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DBLE — Double conversion functionDBLE(X) Converts X to double precision real type. 
DFLOAT is an alias for DBLE
     X = DBLE(X)
X = DFLOAT(X)
     | X | The type shall be INTEGER(*),REAL(*), orCOMPLEX(*). | 
          program test_dble
              real    :: x = 2.18
              integer :: i = 5
              complex :: z = (2.3,1.14)
              print *, dble(x), dble(i), dfloat(z)
          end program test_dble