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COMPUTE (COMP) and COMPUTE.FROM (CMP, CF)
COMPUTE (COMP) and COMPUTE.FROM (CMP, CF)
Syntax
The COMPUTE; and COMPUTE.FROM; commands enable the entry of free-form
expressions involving arithmetic operations and data items.
The result of the calculation is stored in a numeric data item.
$ For the COMPUTE; command, the data item is named as part of the command.
$ For the COMPUTE.FROM; command, the data item must be a Setup Data item, defined
immediately before the COMPUTE.FROM; command.
Note: The COMPUTE.FROM; command is not implemented in LDA Run
Time.
Calculations are performed in the standard mathematical order of precedence for
arithmetic operators, and from left to right.
When using the COMPUTE; and COMPUTE.FROM; commands:
$ The System Data item GLB.STATUS is not affected by either of these commands. Use
the GLB.STATUS; command (in LDA, the GS; command) to test for a divisor of zero or
arithmetic overflow. If either occurs, the result is set to zero. (You could include logic
to test for a divisor of zero before the COMPUTE; or COMPUTE.FROM; commands are
executed.)
$ A maximum of fifteen operands may be used in a COMPUTE; command.
In LDA, the maximum is 98 operators and 99 operands.
$ Data items and operators in the COMPUTE; or COMPUTE.FROM; command must be
separated by at least one space.
$ If the receiving data item in a COMPUTE; or COMPUTE.FROM; command does not
allow sufficient decimal places for precision, the result will be truncated (rather than
rounded).
$ In host LINC, if you do not use the GLB.STATUS; command in your arithmetic logic
and you divide by zero, your program will abort.
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3
DDDDD DD DDY
ZDDDD?
ZDDDDDDDDDDDY @DDDDDDDDDDDDD?
3 3
DDDDDDDADDD DD DDAD DDDDDDD4
data item
A previously defined data item into which the result is to be placed.
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