crealf, creal, creall
Defined in header <complex.h> |
||
---|---|---|
float crealf( float complex z ); |
(1) | (since C99) |
double creal( double complex z ); |
(2) | (since C99) |
long double creall( long double complex z ); |
(3) | (since C99) |
Defined in header <tgmath.h> |
||
#define creal( z ) |
(4) | (since C99) |
1-3) Returns the real part of
z
.
4) Type-generic macro: if
z
has type
long double complex
,
long double imaginary
, or
long double
,
creall
is called. If
z
has type
float complex
,
float imaginary
, or
float
,
crealf
is called. If
z
has type
double complex
,
double imaginary
,
double
, or any integer type,
creal
is called.
Parameters
z | - | complex argument |
Return value
The real part of z
.
This function is fully specified for all possible inputs and is not subject to any errors described in math_errhandling.
Notes
For any complex variable z
, z == creal(z) + I*cimag(z)
.
Example
#include <stdio.h> #include <complex.h> int main(void) { double complex z = 1.0 + 2.0*I; printf("%f%+fi\n", creal(z), cimag(z)); }
Output:
1.000000+2.000000i
References
- C11 standard (ISO/IEC 9899:2011):
- 7.3.9.6 The creal functions (p: 198-199)
- 7.25 Type-generic math <tgmath.h> (p: 373-375)
- G.7 Type-generic math <tgmath.h> (p: 545)
- C99 standard (ISO/IEC 9899:1999):
- 7.3.9.5 The creal functions (p: 180)
- 7.22 Type-generic math <tgmath.h> (p: 335-337)
- G.7 Type-generic math <tgmath.h> (p: 480)
See also
(C99)(C99)(C99)
|
computes the imaginary part a complex number (function) |
C++ documentation for real |
© cppreference.com
Licensed under the Creative Commons Attribution-ShareAlike Unported License v3.0.
https://en.cppreference.com/w/c/numeric/complex/creal