The op= Use of Bitwise Operators - C Operator

C examples for Operator:Bit Operator

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Introduction

You can use all of the binary bitwise operators in the op= form of assignment.

The exception is the operator ~, which is a unary operator. 

lhs op= rhs;

is equivalent to the statement: 

lhs = lhs op (rhs);

This means that if you write: 

value <<= 4;

the effect is to shift the contents of the integer variable, value, left four bit positions.

It's exactly the same as the following: 

value = value << 4;

You can do the same kind of thing with the other binary operators.

For example, you could write the following statement: 

value &= 0xFF;

where value is an integer variable. This is equivalent to the following: 

value = value & 0xFF;

The effect of this is to keep the rightmost eight bits unchanged and to set all the others to 0.


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