%{
#include?
#include?
#include?
#include?
%}
%token?IDENTIFIER?NUM?CONST?VAR?PROCEDURE?B?END?ODD?IF?THEN?CALL?WHILE?DO?READ?WRITE?EQ?BE?SE
%left?‘+‘?‘-‘
%left?‘*‘?‘/‘
%%
program:part_program?‘.‘?{printf（“program?->?part_program\n“）;}
;

part_program:constant_illstruction?var_instruction?process_instruction?statment{printf（“part_program?->?constant_illstruction+var_instruction+process_instruction\n“）;}
		??|constant_illstruction?var_instruction?statment{printf（“part_program?->?constant_illstruction+var_instruction\n“）;}
		??|constant_illstruction?statment{printf（“part_program?->?constant_illstruction\n“）;}
		??|constant_illstruction?process_instruction?statment{printf（“part_program?->?constant_illstruction+process_instruction\n“）;}
		??|var_instruction?process_instruction?statment{printf（“part_program?->?var_instruction+process_instruction\n“）;}
		??|var_instruction?statment{printf（“part_program?->?var_instruction\n“）;}
		??|process_instruction?statment{printf（“part_program?->?process_instruction\n“）;}
		??|statment{printf（“part_program?->?statment\n“）;}
		??;

constant_illstruction:?CONST?const_define?‘;‘?{printf（“constant_illstruction?->?const_define\n“）;}
		???|constant_illstruction?‘‘?const_define{printf（“constant_illstruction?->?constant_illstruction\n“）;}
		???;
const_define:IDENTIFIER?‘=‘?NUM?{printf（“const_define?->?IDENTIFIER\n“）;}
;
var_instruction:VAR?var_mid?‘;‘{printf（“var_instruction?->?IDENTIFIER\n“）;}
	??????;
var_mid:IDENTIFIER{printf（“var_mid?->?IDENTIFIER\n“）;}
	|IDENTIFIER?‘‘?var_mid{printf（“var_mid?->?var_mid?\n“）;}
	;
process_instruction:process_head?part_program?‘;‘{printf（“process_instruction?->?process_head\n“）;}
		???|process_head?part_program?‘;‘?process_instruction?‘;‘?{printf（“process_instruction?->?process_head?+?process_instruction“）;}
		???;?
process_head:PROCEDURE?IDENTIFIER?‘;‘{printf（“process_head?->?PROCEDURE\n“）;}
;
statment:assignment?{printf（“statment?->?assignment\n“）;}
	?|condition??{printf（“statment?->?condition\n“）;}
	?|circle?{printf（“statment?->?circle\n“）;}
	?|process_transfer?{printf（“statment?->?process_transfer\n“）;}
	?|read_statment?{printf（“statment?->?read_statment\n“）;}
	?|write_statment?{printf（“