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Showing content from http://en.cppreference.com/w/c/numeric/math/../complex/cimag.html below:

cimagf, cimag, cimagl - cppreference.com

(1) (since C99) (2) (since C99) long double cimagl( long double complex z ); (3) (since C99)

#define cimag( z )

(4) (since C99)

1-3) Returns the imaginary part of z.

4)

Type-generic macro: if

z

has type

long double complex

long double imaginary

, or

long double

cimagl

is called. If

z

has type

float complex

float imaginary

, or

float

cimagf

is called. If

z

has type

double complex

double imaginary

double

, or any integer type,

cimag

is called.

[edit] Parameters [edit] Return value

The imaginary 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

#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:

[edit] References

C11 standard (ISO/IEC 9899:2011):

7.3.9.2 The cimag functions (p: 197)

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):

7.3.9.2 The cimag functions (p: 178-179)

7.22 Type-generic math <tgmath.h> (p: 335-337)

G.7 Type-generic math <tgmath.h> (p: 480)

[edit] See also

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