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In function `yyparse':
y.tab.c:(.text+0x3f8): undefined reference to `yylex'
/tmp/cc2SiGTP.o: In function `main':
y.tab.c:(.text+0x372e): undefined reference to `yyin'
y.tab.c:(.text+0x373a): undefined reference to `yyin'
collect2: error: ld returned 1 exit status

%{
#include <stdio.h>
#include <string.h>
#include<conio.h>
#include<string.h>
#include "yaccWithSemanticAnd3AD.tab.h"
char c;
void removeComment();
void removeWhiteSpace();
DIGIT  [0-9]+
NUMBER [+-]?[0-9]+|[+-]?[0-9]*"."[0-9]+
STRING \"(\\.|[^\"])*\"
BOOLEAN ["True" "False"]
ID [a-zA-Z_][0-9a-zA-Z_]*
FLOAT [0-9]+[.][0-9]*
ARITHMETIC_OPERATORS ['+' '-' '*' '/' '%']
OTHER_CHARACTERS ['=' '.' '(' ')' '{' '}' '[' ']']
TYPES ["Number" "String" "Boolean" "Return"]
[ \t] ;
[\n] ;
"If"    { return (IF); }
"Else"  { return (ELSE); }
"While" { return (WHILE); }
"Main()" {return (MAIN); }
"Read()" {return (READ);}
"Class"  {return (CLASS);}
"True"   {return (TRUE);}
"False"  {return (FALSE);}
"Number" {return (TYPES);}
"String" {return (TYPES);}
"Boolean" {return (TYPES);}
"Print"   {return (PRINT);}
"Return"  {return (TYPES);}
"<!"      { removeComment();}
">" {yylval.sval = strdup(yytext);
        return (REL_OPT);}
"<" {yylval.sval = strdup(yytext);
        return (REL_OPT);}
">="    {yylval.sval = strdup(yytext);
        return (REL_OPT);}
"<="    {yylval.sval = strdup(yytext);
        return (REL_OPT);}
"!="    {yylval.sval = strdup(yytext);
        return (REL_OPT);}
"=="    {yylval.sval = strdup(yytext);
        return (REL_OPT);}
"|" {yylval.sval = strdup(yytext);
        return (OR);}
"&" {yylval.sval = strdup(yytext);
        return (AND);}
"!" {yylval.sval = strdup(yytext);
        return (NOT);}
{NUMBER}  { yylval.nval = atof(yytext);
       return NUMBER; }
{BOOLEAN}  { yylval.fval = atof(yytext);
       return BOOLEAN; }
{STRING}  { yylval.fval = atof(yytext);
       return STRING; }
{ID} {
        yylval.sval = strdup(yytext);
        return ID; 
{ARITHMETIC_OPERATORS}   {
                c = yytext[0];
                 return(c);
{OTHER_CHARACTERS}   {
                 c = yytext[0];
                 return(c);
void removeComment()
    register int c;
    while(1)
        while((c=input())!='!' && c!=EOF);
            if(c==EOF)
                exit(1);
        if(c==EOF)
            exit(1);
        if((c=input())=='<')
        break;
        unput(c);
    removeWhiteSpace();
void removeWhiteSpace()
    c=input();
    while(c==' '||c=='\t'||c=='\n')
        c=input();
    unput(c);
}

%{
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
char *s1, *s2;
char *b1, *b2;
struct exprType{
    char *addr;
    char *code;
int n=1;
int nl = 1;
char *var;
char num_to_concatinate[10];
char num_to_concatinate_l[10];
char *ret;
char *temp;
char *label;
char *label2;
char *check;
char *begin;
struct exprType *to_return_expr;
char * newTemp(){
    char *newTemp = (char *)malloc(20);
    strcpy(newTemp,"t");
    snprintf(num_to_concatinate, 10,"%d",n);
    strcat(newTemp,num_to_concatinate);
    return newTemp;
char * newLabel(){
    char *newLabel = (char *)malloc(20);
    strcpy(newLabel,"L");
    snprintf(num_to_concatinate_l, 10,"%d",nl);
    strcat(newLabel,num_to_concatinate_l);
    nl++;
    return newLabel;
%start startSym
%union {
    float nval;
    char *sval;
    struct exprType *EXPRTYPE;
%token <nval> NUMBER
%token <sval> BOOLEAN
%token <sval> STRING
%token <sval> READ
%token <sval> PRINT
%token <sval> ID IF ELSE WHILE TYPES REL_OPT OR AND NOT MAIN CLASS TRUE FALSE
%token <sval> '+' '-' '*' '/'  '%' '\n' '=' '.'
