2.tab.c

打开2.tab.c编译运行

#line 19 "2.y"
{printf("<分程序> --> <常量说明部分><变量说明部分><过程说明部分><语句>\n");;
    break;}
case 3:
#line 21 "2.y"
{printf("<分程序> --> <变量说明部分><过程说明部分><语句>\n");;
    break;}
case 4:
#line 23 "2.y"
{printf("<分程序> --> <常量说明部分><过程说明部分><语句>\n");;
    break;}
case 5:
#line 25 "2.y"
{printf("<分程序> --> <常量说明部分><变量说明部分><语句>\n");;
    break;}
case 6:
#line 27 "2.y"
{printf("<分程序> --> <常量说明部分><语句>\n");;
    break;}
case 7:
#line 29 "2.y"
{printf("<分程序> --> <变量说明部分><语句>\n");;
    break;}
case 8:
#line 31 "2.y"
{printf("<分程序> --> <过程说明部分><语句>\n");;
    break;}
case 9:
#line 33 "2.y"
{printf("<分程序> --> <语句>\n");;
    break;}
case 10:
#line 38 "2.y"
{printf("<常量说明部分> --> CONST <常量定义序列>;\n");;
    break;}
case 11:
#line 43 "2.y"
{printf("<常量定义序列> --> <常量定义>\n");;
    break;}
case 12:
#line 45 "2.y"
{printf("<常量定义序列> --> <常量定义序列>,<常量定义>\n");;
    break;}
case 13:
#line 50 "2.y"
{printf("<常量定义> --> <标识符>:=<无符号整数>\n");;
    break;}
case 14:
#line 55 "2.y"
{printf("<变量说明部分> --> VAR <标识符序列>;\n");;
    break;}
case 15:
#line 60 "2.y"
{printf("<标识符序列> --> <标识符>\n");;
    break;}
case 16:
#line 62 "2.y"
{printf("<标识符序列> --> <标识符序列>,<标识符>\n");;
    break;}
case 17:
#line 67 "2.y"
{printf("<过程说明部分>--><过首部><分程序>;<过程说明部分>;");;
    break;}
case 18:
#line 68 "2.y"
{printf("<过程说明部分>--><过程首部><分程序>;\n");;
    break;}
case 19:
#line 73 "2.y"
{printf("<过程首部> --> PROCEDURE<标识符>;\n");;
    break;}
case 20:
#line 78 "2.y"
{printf("<语句> --> <赋值语句>\n");;
    break;}
case 21:
#line 80 "2.y"
{printf("<语句> --> <复合语句>\n");;
    break;}
case 22:
#line 82 "2.y"
{printf("<语句> --> <条件语句>\n");;
    break;}
case 23:
#line 84 "2.y"
{printf("<语句> --> <当型循环语句>\n");;
    break;}
case 24:
#line 86 "2.y"
{printf("<语句> --> <过程调用语句>\n");;
    break;}
case 25:
#line 88 "2.y"
{printf("<语句> --> <读语句>\n");;
    break;}
case 26:
#line 90 "2.y"
{printf("<语句> --> <写语句>\n");;
    break;}
case 27:
#line 92 "2.y"
{printf("<语句> --> <空>\n");;
    break;}
case 28:
#line 97 "2.y"
{printf("<赋值语句> --> <标识符>:=<表达式>\n");;
    break;}
case 29:
#line 102 "2.y"
{printf("<复合语句> --> BEGIN<语句序列>END\n");;
    break;}
case 30:
#line 107 "2.y"
{printf("<语句序列> --> <语句>\n");;
    break;}
case 31:
#line 109 "2.y"
{printf("<语句序列> --> <语句序列>;<语句>\n");;
    break;}
case 32:
#line 114 "2.y"
{printf("<条件> --> <表达式><关系运算符><表达式>\n");;
    break;}
case 33:
#line 116 "2.y"
{printf("<条件> --> ODD<表达式>\n");;
    break;}
case 34:
#line 121 "2.y"
{printf("<条件语句> --> IF<条件>THEN<语句>\n");;
    break;}
case 35:
#line 126 "2.y"
{printf("<表达式> --> +<项序列>\n");;
    break;}
case 36:
#line 128 "2.y"
{printf("<表达式> --> -<项序列>\n");;
    break;}
case 37:
#line 130 "2.y"
{printf("<表达式> --> <项序列>\n");;
    break;}
case 38:
#line 135 "2.y"
{printf("<项序列> --> <项>\n");;
    break;}
case 39:
#line 137 "2.y"
{printf("<项序列> --> <项序列>+<项>\n");;
    break;}
case 40:
#line 139 "2.y"
{printf("<项序列> --> <项序列>-<项>\n");;
    break;}
case 41:
#line 144 "2.y"
{printf("<项> --> <因子序列>\n");;
    break;}
case 42:
#line 149 "2.y"
{printf("<因子序列> --> <因子>\n");;
    break;}
case 43:
#line 151 "2.y"
{printf("<因子序列> --> <因子序列>*<因子>\n");;
    break;}
case 44:
#line 153 "2.y"
{printf("<因子序列> --> <因子序列>/<因子>\n");;
    break;}
case 45:
#line 158 "2.y"
{printf("<因子> --> <标识符>\n");;
    break;}
case 46:
#line 160 "2.y"
{printf("<因子> --> <无符号整数>\n");;
    break;}
case 47:
#line 162 "2.y"
{printf("<因子> --> '('<表达式>')'\n");;
    break;}
case 48:
#line 167 "2.y"
{printf("<关系运算符> --> =\n");;
    break;}
case 49:
#line 169 "2.y"
{printf("<关系运算符> --> #\n");;
    break;}
case 50:
#line 171 "2.y"
{printf("<关系运算符> --> <\n");;
    break;}
case 51:
#line 173 "2.y"
{printf("<关系运算符> --> <=\n");;
    break;}
case 52:
#line 175 "2.y"
{printf("<关系运算符> --> >\n");;
    break;}
case 53:
#line 177 "2.y"
{printf("<关系运算符> --> >=\n");;
    break;}
case 54:
#line 182 "2.y"
{printf("<当型循环语句> --> WHILE<条件>DO<语句>\n");;
    break;}
case 55:
#line 187 "2.y"
{printf("<过程调用语句> --> CALL<标识符>\n");;
    break;}
case 56:
#line 192 "2.y"
{printf("<读语句> --> READ(<标识符序列>)\n");;
    break;}
case 57:
#line 197 "2.y"
{printf("<写语句> --> WRITE(<表达式序列>)\n");;
    break;}
case 58:
#line 202 "2.y"
{printf("<表达式序列> --> <表达式>\n");;
    break;}
case 59:
#line 204 "2.y"
{printf("<表达式序列> --> <表达式序列>,<表达式>\n");;
    break;}
}

