Intel® Fortran Compiler 16.0 User and Reference Guide
Elemental Intrinsic Function (Generic): Converts a number to double-precision real type.
result = DBLE (a)
a |
(Input) Must be of type integer, real, or complex. |
The result type is double precision real (by default, REAL(8) or REAL*8). Functions that cause conversion of one data type to another type have the same effect as the implied conversion in assignment statements.
If a is of type double precision, the result is the value of the a with no conversion (DBLE( a) = a).
If a is of type integer or real, the result has as much precision of the significant part of a as a double precision value can contain.
If a is of type complex, the result has as much precision of the significant part of the real part of a as a double precision value can contain.
Specific Name 1 |
Argument Type |
Result Type |
|---|---|---|
|
INTEGER(1) |
REAL(8) |
|
INTEGER(2) |
REAL(8) |
|
INTEGER(4) |
REAL(8) |
|
INTEGER(8) |
REAL(8) |
|
DBLE2 |
REAL(4) |
REAL(8) |
REAL(8) |
REAL(8) |
|
|
DBLEQ |
REAL(16) |
REAL(8) |
COMPLEX(4) |
REAL(8) |
|
COMPLEX(8) |
REAL(8) |
|
COMPLEX(16) |
REAL(8) |
|
1These specific functions cannot be passed as actual arguments. 2 The setting of compiler options specifying double size can affect DBLE. |
||
If the argument is a boz-constant, the result is affected by the assume old-boz option. The default option setting, noold-boz, treats the argument as a bit string that represents a value of the data type of the intrinsic, that is, the bits are not converted. If setting old-boz is specified, the argument is treated as a signed integer and the bits are converted.
DBLE (4) has the value 4.0.
DBLE ((3.4, 2.0)) has the value 3.4.