0916编译原理第二次作业

#include<stdio.h>
#include<string.h>
#define max 100
int n=0,i=0;
char token[max];
char a;
char word[max];

void fuhao();
void shuzi();

main()
{
char *rwtab[6]={"begin","if","then","while","do","end"};
int p=0,j=0,k=0,m=0;
int key=0;
printf("请输入源程序（以#键结束）：");
do{
scanf("%c",&a);
word[p]=a;
p++;
}while(a!='#');

//关键字的判断

while(word[i]!='#')
{
while((word[i]>='a'&&word[i]<='z')||(word[i]>='A'&&word[i]<='Z'))
{
if((word[i]>='a'&&word[i]<='z')||(word[i]>='A'&&word[i]<='Z'))
{
token
=word[i];
n++;
token
='\0';
i++;
}

for(k=0;k<6;k++)
{
key=0;
if(strcmp(rwtab[k],token)==0)
{
printf("%s   %d\n",rwtab[k],k+1);
key=1;
break;
}
}    }
if(key==0)
{
printf("%s   10\n",token);
}
key=1;
i=i+1;
n=0;
}
fuhao();
shuzi();
}
//特殊符号的判断
void fuhao()
{
int p=0,sign=0;
for(p=0;p<max;p++)
{
switch(word[p])
{
case '+':
printf("+    13\n");
break;
case '-':
printf("-    14\n");
break;
case '*':
printf("*    15\n");
break;
case '/':
printf("/    16\n");
break;
case ':':
if(word[p+1]=='=')
{
printf(":=   18\n");
p++;
}
else
printf(":    17\n");
break;
case '<':
if(word[p+1]=='=')
{
printf("<=     21\n");
sign=1;
p++;
}
else if(word[p+1]=='>')
{
printf("<>     22\n");
sign=1;
p++;
}
else if(sign==0)
printf("<    20\n");
break;
case '>':
if(word[p+1]=='=')
{
printf(">=    24\n");
p++;
}
else
printf(">    23\n");
break;
case '=':
printf("=    25\n");
break;
case ';':
printf(";    26\n");
break;
case '(':
printf("(    27\n");
break;
case ')':
printf(")    28\n");
break;
case '#':
printf("#    29\n");
break;
}
}
}
//数字的判断
void shuzi()
{
int p=0,j=0,t=0,key=0;
char Shu[100];
while(word[p]!='#')
{
key=0;
while(word[p]>='0'&&word[p]<='9')
{
Shu[j]=word[p];
p++;
j++;
key=1;
}
if(key==1)
{
for(t=0;t<j;t++)
{
printf("%c",Shu[t]);
}
printf("    11\n");
j=0;
}
p++;
}

}