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complex

From cppreference.com
< c‎ | numeric‎ | complex
Defined in header <complex.h>
#define complex _Complex
(since C99)

This macro expands to a type specifier used to identify complex types.

A program may undefine and perhaps then redefine the complex macro.

[edit] Example

#include <stdio.h>
#include <complex.h>
#include <math.h>
 
void print_complex(const char* note, complex z)
{
    printf("%s %f + %f*i\n", note, creal(z), cimag(z));
}
 
int main(void)
{
    double complex z = -1.0 + 2.0*I;
    print_complex("z =", z);
    print_complex("z^2 =", z * z);
    double complex z2 = ccos(2.0 * carg(z)) + csin(2.0 * carg(z))*I;
    print_complex("z^2 =", cabs(z) * cabs(z) * z2);
}

Output:

z = -1.000000 + 2.000000*i
z^2 = -3.000000 + -4.000000*i
z^2 = -3.000000 + -4.000000*i

[edit] References

  • C17 standard (ISO/IEC 9899:2018):
  • 7.3.1/4 complex (p: 136)
  • C11 standard (ISO/IEC 9899:2011):
  • 7.3.1/4 complex (p: 188)
  • C99 standard (ISO/IEC 9899:1999):
  • 7.3.1/2 complex (p: 170)

[edit] See also

imaginary type macro
(keyword macro) [edit]