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ECVT
Section: Linux Programmer's Manual (3)Updated: 25 June 1999
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ecvt, fcvt - ÉâÆ°¾®¿ôÅÀ¿ô¤Îʸ»úÎó¤Ø¤ÎÊÑ´¹½ñ¼°
#include <stdlib.h>char *ecvt(double number, int ndigits, int *decpt, int *sign);
char *fcvt(double number, int ndigits, int *decpt, int *sign);
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´Ø¿ô ecvt() ¤Ï number ¤ò NUL ʸ»ú¤Ç½ªÃ¼¤µ¤ì¤¿ ndigits ʸ»ú (ndigits ¤Ï double ¤ÎÀºÅ٤ˤè¤Ã¤Æ·èÄꤵ¤ì¤ë ¥·¥¹¥Æ¥à°Í¸¤ÎÀ©¸ÂÃͤˤޤǸº¤é¤µ¤ì¤ë) ¤Îʸ»úÎó¤ØÊÑ´¹¤·¡¢ ¤½¤Îʸ»úÎó¤Ø¤Î¥Ý¥¤¥ó¥¿¤òÊÖ¤¹¡£ ºÇ¾å°Ì¤Î·å¤Ï number ¤¬ 0 ¤Ç¤Ê¤±¤ì¤Ð 0 °Ê³°¤Ç¤¢¤ë¡£ ²¼°Ì¤Î·å¤Ï´Ý¤á¤é¤ì¤ë¡£ ʸ»úÎó¤Ë¤Ï¾®¿ôÅÀ¤Ï´Þ¤Þ¤ì¤Ê¤¤¡£¤½¤Î¤«¤ï¤ê¤Ë¡¢Ê¸»úÎó¤ÎÀèƬ¤«¤é¤Î¾®¿ôÅÀ¤Î °ÌÃÖ¤¬ decpt ¤ËÊÝ»ý¤µ¤ì¤ë¡£ decpt ¤ÎÉé¤ÎÃͤϾ®¿ôÅÀ¤¬Ê¸»úÎó¤ÎÀèƬ¤Îº¸Â¦¤Ë¤¢¤ë¤³¤È¤ò°ÕÌ£¤¹¤ë¡£ ¤â¤·(number¤Î)Éä¹æ¤¬Éé¤Ê¤é¤Ð sign ¤Ï 0 °Ê³°¤ÎÃͤˡ¢ ¤½¤¦¤Ç¤Ê¤±¤ì¤Ð 0 ¤ËÀßÄꤵ¤ì¤ë¡£ ¤â¤· number ¤¬ 0 ¤Ê¤é¡¢*decpt ¤¬ 0 ¤« 1 ¤«¤Ï̤µ¬Äê¤Ç¤¢¤ë¡£´Ø¿ô fcvt() ¤Ï¡¢ndigits ¤¬¾®¿ôÅÀ°Ê²¼¤Îʸ»ú¿ô ¤Ç¤¢¤ë¤³¤È¤ò½ü¤¤¤Æ¤Ï ecvt() ¤ÈƱ¤¸¤Ç¤¢¤ë¡£
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´Ø¿ô ecvt() ¤È fcvt() ¤Ï number ¤Î ASCII ɽ¸½¤ò´Þ¤à ÀÅŪ¤ÊÎΰèÆâ¤Îʸ»úÎó¤Ø¤Î¥Ý¥¤¥ó¥¿¤òÊÖ¤¹¡£ ¤³¤Îʸ»úÎó¤Ï ecvt() ¤ä fcvt() ¤Î¸Æ½Ð¤·¤Î¤¿¤Ó¤Ë¾å½ñ¤¤µ¤ì¤ë¡£Ãí°Õ
¤³¤ì¤é¤Î´Ø¿ô¤Ï¸Å¤¤Êª¤Ç¤¢¤ë¡£Âå¤ï¤ê¤Ë sprintf() ¤ò»È¤¦¤³¤È¡£ Linux libc4 ¤È libc5 ¤Ç¤Ï ndigits ¤Î·¿¤Ï size_t ¤È»ØÄꤵ¤ì¤Æ¤¤¤ë¡£ ¾®¿ôÅÀ¤Ë¥Ô¥ê¥ª¥É¤ò»È¤ï¤Ê¤¤¥í¥±¡¼¥ë¤â¤¢¤ë¡£½àµò
SysVR2, XPG2´ØÏ¢¹àÌÜ
gcvt(3), setlocale(3), sprintf(3)