#line 705 "bison.simple"


  yyvsp -= yylen;
  yyssp -= yylen;
#if YYLSP_NEEDED
  yylsp -= yylen;
#endif

#if YYDEBUG
  if (yydebug)
    {
      short *yyssp1 = yyss - 1;
      YYFPRINTF (stderr, "state stack now");
      while (yyssp1 != yyssp)
	YYFPRINTF (stderr, " %d", *++yyssp1);
      YYFPRINTF (stderr, "\n");
    }
#endif

  *++yyvsp = yyval;
#if YYLSP_NEEDED
  *++yylsp = yyloc;
#endif

  /* Now `shift' the result of the reduction.  Determine what state
     that goes to, based on the state we popped back to and the rule
     number reduced by.  */

  yyn = yyr1[yyn];

  yystate = yypgoto[yyn - YYNTBASE] + *yyssp;
  if (yystate >= 0 && yystate <= YYLAST && yycheck[yystate] == *yyssp)
    yystate = yytable[yystate];
  else
    yystate = yydefgoto[yyn - YYNTBASE];

  goto yynewstate;


/*------------------------------------.
| yyerrlab -- here on detecting error |
`------------------------------------*/
yyerrlab:
  /* If not already recovering from an error, report this error.  */
  if (!yyerrstatus)
    {
      ++yynerrs;

#ifdef YYERROR_VERBOSE
      yyn = yypact[yystate];

      if (yyn > YYFLAG && yyn < YYLAST)
	{
	  YYSIZE_T yysize = 0;
	  char *yymsg;
	  int yyx, yycount;

	  yycount = 0;
	  /* Start YYX at -YYN if negative to avoid negative indexes in
	     YYCHECK.  */
	  for (yyx = yyn < 0 ? -yyn : 0;
	       yyx < (int) (sizeof (yytname) / sizeof (char *)); yyx++)
	    if (yycheck[yyx + yyn] == yyx)
	      yysize += yystrlen (yytname[yyx]) + 15, yycount++;
	  yysize += yystrlen ("parse error, unexpected ") + 1;
	  yysize += yystrlen (yytname[YYTRANSLATE (yychar)]);
	  yymsg = (char *) YYSTACK_ALLOC (yysize);
	  if (yymsg != 0)
	    {
	      char *yyp = yystpcpy (yymsg, "parse error, unexpected ");
	      yyp = yystpcpy (yyp, yytname[YYTRANSLATE (yychar)]);

