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crealf, creal, creall

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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.

Contents

[edit] Parameters

z - complex argument

[edit] 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

[edit] Notes

For any complex variable z, z == creal(z) + I*cimag (z).

[edit] 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

[edit] 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)

[edit] See also

cimagcimagfcimagl

(C99)(C99)(C99)

computes the imaginary part a complex number
(function) [edit]

C++ documentation for real

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