# Bitwise AND Assignment Operator (&=)

Visual Studio 2010

Performs a bitwise AND on the value of a variable and the value of an expression and assigns the result to the variable.

```result &= expression
```

## Arguments

result

Any numeric variable.

expression

Any numeric expression.

## Remarks

Using this operator is almost the same as specifying result = result & expression, except that result is only evaluated once.

The &= operator coerces the arguments to matching data types. Then the &= operator looks at the binary representation of the values of result and expression and does a bitwise AND operation on them.

The output of this operation behaves like this:

```0101    (result)
1100    (expression)
----
0100    (output)
```

Any time both of the expressions have a 1 in a digit, the result has a 1 in that digit. Otherwise, the result has a 0 in that digit.