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  ±è¿µ´ë(2003-03-13 21:41:27, Hit : 13766, Vote : 1856
 calc.zip (3.6 KB), Download : 1483
 [¼Ò½º] Recursive-Descent ÆÄ½ÌÀ» ÀÌ¿ëÇÑ °è»ê±â ±¸Çö

// Á¦   ¸ñ: Recursive-Descent ÆÄ½ÌÀ» ÀÌ¿ëÇÑ °è»ê±â ±¸Çö
// ÀÛ¼ºÀÚ: ±è¿µ´ë( http://www.howto.pe.kr )

ÇÁ·Î±×·¥: Top-down parsing by Recursive-Descent¿Í °£´ÜÇÑ ¾î¼Àºí¸® ÀÎÅÍÇÁ¸®ÅÍ ¿¹Á¦

      ¼³¸í: Top down parsingÁß ÇϳªÀÎ recursive descent parsing(¼øÈ¯ Çϰ­Çü ºÐ¼®)¹æ¹ýÀ»
            »ç¿ëÇÑ ¼ö½Ä ±¸¹® ºÐ¼® ¿¹Á¦·Î¼­ Á¤¼ö, +, -, *, /, ±×¸®°í ( ... ) ·Î ±¸¼ºµÈ ¼ö½ÄÀ»
            Å°º¸µå·Î Á÷Á¢ Àоîµé¿© ÆÄ½ÌÇÑ ÈÄ À̸¦ ³»ºÎ ¾î¼Àºí¸®·Î º¯È¯ÇÏ¿© Ãâ·ÂÇÑ ÈÄ °ð¹Ù·Î
            ÀÎÅÍÇÁ¸®Æ®ÇÏ¿© ¼ö½ÄÀÇ °á°ú¸¦ È­¸éÀ¸·Î Ãâ·ÂÇÑ´Ù

      ¹®¹ý:
            expression = term { ( "+" | "-" ) term }
                      term = factor { ( "*" | "/" ) factor }
                     factor = number | "(" expression ")"

 ¾î¼Àºí¸®:
          PUSH Á¤¼ö - Á¤¼ö¸¦ stack¿¡ push ÇÑ´Ù
           ADD       - stackÀÇ top¿¡¼­ µÎ°³ÀÇ Á¤¼ö¸¦ popÇÏ¿© µ¡¼ÀÇÑ ÈÄ ´Ù½Ã push ÇÑ´Ù
           SUB       - stackÀÇ top¿¡¼­ µÎ°³ÀÇ Á¤¼ö¸¦ popÇÏ¿© »¬¼ÀÇÑ ÈÄ ´Ù½Ã push ÇÑ´Ù
           MUL       - stackÀÇ top¿¡¼­ µÎ°³ÀÇ Á¤¼ö¸¦ popÇÏ¿© °ö¼ÀÇÑ ÈÄ ´Ù½Ã push ÇÑ´Ù
           DIV       - stackÀÇ top¿¡¼­ µÎ°³ÀÇ Á¤¼ö¸¦ popÇÏ¿© Á¤¼ö ³ª´°¼ÀÇÑ ÈÄ ´Ù½Ã push ÇÑ´Ù

    ÄÄÆÄÀÏ:
            $ gcc -v
            Reading specs from /usr/lib/gcc-lib/i386-redhat-linux/egcs-2.91.66/specs
            gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)

    ÀÛ¼ºÀÚ:
           ±è¿µ´ë ( http://www.howto.pe.kr )





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