cexp(), cexpf(), cexpl()

Compute the complex base-e exponential of a complex number

Synopsis:

#include <complex.h>

double complex cexp(double complex z );

float complex cexpf(float complex z );

long double complex cexpl(long double complex z );

Arguments:

z: The complex value that you want to compute the complex base-e exponential of.

Library:

libm: The general-purpose math library.
libm-sve: (QNX Neutrino 7.1 or later) A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.

Your system requirements will determine how you should work with these libraries:

If you want only selected processes to run with the SVE version, you can include both libraries in your OS image and use the -l m or -l m-sve option to qcc to link explicitly against the appropriate one.
If you want all processes to use the SVE version, include libm-sve.so in your OS image and set up a symbolic link from libm.so to libm-sve.so. Use the -l m option to qcc to link against the library.

Note: Compile your program with the -fno-builtin option to prevent the compiler from using a built-in version of the function.

Description:

These functions compute the complex base-e exponential of z. If z = x+iy, the complex exponential is:

e^z = e^x cis(y)
   = e^x (cos(y) + i sin(y))

The exponential function is an entire function in the complex plane and has no branch cuts.

To check for error situations, use feclearexcept() and fetestexcept(). For example:

Call feclearexcept(FE_ALL_EXCEPT) before calling cexp(), cexpf(), or cexpl().
On return, if fetestexcept(FE_ALL_EXCEPT) is nonzero, then an error has occurred.

Returns:

If no errors occur, the complex base-e exponential of z.

If `z` is:	These functions return:	Errors:
±0 + 0`i`	1 + 0`i`	—
`x` + Inf`i`, for any finite `x`	NaN + NaN`i`	FE_INVALID
`x` + NaN`i`, for any finite `x`	NaN + NaN`i`	—
Inf + 0`i`	Inf + 0`i`	—
-Inf + `yi`, for any finite `y`	0 * cis(`y`)	—
Inf + `yi`, for any finite nonzero `y`	Inf * cis(`y`)	—
-Inf + Inf`i`	±0 ± 0`i`, where the signs are unspecified	—
Inf + Inf`i`	±Inf + NaN`i`, where the sign of the real part is unspecified	FE_INVALID
-Inf + NaN`i`	±0 ± 0`i`, where the signs are unspecified	—
Inf + NaN`i`	±Inf - NaN`i`, where the sign of the real part is unspecified	—
NaN + 0`i`	NaN + 0`i`	—
NaN + `yi`, for any nonzero `y`	NaN + NaN`i`	—
NaN + NaN`i`	NaN + NaN`i`	—

where cis(y) is cos(y) + i sin(y).

These functions raise FE_INEXACT if the FPU reports that the result can't be exactly represented as a floating-point number.

Classification:

C11, POSIX 1003.1

Safety:
Cancellation point	No
Interrupt handler	Yes
Signal handler	Yes
Thread	Yes