07-04-2008
Hi,
By default HPUX supports backward compatibility. Aries is used to simulate PA-RISC environment for PA-RISC Application.
But, I always suggest to recompile your application on Itanium systems to get all the benefit of IA platform.
Regards,
Venky
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strtod(3C) strtod(3C)
NAME
strtod(), strtof(), strtold(), strtow(), strtoq(), atof() - convert string to floating-point number
SYNOPSIS
Itanium(R)-based Systems Only
DESCRIPTION
returns, as a double-precision floating-point number, the value represented by the character string pointed to by str. The string is
scanned (leading white-space characters as defined by in ctype(3C) are ignored) up to the first unrecognized character. If no conversion
can take place, zero is returned.
recognizes characters in the following sequence:
1. An optional string of white space characters which are ignored
2. An optional sign
and one of the following:
3. A string of digits optionally containing a radix character, followed by an optional or followed by an optional sign or space,
followed by an integer
4. One of or ignoring case
5. ignoring case
6. For Itanium-based system only: or then a nonempty sequence of hexadecimal digits optionally containing a radix character, then
a or followed by an optional sign or space, followed by a decimal integer
The radix character is determined by the loaded environment (see setlocale(3C)). If has not been called successfully, the default environ-
ment, "C", is used (see lang(5)). The default environment specifies a period as the radix character.
In the hexadecimal form, the optionally signed decimal integer following the or is interpreted as the power of 2 by which the significant
part is to be scaled.
If the value of ptr is not the variable to which it points is set to point at the character after the last number, if any, that was recog-
nized. If no number can be formed, is set to str, and zero is returned.
is equivalent to
is a version of it returns a result. For PA-RISC and for Itanium-based systems, if the user has defined the result type is declared as a
instead of as a The declaration with a is obsolescent.
Itanium-based Systems Only
is a version of it returns a result.
is an version of it returns an result.
is equivalent to
EXTERNAL INFLUENCES
Environment Variables
determines the value of the radix character within the currently loaded environment.
APPLICATION USAGE
To use (for Itanium-based systems) or compile with the option.
RETURN VALUE
If the correct value would cause overflow, returns (equal to according to the sign of the value, and sets to
If the correct value would be nonzero but too small in magnitude to represent as a nonzero then returns zero and sets to For Itanium-based
system, also sets to whenever the conversion of its input parameter character string to raises the underflow exception.
When the input parameter character string for after the optional white space and sign, is either (case insensitive) or (case insensitive)
will return according to the sign indicated by the character string.
When the input parameter character string for after the optional white space and sign, is (case insensitive), will return a quiet NaN.
On Itanium-based systems, these functions round correctly for hexadecimal input strings, and round correctly for up to 36 significant deci-
mal digits, according to the specification in ISO/IEC C99.
SEE ALSO
ctype(3C), setlocale(3C), scanf(3S), strtol(3C), lang(5), thread_safety(5).
STANDARDS CONFORMANCE
strtod(3C)