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Logical NOT in Arduino
Logical NOT is performed using the ! operator. The truth table is given below −
| Expression | Output |
|---|---|
| T | F |
| F | T |
As you can see, the logical NOT inverts the truth value of the expression.
Example
The usage can be understood from the example given below −
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
Serial.println();
int i = 10;
if (!(i > 10)) {
Serial.println("i is NOT greater than 10");
}
else {
Serial.println("i is greater than 10");
}
}
void loop() {
// put your main code here, to run repeatedly:
}Output
The Serial Monitor output is shown below −
The NOT function is often used while waiting for something to become true.
while(!condition){
//do something
}For example, if you are waiting for Serial input,
while(!Serial.available()){
//Wait
}The above loop will break when Serial.available() returns something greater than 0, i.e., when the serial input is received.
Updated on: 31-May-2021
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