DREAL — Double real part functionDREAL(Z) returns the real part of complex variable Z.
     RESULT = DREAL(A)
     | A | The type shall be COMPLEX(8). | 
REAL(8).
               program test_dreal
              complex(8) :: z = (1.3_8,7.2_8)
              print *, dreal(z)
          end program test_dreal