ch3-01.y

来自「編譯器的虛擬yacc工具」· Y 代码 · 共 15 行

%token NAME NUMBER EOLN

%%
statement:	NAME '=' expression EOLN
	|	expression EOLN		{ printf("= %d\n", $1); }
	;

expression:	expression '+' NUMBER	{ $$ = $1 + $3; }
	|	expression '-' NUMBER	{ $$ = $1 - $3; }
	|	NUMBER			{ $$ = $1; }
	;

%%