实验一词法分析器的设计(2)

char words[10] = {" "};

char program[500];

int Scan(char program[])

{

char *keywords[13] = {"void","main","if","then","break","int", "char","float","include","for","while","printf",

"scanf"};

number = 0;

status = 0;

j = 0;

ch = program[i++];

/* To handle the lettle space ands tab*/

/*handle letters*/

if ((ch >= 'a') && (ch <= 'z' ))

{

while ((ch >= 'a') && (ch <= 'z' ))

{

words[j++]=ch;

ch=program[i++];

}

i--;

words[j++] = '\0';

for (k = 0; k < 13; k++)

if (strcmp (words,keywords[k]) == 0)

switch(k)

{

case 0:{

flag = 1;

status = 1;

break;

}

case 1:{

flag = 2;

status = 1;

break;

}

case 2:{

flag = 3;

status = 1;

break;

}

case 3:{