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Bitwise XOR in Arduino
Just like other bitwise operators, bitwise XOR also applies on the corresponding bits individually.
The operator is ^ and the syntax is,
a ^ b
where a and b are the two numbers to be XORed.
The truth table for XOR is given below −
| P | Q | P^Q |
|---|---|---|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 0 |
As you can see, the XOR operator returns 1 only when the two bits are different.
If you perform 10 ^ 3, this is the computation that will happen at the bit level (assuming your board represents integers using 16 bits)
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 0 | 10 | |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 3 | |
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | 10 ^ 3 = 9 |
Example
Let’s verify this on the Serial Monitor. The code is given below −
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
Serial.println();
int a = 10;
int b = 3;
Serial.println(a ^ b);
}
void loop() {
// put your main code here, to run repeatedly:
}Output
The Serial Monitor output is shown below −
As you can see, the output is exactly as expected.
Updated on: 31-May-2021
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