HP 3000 Manuals HP 3000 Manuals
PACKFMT
The PACKFMT statement is a list of variables that are to be packed or
unpacked by the PACK and UNPACK statements. You can also specify the
number of characters to be skipped between data values.
Syntax
PACKFMT [REALV] pack_item [, pack_item]...
Parameters
REALV The default real data type in a native mode program is
an IEEE floating point real format. Therefore, you must
specify "REALV" in the PACKFMT statement if the MPE V
real data format is desired. The keyword, "REALV" will
be ignored on MPE V.
pack_item One of the following:
* Scalar numeric variable.
* Scalar string variable.
* Substring.
* String or numeric array.
* Space specifier: SKIP number.
* String or numeric literal.
* Numeric literal type converted with one of the
following built in functions:
SINTEGER
INTEGER
SREAL
REAL
SDECIMAL
DECIMAL
where number is a positive short integer numeric
constant that specifies the number of characters
skipped. The skip feature is used to bypass unneeded
data in a data set. For the PACK USING and UNPACK USING
statements, that number of characters (bytes) are
skipped in the specified str_var. For the DBGET USING,
DBPUT USING and DBUPDATE USING statements that number of
characters is skipped in the implicit str_var. In both
cases, use of this option can save time when accessing a
subset of the variables in a data set.
Examples
The following example shows the PACKFMT statement. It declares the
variables, and then specifies three PACKFMT statements.
100 INTEGER Number,Times(4)
110 DIM String$[10],A$[10]
120 PACKFMT Number,String$,A$[6],Times(*)
130 PACKFMT Times(*),SKIP 2,String$,SKIP 5,Number,SKIP 1,A$[1;5]
140 PACKFMT 2, INTEGER(7.2),"wow"