%type <sval> list text construct block dec bool program startSym
%type <EXPRTYPE> expr stat
%left OR
%left AND
%left NOT
%left REL_OPT
%right '='
%left '+' '-'
%left '*' '/' '%'
startSym:   program 
                s1 = $1;
                label = newLabel();
                check = strstr(s1, "NEXT");
                while(check != NULL) {
                    strncpy(check, label, strlen(label));
                    strncpy(check + strlen(label),"    ", (4 - strlen(label)));
                    check = strstr(s1, "NEXT");
                ret = (char*) malloc(strlen(s1) + 10);
                ret[0] = 0;
                strcat(ret, s1);
                strcat(ret, "\n");
                strcat(ret, label);
                strcat(ret, "3AD ends here\n");
                printf("\nIntermediate code:\n");
                puts(ret);
                $$ = ret;
program :   program construct 
            s1 = $1;
            s2 = $2;
            label = newLabel();
            check = strstr(s1, "NEXT");
            while(check != NULL) {
                strncpy(check, label, strlen(label));
                strncpy(check + strlen(label), "    ", (4 - strlen(label)));
                check = strstr(s1, "NEXT");
            ret = (char*) malloc(strlen($1) + strlen($2) + 4);
            ret[0] = 0;
            strcat(ret, $1);
            strcat(ret, "\n");
            strcat(ret, label);
            strcat(ret, " : ");
            strcat(ret, $2);
            printf("Program construct\n");
            puts(ret);
            $$ = ret;
        construct
            printf("Final construct \n");
            puts($1);
            $$ = $1;
            printf("Final list \n");
            puts($1);
            $$ = $1;
construct :     block
            $$ = $1;
        WHILE '(' bool ')' block
            printf("Inside WHILE\n");
            puts($5);
            b1 = $3;
            s1 = $5;
            begin = newLabel();
            label = newLabel();
            check = strstr(b1, "TRUE");
            while(check!=NULL){
                strncpy (check,label,strlen(label));
                strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"TRUE");
            check = strstr (b1,"FAIL");
            while(check!=NULL){
                strncpy (check,"NEXT",4);
                //strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"FAIL");
            check = strstr (s1,"NEXT");
            while(check!=NULL){
                strncpy (check,begin,strlen(begin));
                strncpy (check+strlen(begin),"    ",(4-strlen(begin)));
                check = strstr (s1,"NEXT");
            ret = (char *)malloc(strlen(b1)+strlen(s1)+20);
            ret[0] = 0;
            strcat(ret,begin);
            strcat(ret," : ");
            strcat(ret,b1);
            strcat(ret,"\n");
            strcat(ret,label);
            strcat(ret," : ");
            strcat(ret,s1);
            strcat(ret,"\n");
            strcat(ret,"goto ");
            strcat(ret,begin);
            printf("Final return from while\n");
            puts(ret);
            $$ = ret;
        IF '(' bool ')' block
            printf("Inside IF\n");
            label = newLabel();
            b1 = $3;
            check = strstr (b1,"TRUE");
            while(check!=NULL){
                strncpy (check,label,strlen(label));
                strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"TRUE");
            check = strstr (b1,"FAIL");
            while(check!=NULL){
                strncpy (check,"NEXT",4);
                //strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"FAIL");
