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/GNU Fortran 7

9.84 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-7.1.0/gfortran/DCMPLX.html