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4.2.7 if ʸ

if ʸ¤Ë¤Ï

 
if ( ¼° )             if ( ¼° )
    ʸ       µÚ¤Ó         ʸ
else
    ʸ

¤Î 2 ¼ïÎब¤¢¤ë. ¤³¤ì¤é¤Îưºî¤ÏÌÀ¤é¤«¤Ç¤¢¤ë¤¬, ʸ¤Î°ÌÃÖ¤Ë if ʸ ¤¬Í褿¾ì¹ç¤ËÃí°Õ¤òÍפ¹¤ë. ¼¡¤ÎÎã¤ò¹Í¤¨¤Æ¤ß¤è¤¦.

 
if ( ¼° )
    if ( ¼° ) ʸ
else
    ʸ

¤³¤Î¾ì¹ç, »ú²¼¤²¤«¤é¤Ï, else °Ê²¼¤Ï, ºÇ½é¤Î if ¤ËÂбþ¤¹¤ë ¤è¤¦¤Ë¸«¤¨¤ë¤¬, ¥Ñ¡¼¥¶¤Ï, ¼«Æ°Åª¤Ë 2 ÈÖÌܤΠif ¤ËÂбþ¤¹¤ë¤ÈȽÃǤ¹¤ë. ¤¹¤Ê¤ï¤Á, 2 ¼ïÎà¤Î if ʸ¤òµö¤·¤¿¤¿¤á¤Ë, ʸˡ¤ËÛ£ËæÀ­¤¬¸½¤ì, ¤½¤ì¤ò ²ò¾Ã¤¹¤ë¤¿¤á¤Ë, else °Ê²¼¤Ï, ºÇ¤â¶á¤¤ if ¤ËÂбþ¤¹¤ë¤È ¤¤¤¦µ¬Â§¤¬Å¬ÍѤµ¤ì¤ë¤Î¤Ç¤¢¤ë. ½¾¤Ã¤Æ, ¤³¤ÎÎã¤Ï,

 
if ( ¼° ) {
    if ( ¼° ) ʸ else ʸ
}

¤È¤¤¤¦°ÕÌ£¤È¤Ê¤ë. »ú²¼¤²¤ËÂбþ¤µ¤»¤ë¤¿¤á¤Ë¤Ï,

 
if ( ¼° ) {
    if ( ¼° ) ʸ
} else
    ʸ

¤È¤·¤Ê¤±¤ì¤Ð¤Ê¤é¤Ê¤¤.

´Ø¿ô¤ÎÃæ¤Ç¤Ê¤¯, top level ¤Ç if ʸ¤òÍѤ¤¤ë¤È¤­¤Ï $ ¤Þ¤¿¤Ï ; ¤Ç½ªÎ»¤¹¤ëɬÍפ¬¤¢¤ë. ¤³¤ì¤é¤¬¤Ê¤¤¤È¼¡¤Îʸ¤¬¤è¤ß¤È¤Ð¤µ¤ì¤ë.



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