Copyright Digital Equipment Corp. All rights reserved.
Conversion_Rules
The following tables summarize the conversion rules for assignment
statements.
Table 1: Conversion Rules for Integer, Logical, or Real Expressions
+-------------+------------------------------------------------+
|Scalar | Expression (E) |
|Memory |-------------------------------------------------
|Reference (V)| integer, logical, or real |
+-------------+------------------------------------------------+
| integer or | V=INT(E) |
| logical | |
+-------------+------------------------------------------------+
| REAL | V=REAL(E) |
| (KIND=4) | |
+-------------+------------------------------------------------+
| REAL | V=DBLE(E) |
| (KIND=8) | |
+-------------+------------------------------------------------+
| REAL | V=QEXT(E) |
| (KIND=16) | |
+-------------+------------------------------------------------+
| COMPLEX | V=CMPLX(REAL(E), 0.0) |
| (KIND=4) | |
+-------------+------------------------------------------------+
| COMPLEX | V=CMPLX(DBLE(E), 0.0) |
| (KIND=8) | |
+-------------+------------------------------------------------+
| COMPLEX | V=CMPLX(QEXT(E), 0.0) |
| (KIND=16) | |
+-------------+------------------------------------------------+
Table 2: Conversion Rules for Complex Expressions
+-------------+------------------------------------------------+
|Scalar | Expression (E) |
|Memory |-------------------------------------------------
|Reference (V)| complex |
+-------------+------------------------------------------------+
| integer or | V=INT(REAL(E)) |
| logical | Imaginary part of E is not used. |
+-------------+------------------------------------------------+
| REAL | V=REAL(REAL(E)) |
| (KIND=4) | Imaginary part of E is not used. |
+-------------+------------------------------------------------+
| REAL | V=DBLE(REAL(E)) |
| (KIND=8) | Imaginary part of E is not used. |
+-------------+------------------------------------------------+
| REAL | V=QEXT(REAL(E)) |
| (KIND=16) | Imaginary part of E is not used. |
+-------------+------------------------------------------------+
| COMPLEX | V=CMPLX(REAL(REAL(E)), REAL(AIMAG(E))) |
| (KIND=4) | |
+-------------+------------------------------------------------+
| COMPLEX | V=CMPLX(DBLE(REAL(E)), DBLE(AIMAG(E))) |
| (KIND=8) | |
+-------------+------------------------------------------------+
| COMPLEX | V=CMPLX(QEXT(REAL(E)), QEXT(AIMAG(E))) |
| (KIND=16) | |
+-------------+------------------------------------------------+