finite

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Version: 2004-10-31 (openSuse - 09/10/07)

Section: 3 (Bibliothèques de fonctions)

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finite, finitef, finitel, isinf, isinff, isinfl, isnan, isnanf, isnanl - BSD ¤ÎÉâÆ°¾®¿ôÅÀʬÎà´Ø¿ô

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#define _BSD_SOURCE




#include <math.h>



int finite(double x);




int finitef(float x);




int finitel(long double x);



int isinf(double x);




int isinff(float x);




int isinfl(long double x);



int isnan(double x);




int isnanf(float x);




int isnanl(long double x);

ÀâÌÀ

finite() ´Ø¿ô¤Ï¡¢ x ¤¬Ìµ¸ÂÂç¤ä̵¸úÃÍ (NaN) ¤Î¤¤¤º¤ì¤Ç¤â¤Ê¤¤ ¾ì¹ç¤Ë 0 °Ê³°¤ÎÃͤòÊÖ¤·¡¢¤½¤ì°Ê³°¤Î¾ì¹ç¤Ï 0 ¤òÊÖ¤¹¡£

isnan() ´Ø¿ô¤Ï¡¢ x ¤¬ NaN ¤Î¾ì¹ç 0 °Ê³°¤ÎÃͤòÊÖ¤·¡¢ ¤½¤ì°Ê³°¤Î¾ì¹ç¤Ï 0 ¤òÊÖ¤¹¡£

isinf() ´Ø¿ô¤Ï¡¢ x ¤¬Àµ¤Î̵¸ÂÂç¤Ç¤¢¤ì¤Ð 1 ¤òÊÖ¤·¡¢x ¤¬Éé¤Î̵¸ÂÂç¤Ç ¤¢¤ì¤Ð -1 ¤òÊÖ¤¹¡£¤½¤ì°Ê³°¤Î¾ì¹ç¤Ï 0 ¤òÊÖ¤¹¡£

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¤³¤ì¤é¤Î´Ø¿ô¤ÏÇѻߤµ¤ì¤¿ÅÀ¤ËÃí°Õ¤¹¤ë¤³¤È¡£ C99 ¤Ç¤Ï¡¢¤³¤ì¤é¤ÎÃÖ¤­´¹¤¨¤È¤·¤Æ (¤É¤ó¤Ê·¿¤Ë¤âŬÍѤǤ­¤ë) isfinite(), isinf(), isnan() ¤È¤¤¤¦¥Þ¥¯¥í¤¬ÄêµÁ¤µ¤ì¤Æ¤¤¤ë¡£ ¤µ¤é¤Ë C99 ¤Î isinf() ¤ÏÊÖ¤êÃͤ˴ؤ·¤Æ¼å¤¤°ÕÌ£¤Ç¤ÎÊݾڤ·¤«¤Ê¤¤¤³¤È¤Ë¤â Ãí°Õ¤¹¤ë¤³¤È¡£¾ÜºÙ¤Ï fpclassify(3) ¤ò»²¾È¡£

glibc ¥·¥¹¥Æ¥à¤Ç¤Ï¡¢¤³¤ì¤é¤Î´Ø¿ô¤Ï _BSD_SOURCE¡¢ _SVID_SOURCE¡¢ _GNU_SOURCE ¤Î¤¤¤º¤ì¤«¤¬ÄêµÁ¤µ¤ì¤¿¾ì¹ç¤Ë <math.h> ¤ÇÀë¸À¤µ¤ì¤ë¡£¤Þ¤¿¡¢ isnan() ·Ï¤Î´Ø¿ô¤Ï _XOPEN_SOURCE ¤¬ÄêµÁ¤µ¤ì¤¿¾ì¹ç¤Ë Àë¸À¤µ¤ì¤ë¡£

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fpclassify(3), feature_test_macros(7)