csqrt(3M)

DESCRIPTION

These functions are available only for IA-64.

csqrt() returns the complex square root of z in the range of the right half-plane (including the imaginary axis). There is a branch cut along the negative real axis.

csqrtf() is a float complex version of csqrt(); it takes a float complex argument and returns a float complex result.

USAGE

To use these functions, compile with the default -Ae option. Make sure your program includes <complex.h>. Link in the math library by specifying -lm on the compiler or linker command line.

RETURN VALUES

csqrt(conj(z)) = conj(csqrt(z)).

csqrt(±0+i0) returns +0+i0.

csqrt(x+iInf) returns +Inf+iInf, for all x (including NaN).

csqrt(x+iNaN) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite x.

csqrt(-Inf+iy) returns +0+iInf, for finite positive-signed y.

csqrt(+Inf+iy) returns +Inf+i0, for finite positive-signed y.

csqrt(-Inf+iNaN) returns NaN+-iInf (where the sign of the imaginary part of the result is unspecified).

csqrt(+Inf+iNaN) returns +Inf+iNaN.

csqrt(NaN+iy) returns NaN+iNaN and optionally raises the invalid floating-point exception, for finite y.

csqrt(NaN+iNaN) returns NaN+iNaN.

ERRORS

No errors are defined.

SEE ALSO

sqrt(3M), cpow(3M), complex(5).

STANDARDS CONFORMANCE

csqrt(), csqrtf(): ISO/IEC C99 (including Annex G, IEC 60559-compatible complex arithmetic)