In C, **`imaginary`** is a macro that enables the programmer to write pure imaginary numbers.
>The `imaginary` macro expands to the  `_Imaginary` macro.

To use the `imaginary` macro, the program needs to include the header file `<complex.h>` as shown below:
```C
#include <complex.h>
```

# Syntax
You can define a variable `x` for pure imaginary numbers through the `imaginary` macro in three ways:
```c
float imaginary x
double imaginary x
long double imaginary x
```

# Examples
The following code demonstrates how to declare, define, and print an imaginary number.
After declaring an imaginary number `x`, it is added to a real number to form a complex number. The program then uses the `creal()` function to extract the real number, followed by the `cimag()` function to extract the imaginary number in order to print the complex number. 

#include <stdio.h>
#include <complex.h>

int main()
{
  // imaginary
  double complex x = 4.0 * I; 
  // real
  double real = 9.0; 
  // complex number
  double complex num = real + x; 
  // print complex number
  printf("z = %.1f%+.1fi\n", creal(num), cimag(num));

}

gcc compiler

> **Note**: According to the official documentation, "A compiler that defines `__STDC_IEC_559_COMPLEX__` is not required to support imaginary numbers." 
We can use the `complex` macro instead of the `imaginary` macro in line 7 and that will get the job done.



gcc.tar.gz

What is imaginary in C?

Imaginary in C, defined by the imaginary macro, is used for pure imaginary numbers and requires <complex.h>.