インテル® Fortran コンパイラー 19.0 デベロッパー・ガイドおよびリファレンス

DPROD

Elemental Intrinsic Function (Specific): Produces a higher precision product. This is a specific function that has no generic function associated with it.

result = DPROD (x, y)

x

(Input) Must be of type REAL(4) or REAL(8).

y

(Input) Must have the same type and kind parameters as x.

Results

If x and y are of type REAL(4), the result type is double-precision real (REAL(8) or REAL*8). If x and y are of type REAL(8), the result type is REAL(16). The result value is equal to x* y.

The setting of compiler options specifying real size can affect this function.

Example

DPROD (2.0, -4.0) has the value -8.00D0.

DPROD (5.0D0, 3.0D0) has the value 15.00Q0.

The following shows another example:

  REAL(4) e
  REAL(8) d
  e = 123456.7
  d = 123456.7D0
  ! DPROD (e,e) returns 15241557546.4944

  ! DPROD (d,d) returns 15241556774.8899992813874268904328
Parent topic: C to D