实验一词法分析器的设计(4)

flag = 13;

status = 1;

break;

}

}

if (status == 0)

{

flag = 100;

}

}

/*handle digits*/

else if ((ch >= '0') && (ch <= '9')) {

number = 0;

while ((ch >= '0' ) && (ch <= '9' )) {

number = number*10+(ch-'0');

ch = program[i++];

}

flag = 200;

i--;

}

/*opereation and edge handle*/

else switch (ch)

{

case '=':{

if (ch == '=')

words[j++] = ch;

words[j] = '\0';

ch = program[i++]; if (ch == '=')

{

words[j++] = ch;

words[j] = '\0';

flag = 401;

}

else

{

i--;

flag = 402;

}

break;

}