CMPLX - The GNU Fortran Compiler
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### 8.49 `CMPLX` — Complex conversion function

Description:
  `CMPLX(X [, Y [, KIND]])` returns a complex number where X is converted to the real component. If Y is present it is converted to the imaginary component. If Y is not present then the imaginary component is set to 0.0. If X is complex then Y must not be present.
Standard:
  Fortran 77 and later
Class:
  Elemental function
Syntax:
  `RESULT = CMPLX(X [, Y [, KIND]])`
Arguments:

  X | The type may be `INTEGER`, `REAL`, or `COMPLEX`.
  Y | (Optional; only allowed if X is not `COMPLEX`.) May be `INTEGER` or `REAL`.
  KIND | (Optional) An `INTEGER` initialization expression indicating the kind parameter of the result.

Return value:
  The return value is of `COMPLEX` type, with a kind equal to KIND if it is specified. If KIND is not specified, the result is of the default `COMPLEX` kind, regardless of the kinds of X and Y.
Example:

                program test_cmplx
                    integer :: i = 42
                    real :: x = 3.14
                    complex :: z
                    z = cmplx(i, x)
                    print *, z, cmplx(x)
                end program test_cmplx

See also:
  COMPLEX