インテル® Fortran コンパイラー 14.0 ユーザー・リファレンス・ガイド

DBLE

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.

結果

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.

関連情報


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