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# log_exp - EQUIV

Other versions: 7.31 | 7.40 | 7.54

## Syntax

``````
... log_exp1 EQUIV log_exp2 ...
``````

### Effect

Joining two logical expressions `log_exp` with `EQUIV` produces a new logical expression which is true if both expressions are true or both expressions are false. If one of the expressions is true and the other one is false, the join is false.

Within a bracketing level, only two logical expressions can be joined using `EQUIV`.

Notes

• The operator `EQUIV` has a weaker join effect than `NOT`, `AND`, and `OR`.

• The operator `EQUIV` implements an equivalence join. Negating a join like this using `NOT` corresponds to an XOR join (eXclusive OR). It is true if one of the expressions is true and the other one is false.

Example

The condition in the `IF` statement is true if `o1`, `o2`, and `o3`, `o4` are pair-wise either both equal or both unequal.

``````DATA: o1 TYPE i,
o2 TYPE i,
o3 TYPE i,
o4 TYPE i.

...

IF o1 = o2 EQUIV o3 = o4.
...
ENDIF.
``````