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Description
The bitwise OR operator in C++ is the vertical bar symbol, |. Like the & operator, | operates independently each bit in its two surrounding integer expressions, but what it does is different (of course). The bitwise OR of two bits is 1 if either or both of the input bits is 1, otherwise it is 0.
In other words:
0 0 1 1 operand1
0 1 0 1 operand2
----------
0 1 1 1 (operand1 | operand2) - returned result
Example Code
int a = 92; // in binary: 0000000001011100
int b = 101; // in binary: 0000000001100101
int c = a | b; // result: 0000000001111101, or 125 in decimal.
One of the most common uses of the Bitwise OR is to set multiple bits in a bit-packed number.
// Note: This code is AVR architecture specific
// set direction bits for pins 2 to 7, leave PD0 and PD1 untouched (xx | 00 == xx)
// same as pinMode(pin, OUTPUT) for pins 2 to 7 on Uno or Nano
DDRD = DDRD | B11111100;
See Also
- Language : << (bitshift left)
- Language : >> (bitshift right)
- Language : & (bitwise and)
- Language : ~ (bitwise not)
- Language : ^ (bitwise xor)
- Language : || Logical OR
- Example : BitMath Tutorial
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| Arduino UNO R3 | |
| Arduino Starter Kit |
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