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isinf, isnan, isnanf —

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Standard C Library (libc, -lc)

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int isinf(double) int isnan(double) int isnanf(float)

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isinf() ?ؿ??ϡ????ͤ? ??̵?????? “infinity” ?Ǥ????? 1 ?򡢤????Ǥʤ????? 0 ???֤??ޤ???

isnan() ?ؿ??????? isnanf() ?ؿ??ϡ??????ټ¿??ޤ???ñ???ټ¿??? ???????͡? “not-a-number” ?Ǥ????? 1 ???? ?????Ǥʤ????? 0 ???֤??ޤ???

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math(3) IEEE Standard for Binary Floating-Point Arithmetic, Std 754-1985, ANSI.

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