CEXP(3) Library Functions Manual CEXP(3)

cexp cexpf cexpl — complex exponential functions

#include <complex.h>

double complex cexp(double complex z);
float complex cexpf(float complex z);
long double complex cexpl(long double complex z);

The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the requirements described here and the ISO C standard is unintentional. This volume of POSIX.1-2024 defers to the ISO C standard.

These functions shall compute the complex exponent of z, defined as .

These functions shall return the complex exponential value of z.

cexp ( conj ( z)), cexpf ( conjf ( z)), and cexpl ( conjl ( z)) shall return exactly the same value as conj ( cexp ( z)), conjf ( cexpf ( z)), and conjl ( cexpl ( z)), respectively, including for the special values of z below.

If z is ±0 + i 0, 1 + i 0 shall be returned.

If z is x + i Inf where x is finite, NaN + i NaN shall be returned and the invalid floating-point exception shall be raised.

If z is x + i NaN where x is finite, NaN + i NaN shall be returned and the invalid floating-point exception may be raised.

If z is +Inf + i 0, +Inf + i 0 shall be returned.

If z is -Inf + iy where y is finite, +0 ( cos ( y) + isin ( y)) shall be returned.

If z is +Inf + iy where y is non-zero and finite, +Inf ( cos ( y) + isin ( y)) shall be returned.

If z is -Inf + i Inf, ±0 ± i 0 shall be returned; the signs of the real and imaginary parts of the result are unspecified.

If z is +Inf + i Inf, ±Inf + i NaN shall be returned and the invalid floating-point exception shall be raised; the sign of the real part of the result is unspecified.

If z is -Inf + i NaN, ±0 ± i 0 shall be returned; the signs of the real and imaginary parts of the result are unspecified.

If z is +Inf + i NaN, ±Inf + i NaN shall be returned; the sign of the real part of the result is unspecified.

If z is NaN + i 0, NaN + i 0 shall be returned.

If z is NaN + iy where y is any non-zero number, NaN + i NaN shall be returned and the invalid floating-point exception may be raised.

If z is NaN + i NaN, NaN + i NaN shall be returned.

No errors are defined.

None.

None.

None.

None.

clog(3)

XBD <complex.h>

First released in Issue 6. Derived from the ISO/IEC 9899:1999 (“ISO C99”) standard.

Austin Group Defect 1302 is applied, aligning these functions with the ISO/IEC 9899:2018 standard.

June 14, 2024 posix.fail