	      if (yycount < 5)
		{
		  yycount = 0;
		  for (yyx = yyn < 0 ? -yyn : 0;
		       yyx < (int) (sizeof (yytname) / sizeof (char *));
		       yyx++)
		    if (yycheck[yyx + yyn] == yyx)
		      {
			const char *yyq = ! yycount ? ", expecting " : " or ";
			yyp = yystpcpy (yyp, yyq);
			yyp = yystpcpy (yyp, yytname[yyx]);
			yycount++;
		      }
		}
	      yyerror (yymsg);
	      YYSTACK_FREE (yymsg);
	    }
	  else
	    yyerror ("parse error; also virtual memory exhausted");
	}
      else
#endif /* defined (YYERROR_VERBOSE) */
	yyerror ("parse error");
    }
  goto yyerrlab1;


/*--------------------------------------------------.
| yyerrlab1 -- error raised explicitly by an action |
`--------------------------------------------------*/
yyerrlab1:
  if (yyerrstatus == 3)
    {
      /* If just tried and failed to reuse lookahead token after an
	 error, discard it.  */

      /* return failure if at end of input */
      if (yychar == YYEOF)
	YYABORT;
      YYDPRINTF ((stderr, "Discarding token %d (%s).\n",
		  yychar, yytname[yychar1]));
      yychar = YYEMPTY;
    }

  /* Else will try to reuse lookahead token after shifting the error
     token.  */

  yyerrstatus = 3;		/* Each real token shifted decrements this */

  goto yyerrhandle;


/*-------------------------------------------------------------------.
| yyerrdefault -- current state does not do anything special for the |
| error token.                                                       |
`-------------------------------------------------------------------*/
yyerrdefault:
#if 0
  /* This is wrong; only states that explicitly want error tokens
     should shift them.  */

  /* If its default is to accept any token, ok.  Otherwise pop it.  */
  yyn = yydefact[yystate];
  if (yyn)
    goto yydefault;
#endif


/*---------------------------------------------------------------.
| yyerrpop -- pop the current state because it cannot handle the |
| error token                                                    |
`---------------------------------------------------------------*/
yyerrpop:
  if (yyssp == yyss)
    YYABORT;
  yyvsp--;
  yystate = *--yyssp;
#if YYLSP_NEEDED
  yylsp--;
#endif

#if YYDEBUG
  if (yydebug)
    {
      short *yyssp1 = yyss - 1;
      YYFPRINTF (stderr, "Error: state stack now");
      while (yyssp1 != yyssp)
	YYFPRINTF (stderr, " %d", *++yyssp1);
      YYFPRINTF (stderr, "\n");
    }
#endif

/*--------------.
| yyerrhandle.  |
`--------------*/
yyerrhandle:
  yyn = yypact[yystate];
  if (yyn == YYFLAG)
    goto yyerrdefault;

  yyn += YYTERROR;
  if (yyn < 0 || yyn > YYLAST || yycheck[yyn] != YYTERROR)
    goto yyerrdefault;

  yyn = yytable[yyn];
  if (yyn < 0)
    {
      if (yyn == YYFLAG)
	goto yyerrpop;
      yyn = -yyn;
      goto yyreduce;
    }
  else if (yyn == 0)
    goto yyerrpop;

  if (yyn == YYFINAL)
    YYACCEPT;

  YYDPRINTF ((stderr, "Shifting error token, "));

  *++yyvsp = yylval;
#if YYLSP_NEEDED
  *++yylsp = yylloc;
#endif

  yystate = yyn;
  goto yynewstate;


/*-------------------------------------.
| yyacceptlab -- YYACCEPT comes here.  |
`-------------------------------------*/
yyacceptlab:
  yyresult = 0;
  goto yyreturn;

/*-----------------------------------.
| yyabortlab -- YYABORT comes here.  |
`-----------------------------------*/
yyabortlab:
  yyresult = 1;
  goto yyreturn;

/*---------------------------------------------.
| yyoverflowab -- parser overflow comes here.  |
`---------------------------------------------*/
yyoverflowlab:
  yyerror ("parser stack overflow");
  yyresult = 2;
  /* Fall through.  */

yyreturn:
#ifndef yyoverflow
  if (yyss != yyssa)
    YYSTACK_FREE (yyss);
#endif
  return yyresult;
}
#line 206 "2.y"


int main()
{
	char filename[20];
	printf("请输入要打开的文件名:");
	scanf("%s",filename);
	yyin=fopen(filename,"r");
	if(!yyin)
	{
		printf("\n对不起，不能打开文件.\n");
		return 0;
	}
	yyparse();
    fclose(yyin);
    return 0;
}

yyerror(char *s)
{
    printf("Error!\n");
}