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STRTOD !!!STRTOD NAME SYNOPSIS DESCRIPTION RETURN VALUE ERRORS CONFORMING TO SEE ALSO ---- !!NAME strtod, strtof, strtold - convert ASCII string to floating point number !!SYNOPSIS __#include __ __double strtod(const char *__''nptr''__, char **__''endptr''__); float strtof(const char *__''nptr''__, char **__''endptr''__); long double strtold(const char *__''nptr''__, char **__''endptr''__);__ !!DESCRIPTION The __strtod__, __strtof__, and __strtold__ functions convert the initial portion of the string pointed to by ''nptr'' to __double__, __float__, and __long double__ representation, respectively. The expected form of the (initial portion of the) string is optional leading white space as recognized by ''is- space''(3), an optional plus (``+'') or minus sign (``-'') and then either (i) a decimal number, or (ii) a hexadecimal number, or (iii) an infinity, or (iv) a NAN (not-a-number). A ''decimal number'' consists of a nonempty sequence of decimal digits possibly containing a radix character (decimal point, locale dependent, usually ``.''), optionally followed by a decimal exponent. A decimal exponent consists of an ``E'' or ``e'', followed by an optional plus or minus sign, followed by a non-empty sequence of decimal digits, and indicates multiplication by a power of 10. A ''hexadecimal number'' consists of a ``0x'' or ``0X'' followed by a nonempty sequence of hexadecimal digits possibly containing a radix character, optionally followed by a binary exponent. A binary exponent consists of a ``P'' or ``p'', followed by an optional plus or minus sign, followed by a non-empty sequence of decimal digits, and indicates multiplication by a power of 2. At least one of radix character and binary exponent must be present. An ''infinity'' is either ``INF'' or ``INFINITY'', disregarding case. A ''NAN'' is ``NAN'' (disregarding case) optionally followed by `(', a sequence of characters, followed by ')'. The character string specifies in an implementation-dependent way the type of NAN. !!RETURN VALUE These functions return the converted value, if any. If ''endptr'' is not __NULL__, a pointer to the character after the last character used in the conversion is stored in the location referenced by ''endptr''. If no conversion is performed, zero is returned and the value of ''nptr'' is stored in the location referenced by ''endptr''. If the correct value would cause overflow, plus or minus __HUGE_VAL__ (__HUGE_VALF__, __HUGE_VALL__) is returned (according to the sign of the value), and __ERANGE__ is stored in ''errno''. If the correct value would cause underflow, zero is returned and __ERANGE__ is stored in ''errno''. !!ERRORS __ERANGE__ Overflow or underflow occurred. !!CONFORMING TO ANSI C describes __strtod__, C99 describes the other two functions. !!SEE ALSO atof(3), atoi(3), atol(3), strtol(3), strtoul(3) ----
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