crealf, creal, creall

 

C

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Numerics

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Complex number arithmetic

Types and the imaginary constant
complex _Complex_I CMPLX	imaginary _Imaginary_I I
Manipulation
cimag creal carg	cabs conj cproj
Power and exponential functions
cexp clog	cpow csqrt
Trigonometric functions
ccos csin ctan	cacos casin catan
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ccosh csinh ctanh	cacosh casinh catanh

 

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

Run this code

#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

See also

cimagcimagfcimagl (C99)(C99)(C99)	computes the imaginary part a complex number (function)
C++ documentation for real