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cimagf, cimag, cimagl

Defined in header `<complex.h>`
float cimagf( float complex z );	(1)	(since C99)
double cimag( double complex z );	(2)	(since C99)
long double cimagl( long double complex z );	(3)	(since C99)
Defined in header `<tgmath.h>`
#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.

Parameters

complex argument

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.

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):

7.3.9.2 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)