--

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
Send
x = 1 y = 1
Autoscroll Show timestamp
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
Send
x = 1 y = 2
Autoscroll Show timestamp
Clear output
9600 baud  
Newline  

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