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/GNU Fortran 5

9.77 DCMPLX — Double complex conversion function

Description:
DCMPLX(X [,Y]) returns a double 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:
GNU extension
Class:
Elemental function
Syntax:
RESULT = DCMPLX(X [, Y])
Arguments:
X The type may be INTEGER, REAL, or COMPLEX.
Y (Optional if X is not COMPLEX.) May be INTEGER or REAL.
Return value:
The return value is of type COMPLEX(8)
Example:
program test_dcmplx
    integer :: i = 42
    real :: x = 3.14
    complex :: z
    z = cmplx(i, x)
    print *, dcmplx(i)
    print *, dcmplx(x)
    print *, dcmplx(z)
    print *, dcmplx(x,i)
end program test_dcmplx

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https://gcc.gnu.org/onlinedocs/gcc-5.4.0/gfortran/DCMPLX.html