            ret = (char *)malloc(strlen(b1)+strlen($5)+4);
            ret[0] = 0;
            strcat(ret,b1);
            strcat(ret,"\n");
            strcat(ret,label);
            strcat(ret," : ");
            strcat(ret,$5);
            puts(ret);
            $$ = ret;
        IF '(' bool ')' block ELSE block
            printf("Inside IF then ELSE\n");
            b1 = $3;
            label = newLabel();
            check = strstr (b1,"TRUE");
            while(check!=NULL){
                strncpy (check,label,strlen(label));
                strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"TRUE");
            label2 = newLabel();
            check = strstr (b1,"FAIL");
            while(check!=NULL){
                strncpy (check,label2,strlen(label2));
                strncpy (check+strlen(label2),"    ",(4-strlen(label2)));
                check = strstr (b1,"FAIL");
            ret = (char *)malloc(strlen(b1)+strlen($5)+strlen($7)+20);
            ret[0] = 0;
            strcat(ret,b1);
            strcat(ret,"\n");
            strcat(ret,label);
            strcat(ret," : ");
            strcat(ret,$5);
            strcat(ret,"\n");
            strcat(ret,"goto NEXT");
            strcat(ret,"\n");
            strcat(ret,label2);
            strcat(ret," : ");
            strcat(ret,$7);
            puts(ret);
            $$ = ret;
        CLASS ID block
               s1 = $3;
block:  '{' list '}'
                printf("Inside class block\n");
                $$ = $2;
        '{' construct '}'
                $$ = $2;
        '[' list ']'
                printf("Inside specific block\n");
                $$ = $2;
        '[' construct ']'
                $$ = $2;
list:    stat               
            $$ = $1->code;
        list stat
            ret = (char*) malloc(strlen($1) + strlen($2->code) + 4);
            ret[0] = 0;
            strcat(ret, $1);
            strcat(ret, "\n");
            strcat(ret, $2->code);
            printf("Inside list stat \n");
            puts(ret);
            $$ = ret;
        list error '\n'
            yyerrok;
        MAIN block
            s1 = $2;
stat:    '.'
          to_return_expr = (struct exprType*) malloc(sizeof(exprType));
          to_return_expr->addr = (char *) malloc(20);
          to_return_expr->addr = $1;
          to_return_expr->code = (char*) malloc(2);
          to_return_expr->code[0] = 0;
          $$ = to_return_expr; 
        expr '.'
            $$ = $1;
        dec '.'
         to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
        to_return_expr->addr = (char *)malloc(20);
        to_return_expr->addr = $1;
        to_return_expr->code = (char *)malloc(2);
        to_return_expr->code[0] = 0;
        $$ = to_return_expr;   
        text '=' expr '.'
            printf("Assignment statement \n");
            to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
            to_return_expr->addr = (char *)malloc(20);
            to_return_expr->addr = newTemp();
            ret = (char*)malloc(20);
            ret[0] = 0;
            strcat(ret, $1);
            strcat(ret, "=");
            strcat(ret, $3->addr);
            printf("RET = \n");
            puts(ret);
            temp = (char*) malloc(strlen($3->code) + strlen(ret) + 6);
            temp[0] = 0;
            if($3->code[0] != 0) {
                strcat(temp, $3->code);
                strcat(temp, "\n");
            strcat(temp, ret);
            printf("TEMP = \n");
            puts(temp);
            to_return_expr->code = temp;
            $$ = to_return_expr;
        dec '=' expr '.'
