;
analyze();
}
void GetChar()
{
ch=form[k];
k++;
}
void getbc()
{
while(ch==' ')
{
GetChar();
}
}
void concat()
{
str[i]=ch;
i++;
}
bool isletter()
{
if(((ch<='z')&&(ch>='a'))||((ch<='Z')&&(ch>='A')))
return(1);
else
return(0);
}
bool isdigit()
{
if(((ch)<='9')&&((ch)>='0'))
return (1);
else
return (0);
}
int reserve()
{
for(int q=0;q<5;q++)
{
if(strcmp(word[q],str)==0)
return q;
if(q==4)
return -1;
}
}
void retract()
{
k--;
ch=NULL;
}
char *insertld()
{
chr_form[j]=str;
j++;
return chr_form[0];
}
char * insertconst()
{
ss[t]=str;
t++;
return ss[0];
}
int code;
void output(int a,char *p1,char *p2)
{
cout<<" 类别码:"<<a<<" 单词值:";
while(p1<=p2)
{
printf("%s",*p1);
p1++;
}
cout<<endl;
}
void analyze()
{
GetChar();
getbc();
if(isletter())
{
while (isletter()||isdigit())
{
concat();
GetChar();
}
retract();
code=reserve();
switch(code)
{
case 0:cout<<"单词:" <<str<<" 类别码为: "<<1<<endl;break;
case 1:cout<<"单词:" <<str<<" 类别码为: "<<2<<endl;break;
case 2:cout<<"单词:" <<str<<" 类别码为: "<<3<<endl;break;
case 3:cout<<"单词:" <<str<<" 类别码为: "<<4<<endl;break;
case 4:cout<<"单词:" <<str<<" 类别码为: "<<5<<endl;break;
case 5:cout<<"单词:" <<str<<" 类别码为: "<<6<<endl;break;
default:
cout<<"单词:" <<str<<" 类别码为: "<<6<<endl;break;
}
}
else
{
if( isdigit())
{
while(isdigit()||ch=='.')
{
concat();
GetChar();
}
retract();
cout<<"单词:"<<str<<" 类别码为："<<7<<endl;
}
else
{
switch(ch)
{
case'+': printf("+ 类别码为13
");break;
case'-': printf("- 类别码为14
");break;
case'*': printf("* 类别码为15
");break;
case'/': printf("/ 类别码为16
");break;
case';': printf("; 类别码为26
");break;;
case'(': printf("( 类别码为27
");break;
case')': printf(") 类别码为58
");break;
case'#': printf("#类别码为0
");;break;
case':':GetChar();
if(ch=='=')
{
cout<<"单词::= 类别码为: "<<18<<endl;break;
}
else
{
retract();
cout<<"单词:: 类别码为: "<<17<<endl;break;
}
case'=':cout<<"单词:= 类别码:"<<24<<endl; break;
case'>':GetChar();switch(ch)
{
case'=':cout<<"单词:>= 类别码:"<<24<<endl;break;
default: retract;
cout<<"单词:=> 类别码:"<<12<<endl;break;
}
case'<':GetChar();
switch(ch)
{
case'=':cout<<"单词:<= 类别码:"<<21<<endl;break;
case'>':cout<<"单词:<> 类别码:"<<22<<endl;break;
default: retract();
cout<<"单词:< 类别码:"<<20<<endl;break;
}
}
}
}
while(k<q)
{
for(int p=0;p<50;p++)
str[p]=' ';
i=0;
analyze();
}
}