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Description
Decrements the value of a variable by 1.
Syntax
x--; // decrement x by one and returns the old value of x
--x; // decrement x by one and returns the new value of x
Parameter Values
- x: variable. Allowed data types: int, long (possibly unsigned).
Return Values
- The original or newly decremented value of the variable.
Example Code
Example 1
void setup() {
Serial.begin(9600);
int x = 2;
int y = --x; // x contains 1, y contains 1
Serial.print("x = ");
Serial.println(x);
Serial.print("y = ");
Serial.println(y);
}
void loop() {
}
The result on Serial Monitor:
COM6
x = 1
y = 1
Autoscroll
Clear output
9600 baud
Newline
Example 2
void setup() {
Serial.begin(9600);
int x = 2;
int y = x--; // x contains 1, but y still contains 2
Serial.print("x = ");
Serial.println(x);
Serial.print("y = ");
Serial.println(y);
}
void loop() {
}
The result on Serial Monitor:
COM6
x = 1
y = 2
Autoscroll
Clear output
9600 baud
Newline
See Also
- Language : += (compound addition)
- Language : &= (compound bitwise and)
- Language : |= (compound bitwise or)
- Language : ^= (compound bitwise xor)
- Language : /= (compound division)
- Language : *= (compound multiplication)
- Language : %= (compound remainder)
- Language : -= (compound subtraction)
- Language : ++ (increment)
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