        printf("Dec and Assignment statement \n");
        to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
        to_return_expr->addr = (char *)malloc(20);
        to_return_expr->addr = newTemp();
        ret = (char *)malloc(20);
        ret[0] = 0;
        strcat(ret,$1);
        strcat(ret,"=");
        strcat(ret,$3->addr);
        printf("RET  = \n");
        puts(ret);
        temp = (char *)malloc(strlen($1)+strlen($3->code)+strlen(ret)+6);
        temp[0] = 0;
        if ($3->code[0]!=0){
            strcat(temp,$3->code);
            strcat(temp,"\n");
        strcat(temp,ret);
        printf("TEMP = \n");
        puts(temp);
        to_return_expr->code = temp;
            $$ = to_return_expr;
dec :   TYPES text 
            $$ = $2;
bool :  expr REL_OPT expr
            printf("Inside rel opt\n");
            temp = (char *)malloc(strlen($1->code)+strlen($3->code)+50);
            temp[0] = 0;
            if($1->code[0]!=0){
                strcat(temp,$1->code);
                strcat(temp,"\n");
            if($3->code[0]!=0){
                strcat(temp,$3->code);
                strcat(temp,"\n");
            ret = (char *)malloc(50);
            ret[0] = 0;
            strcat(ret,"if(");
            strcat(ret,$1->addr);
            strcat(ret,$2);
            strcat(ret,$3->addr);
            strcat(ret,") goto TRUE \n goto FAIL");
            strcat(temp,ret);
            $$ = temp;
        bool OR bool
            printf("Inside OR\n");
            b1 = $1;
            b2 = $3;
            label = newLabel();
            check = strstr (b1,"FAIL");
            while(check!=NULL){
                strncpy (check,label,strlen(label));
                strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"FAIL");
            temp = (char *)malloc(strlen(b1)+strlen(b2)+10);
            temp[0] = 0;
            strcat(temp,b1);
            strcat(temp,"\n");
            strcat(temp,label);
            strcat(temp," : ");
            strcat(temp,b2);
            $$ = temp;
        bool AND bool
            printf("Inside AND\n");
            b1 = $1;
            b2 = $3;
            label = newLabel();
            check = strstr (b1,"TRUE");
            while(check!=NULL){
                strncpy (check,label,strlen(label));
                strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"TRUE");
            temp = (char *)malloc(strlen(b1)+strlen(b2)+10);
            temp[0] = 0;
            strcat(temp,b1);
            strcat(temp,"\n");
            strcat(temp,label);
            strcat(temp," : ");
            strcat(temp,b2);
            $$ = temp;
        NOT '(' bool ')'
            printf("Inside NOT\n");
            b1 = $3;
            label = "TEFS";
            check = strstr (b1,"TRUE");
            while(check!=NULL){
                strncpy (check,label,strlen(label));
                //strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"TRUE");
            label = "TRUE";
            check = strstr (b1,"FAIL");
            while(check!=NULL){
                strncpy (check,label,strlen(label));
                //strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"FAIL");
            label = "FAIL";
            check = strstr (b1,"TEFS");
            while(check!=NULL){
                strncpy (check,label,strlen(label));
                //strncpy (check+strlen(label),"    ",(4-strlen(label)));
                check = strstr (b1,"TEFS");
            $$ = b1;
        '(' bool ')'
            $$ = $2;
         printf("Inside TRUE\n");
            ret = (char *)malloc(20);
            ret[0] = 0;
            strcat(ret,"\ngoto TRUE");
            $$ = ret;
        FALSE 
             printf("Inside False\n");
            ret = (char *)malloc(20);
            ret[0] = 0;
            strcat(ret,"\ngoto FAIL");
            $$ = ret;
expr:    '(' expr ')'
           $$ = $2;
         expr '*' expr
           printf("Multiplication : ");
           to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
        to_return_expr->addr = (char *)malloc(20);
        to_return_expr->addr = newTemp();
        ret = (char *)malloc(20);
        ret[0] = 0;
        strcat(ret,to_return_expr->addr);
        strcat(ret,"=");
        strcat(ret,$1->addr);
        strcat(ret,"*");
        strcat(ret,$3->addr);
        printf("RET  = \n");
        puts(ret);
        temp = (char *)malloc(strlen($1->code)+strlen($3->code)+strlen(ret)+6);
        temp[0] = 0;
        if ($1->code[0]!=0){
            strcat(temp,$1->code);
            strcat(temp,"\n");
        if ($3->code[0]!=0){
            strcat(temp,$3->code);
            strcat(temp,"\n");
