HP OpenVMS Systems

Reads input from the standard input ( stdin ) under control of the wide-character format string.

Format

#include <wchar.h>

int wscanf (const wchar_t *format, ...);

Arguments

format

A pointer to a wide-character string containing the format specifications. For more information about format and conversion specifications and their corresponding arguments, see Chapter 2.

...

Optional expressions whose results correspond to conversion specifications given in the format specification.

If no conversion specifications are given, you can omit the input pointers. Otherwise, the function calls must have exactly as many input pointers as there are conversion specifications, and the conversion specifications must match the types of the input pointers.

Conversion specifications are matched to input sources in left-to-right order. Excess input pointers, if any, are ignored.

Description

The wscanf function is equivalent to the fwscanf function with the stdin arguments interposed before the wscanf arguments.

Return Values

n	The number of input items assigned. The number can be less than provided for, even zero, in the event of an early matching failure.
EOF	Indicates an error. An input failure occurred before any conversion.

Compute Bessel functions of the second kind.

Format

#include <math.h>

double y0 (double x);

float y0f (float x);

long double y0l (long double x);

double y1 (double x);

float y1f (float x);

long double y1l (long double x);

double yn (int n, double x);

float ynf (int n, float x);

long double ynl (int n, long double x);

Arguments

x

A positive, real value.

n

An integer.

Description

The y0 functions return the value of the Bessel function of the second kind of order 0.

The y1 functions return the value of the Bessel function of the second kind of order 1.

The yn functions return the value of the Bessel function of the second kind of order n.

Return Values

x	The relevant Bessel value of x of the second kind.
- HUGE_VAL	The x argument is 0.0; errno is set to ERANGE.
NaN	The x argument is negative or NaN; errno is set to EDOM.
0	Underflow occurred; errno is set to ERANGE.
HUGE_VAL	Overflow occurred; errno is set to ERANGE.

New functions are added to the HP C Run-Time Library with each version of HP C. These functions are implemented and shipped with the OpenVMS operating system, while the documentation and header files containing their prototypes are shipped with versions of the HP C compiler.

You might have a newer version of HP C that has header files and documentation for functions that are not supported on your older OpenVMS system. For example, if your target operating system platform is OpenVMS Version 7.2, you cannot use HP C RTL functions introduced on OpenVMS Version 7.3, even though they are documented in this manual.

This appendix contains several tables that list what HP C RTL functions are supported on recent OpenVMS versions. This is helpful for determining the functions to avoid using on your target OpenVMS platforms.

Also, for HP C and C++ Version 5.6 and higher, a C RTL backport object library is included with the compiler distribution kit. The backport object library allows developers on older versions of OpenVMS to use the latest C run-time library functions. For more information, see the file SYS$LIBRARY:DECC$CRTL.README on your system.

A.1 Functions Available on all OpenVMS VAX and OpenVMS Alpha Versions

Table A-1 lists functions available on all OpenVMS VAX and OpenVMS Alpha versions.

Table A-2 lists functions available on OpenVMS VAX and OpenVMS Alpha Version 6.2 and higher.

Table A-3 lists functions available on OpenVMS VAX and OpenVMS Alpha Version 7.0 and higher.

A.4 Functions Available on OpenVMS Alpha Version 7.0 and Higher