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7.4.13 |= Operator

Used to perform a bitwise OR on an expression
 

Syntax

result |= expression

Arguments

result
Any variable.
expression
Any expression

Remarks

Using this operator is exactly the same as specifying:
 

result = result | expression

The |= operator looks at the binary representation of the values of result and expression and does a bitwise OR operation on them. The output of this operation behaves like this:
 

0101 (result)

1100 (expression)

----

1101 (output)

Any time either result or expression have a 1 in a digit, result will have a 1 in that digit, otherwise result will have a 0 in that digit.
 
For information on when a run-time error is generated by the |= operator, see the Operator Behavior table.
 

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