        strcat(temp,ret);
        printf("TEMP = \n");
        puts(temp);
        to_return_expr->code = temp;
        $$ = to_return_expr;
         expr '/' expr
           printf("Division: ");
           to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
        to_return_expr->addr = (char *)malloc(20);
        to_return_expr->addr = newTemp();
        ret = (char *)malloc(20);
        ret[0] = 0;
        strcat(ret,to_return_expr->addr);
        strcat(ret,"=");
        strcat(ret,$1->addr);
        strcat(ret,"/");
        strcat(ret,$3->addr);
        printf("RET  = \n");
        puts(ret);
        temp = (char *)malloc(strlen($1->code)+strlen($3->code)+strlen(ret)+6);
        temp[0] = 0;
        if ($1->code[0]!=0){
            strcat(temp,$1->code);
            strcat(temp,"\n");
        if ($3->code[0]!=0){
            strcat(temp,$3->code);
            strcat(temp,"\n");
        strcat(temp,ret);
        printf("TEMP = \n");
        puts(temp);
        to_return_expr->code = temp;
        $$ = to_return_expr;
         expr '+' expr
           printf("Addition : ");
           to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
        to_return_expr->addr = (char *)malloc(20);
        to_return_expr->addr = newTemp();
        ret = (char *)malloc(20);
        ret[0] = 0;
        strcat(ret,to_return_expr->addr);
        strcat(ret,"=");
        strcat(ret,$1->addr);
        strcat(ret,"+");
        strcat(ret,$3->addr);
        printf("RET  = \n");
        puts(ret);
        temp = (char *)malloc(strlen($1->code)+strlen($3->code)+strlen(ret)+6);
        temp[0] = 0;
        if ($1->code[0]!=0){
            strcat(temp,$1->code);
            strcat(temp,"\n");
        if ($3->code[0]!=0){
            strcat(temp,$3->code);
            strcat(temp,"\n");
        strcat(temp,ret);
        printf("TEMP = \n");
        puts(temp);
        to_return_expr->code = temp;
            $$ = to_return_expr;
         expr '-' expr
           printf("Subtraction : ");
           to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
        to_return_expr->addr = (char *)malloc(20);
        to_return_expr->addr = newTemp();
        ret = (char *)malloc(20);
        ret[0] = 0;
        strcat(ret,to_return_expr->addr);
        strcat(ret,"=");
        strcat(ret,$1->addr);
        strcat(ret,"-");
        strcat(ret,$3->addr);
        printf("RET  = \n");
        puts(ret);
        temp = (char *)malloc(strlen($1->code)+strlen($3->code)+strlen(ret)+6);
        temp[0] = 0;
        if ($1->code[0]!=0){
            strcat(temp,$1->code);
            strcat(temp,"\n");
        if ($3->code[0]!=0){
            strcat(temp,$3->code);
            strcat(temp,"\n");
        strcat(temp,ret);
        printf("TEMP = \n");
        puts(temp);
        to_return_expr->code = temp;
            $$ = to_return_expr;
           printf("Text : ");
           to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
        to_return_expr->addr = (char *)malloc(20);
        to_return_expr->addr = $1;
        to_return_expr->code = (char *)malloc(2);
        to_return_expr->code[0] = 0;
        $$ = to_return_expr;
        BOOLEAN
           printf("Inside BOOLEAN : %d\n",$1);
        var = (char *)malloc(20);
            snprintf(var, 10,"%d",$1);
        $$ = var;
        STRING
           printf("Inside String : ");
          printf("Inside STRING : %s\n",$1);
        var = (char *)malloc(20);
            snprintf(var, 10,"%s",$1);
        $$ = var;
        NUMBER
           printf("Inside Number : \n");
           printf("Inside Number : %f\n", $1);
           var = (char *)malloc(20);
           snprintf(var, 10,"%f",$1);
        $$ = var;
            printf("Inside Read: \n");
            to_return_expr = (struct exprType *)malloc(sizeof(struct exprType));
        to_return_expr->addr = (char *)malloc(20);
        to_return_expr->addr = $1;
        to_return_expr->code = (char *)malloc(2);
        to_return_expr->code[0] = 0;
        $$ = to_return_expr;
text:   ID
           printf("Inside Identifier : ");
           $$ = $1;
extern int yylex();
extern int yyparse();
extern FILE *yyin;
main() {
    // open a file handle to a particular file:
    FILE *myfile = fopen("input.txt", "r");
    // make sure it is valid:
    if (!myfile) {
        printf("I can't open a.snazzle.file!");
        return -1;
    // set lex to read from it instead of defaulting to STDIN:
    yyin = myfile;
    // parse through the input until there is no more:
        yyparse();
    } while (!feof(yyin));
void yyerror(const char *s) {
    printf("EEK, parse error!  Message: ");
    puts(s);

问 未声明的'yylex‘和'yyin’