编译原理_实验报告(4)

编译原理实验

#include<iostream.h>

#include<stdio.h>

#include<stdlib.h>

#include<string.h>

int i,j,k,flag,number,status;

/*status which is use to judge the string is keywords or not!*/

char ch;

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:{

flag = 4; status = 1; break;

}

case 4:{

flag = 5;

status = 1;

break;

}

case 5:{

flag = 6;

status = 1;

break;

}

case 6:{

flag = 7;

status = 1;

break;

}

case 7:{

flag = 8;

status = 1;

break;

}

case 8:{

flag = 9;

status = 1;

break;

}

4

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