#include<stdio.h>

#include<stdlib.h>

#include<string.h>

#include "y.tab.h"

#include "task1.h"

#define num_node 1

#define var_node 2

int n;

char *str;

num [0-9]+

asgg [a-z][ \t]*[=]

"begin" {return START;}

"end" {return END;}

"read" {return READ;}

"write" {return WRITE;}

[a-z] { str = strdup(yytext); yylval.node = createTree(0,var_node,str,(tnode*)NULL,(tnode*)NULL); return ID; }

{num} {n = atoi(yytext); yylval.node = createTree(n,num_node,(char*)NULL,(tnode*)NULL,(tnode*)NULL); return NUM;}

{asgg} {str = (char*)malloc(2 * sizeof(char)); str[0]= *yytext; str[1] = '\0'; yylval.node = createTree(0,var_node,str,(tnode*)NULL,(tnode*)NULL); return ASSIGN;}

"+" {return PLUS;}

"-" {return MINUS;}

"*" {return MUL;}

"/" {return DIV;}

"=" {return ASSIGN;}

[();] {return *yytext;}

[\n] {}

[\t] {}

. {}

int yywrap()

{

return 1;

}