These can be used inside the condition of an if statement. Evaluate to true or false.
&& (logical and)¶True only if both operands are true. For example:
if (digitalRead(2) == HIGH && digitalRead(3) == HIGH) { // read two switches
// ...
}
is true only if both inputs are high. Another example:
if (a >= 10 && a <= 20){} // true if a is between 10 and 20
Be careful not to say 10 <= a <= 20! This won’t work the way you want. You have to separately test whether a is at least 10 using a >= 10, then test whether a is at most 20 using a <= 20, then combine the results using &&.
|| (logical or)¶True if either operand is true. For example:
if (x > 0 || y > 0) {
// ...
}
is true if either x or y is greater than 0.
! (logical not)¶True if the operand is false. For example:
is true if x is false (i.e. if x is zero).
Some Advice¶Warning
Make sure you don’t mistake the boolean AND operator && (double ampersand) for the bitwise AND operator & (single ampersand). They are entirely different beasts.
Similarly, do not confuse the boolean OR operator || (double pipe) with the bitwise OR operator | (single pipe).
The bitwise NOT operator ~ (tilde) looks much different than the boolean not operator ! (exclamation point, or “bang”, as some programmers say), but you still have to be sure which one you want.
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