1. What is the grammar accepted by this interpreter. Write as EBNF form

2.How can the bison program evaluate the input, print out the result

/* calculator #2 */ #include #include "y.tab.h.. void yyerror (char); yylval = *yytext - 'a'; return VARIABLE; yylval return atoi(yytext); INTEGER; )/* return *yytext; It] /*skip whitespace/ yyerror("Unknown character"); int yywrap (void) [ return 1