can someone help me how can I translate this into infix.y and postfix.y. %{ #include "zcalc.h" #include <string.h> #include <math.h> #include <stdlib.h> #include <stdio.h> /************************************************************************ * * Author: Zachary E Ruiz (ruiz@capsl.udel.edu) (Original) * Aaron Landwehr (aron@udel.edu) (Modification) * Computer Architecture and Parallel Systems Laboratory * (http://www.capsl.udel.edu) - University of Delaware * * Purpose: Actions for a simple prefix calculator... * ************************************************************************/ int flag = 0; void yyerror( char *mesg ); /* yacc error checker */ %} %union { double dval; struct symtab *symp; } %token <symp> NAME %token <dval> NUMBER %left '-' '+' %left '*' '/' %type <dval> expression %% statement_list: statement 'n' | statement_list statement 'n' statement: NAME '=' expression { $1->value = $3; } | expression { printf("= %gn", $1); } expression: '+' expression expression { $$ = $2 + $3; } | '-' expression expression { $$ = $2 - $3; } | '*' expression expression { $$ = $2 * $3; } | '/' expression expression { $$ = $2 / $3; } | '(' expression ')' { $$ = $2; } | NUMBER | NAME { $$ = $1->value; } %% struct symtab * symlook( char *s ) { char *p; struct symtab *sp; for(sp = symtab; sp < &symtab[NSYMS]; sp++) { /* is it already here? */ if (sp->name && !strcmp(sp->name, s)) return sp; /* is it free */ if (!sp->name) { sp->name = strdup(s); return sp; } /* otherwise continue to the next */ } yyerror("Too many symbols...n"); exit(1); } void addfunc( char *name, double (*func)() ) { struct symtab *sp = symlook(name); sp->funcptr = func; } /* yacc error function */ void yyerror( char *mesg ) { flag = 1; printf("%s n" , mesg); } int main() { yyparse(); return 0; }.

1. can someone help me how can I translate this into infix.y and postfix.y.
%{
#include "zcalc.h"
#include <string.h>
#include <math.h>
#include <stdlib.h>
#include <stdio.h>
/************************************************************************
*
* Author: Zachary E Ruiz (ruiz@capsl.udel.edu) (Original)
* Aaron Landwehr (aron@udel.edu) (Modification)
* Computer Architecture and Parallel Systems Laboratory
* (http://www.capsl.udel.edu) - University of Delaware
*
* Purpose: Actions for a simple prefix calculator...
*
************************************************************************/
int flag = 0;
void yyerror( char *mesg ); /* yacc error checker */
%}
%union {
double dval;
struct symtab *symp;
}
%token <symp> NAME
%token <dval> NUMBER
%left '-' '+'
%left '*' '/'
%type <dval> expression
%%
statement_list: statement 'n'
| statement_list statement 'n'
statement: NAME '=' expression { $1->value = $3; }
| expression { printf("= %gn", $1); }
expression: '+' expression expression { $$ = $2 + $3; }
| '-' expression expression { $$ = $2 - $3; }
| '*' expression expression { $$ = $2 * $3; }
| '/' expression expression { $$ = $2 / $3; }
| '(' expression ')' { $$ = $2; }
| NUMBER

2. | NAME { $$ = $1->value; }
%%
struct symtab * symlook( char *s ) {
char *p;
struct symtab *sp;
for(sp = symtab; sp < &symtab[NSYMS]; sp++) {
/* is it already here? */
if (sp->name && !strcmp(sp->name, s))
return sp;
/* is it free */
if (!sp->name) {
sp->name = strdup(s);
return sp;
}
/* otherwise continue to the next */
}
yyerror("Too many symbols...n");
exit(1);
}
void addfunc( char *name, double (*func)() ) {
struct symtab *sp = symlook(name);
sp->funcptr = func;
}
/* yacc error function */
void yyerror( char *mesg ) {
flag = 1;
printf("%s n" , mesg);
}
int main() {
yyparse();
return 0;
}