| Free-Form Syntax | (not allowed - use the EVAL operation code) |
| Code | Factor 1 | Factor 2 | Result Field | Indicators | ||
|---|---|---|---|---|---|---|
| Z-SUB (H) | Subtrahend | Difference | + | - | Z | |
Factor 2 is subtracted from a field of zeros. The difference, which is the negative of factor 2, is placed in the result field. You can use the operation to change the sign of a field. Factor 1 is not used. Factor 2 must be numeric and can contain one of the following: an array, array element, field, figurative constant, literal, named constant, subfield, or table name.
The result field must be numeric, and can contain one of the following: an array, array element, field, subfield, or table name.
Half-adjust can be specified.
For the rules for the Z-SUB operation, see Arithmetic Operations.
See Figure 172 for an example of the Z-SUB operation.