A field descriptor takes one of the following forms:
[r]c
[r]cw
[r]cw.m
[r]cw.d [Ee]
- r
- Is the optional repeat count. If it is omitted, the repeat
count is assumed to be 1.
- c
- Is a format code (I, O, Z, F, E, D,
G, L, or A).
- w
- Is the external field width, in characters. Each
data item in the external medium is called an external field.
- m
- Is the minimum number of characters that must appear within the
field (including leading zeros).
- d
- Is the number of characters to the right of the decimal point.
- E
- In this context, identifies an exponent field.
- e
- Is the number of characters in the exponent.
The terms r, w, m, d,
and e must all be unsigned integer constants
or variable format expressions. The
following table shows the processor ranges for these values:
Term | VAX Range |
Alpha Range |
r | 1
through 32767 (2**15-1) | 1 through 2147483647
(2**31-1) |
w | 1
through 32767 | 1 through 2147483647 |
m | 0 through 255 (2**8-1) |
0 through 32767 (2**15-1) |
d | 0 through 255 | 0 through
32767 |
e | 1 through
255 | 1 through 32767 |
PARAMETER constants cannot be used as values for r,
w, m, d, or e.
The field descriptors are as follows:
- Integer - Iw, Iw.m, Ow, Ow.m, Zw,
Zw.m
- Logical - Lw
- Real and complex - Fw.d, Ew.d, Ew.dEe, Dw.d, Gw.d, Gw.dEe
- Character - Aw
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