VMS Help FORTRAN, Statements, Assignment  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  Assigns the value of the expression to the variable.
  Arithmetic/Logical/Character assignment takes the form:

     v = e

     v  Is a scalar memory reference.

     e  Is an arithmetic expression (arithmetic assignment),
        a character scalar memory reference (character assignment),
        or a logical scalar memory reference (logical assignment).

  The right side of the equation must evaluate to a data type
  compatible with the variable on the left side.  If aggregates are
  involved, the aggregate reference and the aggregate must have
  matching structures.

1 - Conversion Rules

  The following tables summarize the conversion rules for assignment
  statements.  MS signifies the most significant (high-order) bit; LS
  signifies the least significant (low-order) bit.

  ----------------------------------------------------------------
  |Variable |          Expression (E)                            |
  |or Array |-----------------------------------------------------
  |Element  |integer or logical |      REAL     |    REAL*8      |
  ----------------------------------------------------------------
  | integer |  Assign E to V    | Truncate E to | Truncate E to  |
  |  or     |                   | integer and   | integer and    |
  | logical |                   | assign to V   | assign to V    |
  ----------------------------------------------------------------
  |  REAL   | Append fraction   | Assign E to V | Assign MS por- |
  |         | (.0) to E and     |               | tion of E to V;|
  |         | assign to V       |               | LS portion of E|
  |         |                   |               | is rounded     |
  ----------------------------------------------------------------
  |  REAL*8 | Append fraction   | Assign E to MS| Assign E to V  |
  |         | (.0) to E and     | portion of V; |                |
  |         | assign to V       | LS portion of |                |
  |         |                   | V is 0        |                |
  ----------------------------------------------------------------
  | REAL*16 | same as above     | same as above | Assign E to MS |
  |         |                   |               | portion of V;  |
  |         |                   |               | LS portion of V|
  |         |                   |               | is 0           |
  ----------------------------------------------------------------
  | COMPLEX | Append fraction   | Assign E to   | Assign MS por- |
  |         | (.0) to E and     | real part of  | tion of E to   |
  |         | assign to real    | V; imaginary  | real part of V;|
  |         | part of V; imagin-| part of V is  | LS portion of  |
  |         | ary part of V is  | 0.0           | E is rounded;  |
  |         | 0.0               |               | imaginary part |
  |         |                   |               | of V is 0.0    |
  ----------------------------------------------------------------
  |COMPLEX*16| Append fraction  | Assign E to MS | Assign E to   |
  |          | (.0) to E and    | portion of     | real part of  |
  |          | assign to V;     | real part of V;| V; imaginary  |
  |          | imaginary part of| imaginary part | part is 0.0   |
  |          | V is 0.0         | of V is 0.0    |               |
  ----------------------------------------------------------------

  continued chart
  ----------------------------------------------------------------
  |Variable |          Expression (E)                            |
  |or Array |-----------------------------------------------------
  |Element  |   REAL*16   |    COMPLEX    |    COMPLEX*16        |
  ----------------------------------------------------------------
  | integer | Truncate E  | Truncate real | Truncate real part of|
  | or      | to integer  | part of E to  | E to integer and     |
  |logical  | and assign  | integer and   | assign to V; imagin- |
  |         | to V        | assign to V;  | ary part of E is not |
  |         |             | imaginary part| used                 |
  |         |             | is not used   |                      |
  ----------------------------------------------------------------
  |  REAL   | Assign MS   | Assign real   | Assign MS portion of |
  |         | portion of E| part of E to  | the real part of E to|
  |         | to V; LS    | V; imaginary  | V; LS portion of the |
  |         | portion of E| part of E is  | real part of E is    |
  |         | is rounded  | not used      | rounded; imaginary   |
  |         |             |               | part of E is not used|
  ----------------------------------------------------------------
  | REAL*8  | same as     | Assign real   | Assign real part of E|
  |         | above       | part of E to  | to V; imaginary part |
  |         |             | MS of V; LS   | of E is not used     |
  |         |             | portion of V  |                      |
  |         |             | is 0; imagin- |                      |
  |         |             | ary part of E |                      |
  |         |             | is not used   |                      |
  ----------------------------------------------------------------
  | REAL*16 | Assign E to | same as above | Assign real part of E|
  |         | V           |               | to MS portion of V;  |
  |         |             |               | LS portion of real   |
  |         |             |               | part of V is 0; imag-|
  |         |             |               | inary part of E is   |
  |         |             |               | not used             |
  ----------------------------------------------------------------
  | COMPLEX | Assign MS   | Assign E to V | Assign MS portion of |
  |         | portion of E|               | real part of E to    |
  |         | to real part|               | real part of V; LS   |
  |         | of V; LS    |               | portion of real part |
  |         | portion of E|               | of E is rounded.     |
  |         | is rounded; |               | Assign MS portion of |
  |         | imaginary   |               | imaginary part of E  |
  |         | part of V is|               | to imaginary part of |
  |         | 0.0         |               | V; LS portion of     |
  |         |             |               | imaginary part of E  |
  |         |             |               | is rounded           |
  ----------------------------------------------------------------
  |COMPLEX*16| same as    | Assign real    | Assign E to V       |
  |          | above      | part of E to   |                     |
  |          |            | MS portion of  |                     |
  |          |            | real part of V;|                     |
  |          |            | LS portion of  |                     |
  |          |            | real part is 0.|                     |
  |          |            | Assign imagin- |                     |
  |          |            | ary part of E  |                     |
  |          |            | to MS portion  |                     |
  |          |            | of imaginary   |                     |
  |          |            | part of V;     |                     |
  |          |            | LS portion of  |                     |
  |          |            | imaginary part |                     |
  |          |            | is 0           |                     |
  ----------------------------------------------------------------