#include <complex.h>
The <complex.h> header shall define the following macros:
The macros imaginary and _Imaginary_I shall be defined if and only if the implementation supports imaginary types.
An application may undefine and then, perhaps, redefine the complex, imaginary, and I macros.
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.
double cabs(double complex); float cabsf(float complex); long double cabsl(long double complex); double complex cacos(double complex); float complex cacosf(float complex); double complex cacosh(double complex); float complex cacoshf(float complex); long double complex cacoshl(long double complex); long double complex cacosl(long double complex); double carg(double complex); float cargf(float complex); long double cargl(long double complex); double complex casin(double complex); float complex casinf(float complex); double complex casinh(double complex); float complex casinhf(float complex); long double complex casinhl(long double complex); long double complex casinl(long double complex); double complex catan(double complex); float complex catanf(float complex); double complex catanh(double complex); float complex catanhf(float complex); long double complex catanhl(long double complex); long double complex catanl(long double complex); double complex ccos(double complex); float complex ccosf(float complex); double complex ccosh(double complex); float complex ccoshf(float complex); long double complex ccoshl(long double complex); long double complex ccosl(long double complex); double complex cexp(double complex); float complex cexpf(float complex); long double complex cexpl(long double complex); double cimag(double complex); float cimagf(float complex); long double cimagl(long double complex); double complex clog(double complex); float complex clogf(float complex); long double complex clogl(long double complex); double complex conj(double complex); float complex conjf(float complex); long double complex conjl(long double complex); double complex cpow(double complex, double complex); float complex cpowf(float complex, float complex); long double complex cpowl(long double complex, long double complex); double complex cproj(double complex); float complex cprojf(float complex); long double complex cprojl(long double complex); double creal(double complex); float crealf(float complex); long double creall(long double complex); double complex csin(double complex); float complex csinf(float complex); double complex csinh(double complex); float complex csinhf(float complex); long double complex csinhl(long double complex); long double complex csinl(long double complex); double complex csqrt(double complex); float complex csqrtf(float complex); long double complex csqrtl(long double complex); double complex ctan(double complex); float complex ctanf(float complex); double complex ctanh(double complex); float complex ctanhf(float complex); long double complex ctanhl(long double complex); long double complex ctanl(long double complex);
The following sections are informative.
#undef I #define j _Imaginary_I
An I suffix to designate imaginary constants is not required, as multiplication by I provides a sufficiently convenient and more generally useful notation for imaginary terms. The corresponding real type for the imaginary unit is float, so that use of I for algorithmic or notational convenience will not result in widening types.
On systems with imaginary types, the application has the ability to control whether use of the macro I introduces an imaginary type, by explicitly defining I to be _Imaginary_I or _Complex_I. Disallowing imaginary types is useful for some applications intended to run on implementations without support for such types.
The macro _Imaginary_I provides a test for whether imaginary types are supported.
The cis() function (cos(x) + I*sin(x)) was considered but rejected because its implementation is easy and straightforward, even though some implementations could compute sine and cosine more efficiently in tandem.
cerf() cerfc() cexp2() | cexpm1() clog10() clog1p() |
clog2()
clgamma()
ctgamma()
|
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