%{
#include"ex3a.tab.h"
%}
%%
"="{printf("\nOperatorisEQUAL");}
"+"{printf("\nOperatorisPLUS");}"-"{printf("\nOperatorisMINUS");}
"/"{printf("\nOperatorisDIVISION");}
""{printf("\nOperatorisMULTIPLICATION");}
[a-zA-Z][0-9]*{printf("\nIdentifieris%s",yytext);returnID;}
.returnyytext[0];
\nreturn0;
%%
intyywrap()
{
return1;
}
YACCPART:ex3a.y
%{
#include<stdio.h>
%}
%tokenA
%tokenID

%%
statement:A'='E
|E{
printf("\nValidarithmeticexpression");

=$1;
};E:E'+'ID
|E'-'ID
|E''ID
|E'/'ID
|ID
;
%%
externFILEyyin;main()
{
do
{
yyparse();
}while(!feof(yyin));
}
yyerror(char*s)
{
}

Standard output is empty

ERROR: /home/CTDG7p/prog:1:
	Arguments are not sufficiently instantiated
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: No previous search
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Can't ignore goal at this port
ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ?    Call: (3) program ? ERROR: Unknown option (h for help)
   Call: (3) program ? ERROR: Unknown option (h for help)
   Call: (3) program ? ERROR: Unknown option (h for help)
   Call: (3) program ? ERROR: Unknown option (h for help)
   Call: (3) program ? ERROR: Unknown option (h for help)
   Call: (3) program ? ERROR: Unknown option (h for help)
   Call: (3) program ? ERROR: Unknown option (h for help)
   Call: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ?    Exception: (3) program ? ERROR: '$runtoplevel'/0: Undefined procedure: program/0
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ? ERROR: Unknown option (h for help)
   Exception: (3) program ?