ch3-03.y		ch3-03.y
	%{		%{
			/* For printf() */
			#include <stdio.h>
			/* Proformas for functions we define below... */
			void yyerror(char *s);
			int yylex(void);
			/* Specific for here... */
	double vbltable[26];		double vbltable[26];
	%}		%}
	%union {		%union {
	double dval;		double dval;
	int vblno;		int vblno;
	}		}
	%token <vblno> NAME		%token <vblno> NAME
	%token <dval> NUMBER		%token <dval> NUMBER
	skipping to change at line 41		skipping to change at line 49
	yyerror("divide by zero");		yyerror("divide by zero");
	else		else
	$$ = $1 / $3;		$$ = $1 / $3;
	}		}
	| '-' expression %prec UMINUS { $$ = -$2; }		| '-' expression %prec UMINUS { $$ = -$2; }
	| '(' expression ')' { $$ = $2; }		| '(' expression ')' { $$ = $2; }
	| NUMBER		| NUMBER
	| NAME { $$ = vbltable[$1]; }		| NAME { $$ = vbltable[$1]; }
	;		;
	%%		%%
			/* An optional but friendlier yyerror function... */
			void yyerror(char *s)
			{
			extern int yylineno; // defined and maintained in lex
			extern char *yytext; // defined and maintained in lex
			fprintf(stderr, "ERROR: %s at symbol '%s' on line %d\n", s, yytext, yylineno);
			}
End of changes. 2 change blocks.
	0 lines changed or deleted		8 lines changed or added
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