Arithmetic Operators: ++, --

++ Increment operator; increments a value by 1

-- Decrement operator; decrements a value by 1

Pre increment

    Syntax:

    ++variable

      pre increment operator increments the variable value by 1 immediately.

  

Example

class PreIncrement{
 public static void main(String args[]){
  int var = 10;
  System.out.println(++var);
 }
}

Output

11

Post increment

    Syntax:

        variable++

    post increment operator increments the variable value by 1 after executing the current statement.

class PostIncrement{
 public static void main(String args[]){
  int var = 10;
  
  System.out.println(var++);
  System.out.println(var);
 }
}

Output

10
11

Pre Decrement

    Syntax:

        --variable

    pre decrement operator decrements the variable value by 1 immediately.

    Example

     

class PreDecrement{
 public static void main(String args[]){
  int var = 10;
  System.out.println(--var);
 }
}

Output

9

Post Decrement

    Syntax:

        variable--

post decrement operator decrements the variable value by 1 after executing the current statement.

class PostIncrement{
 public static void main(String args[]){
  int var = 10;
  System.out.println(var--);
  System.out.println(var);
 }
}

Output

10
9

Some more Examples

Class ArithmeticEx{
 public static void main(String args[]){
  int var = 10;
  
  int result = var++ + var++ ;
  System.out.println("value of variable is " + var);
  System.out.println("Result is " +result);
  
  result = var++ + ++var;
  System.out.println("value of variable is " + var);
  System.out.println("Result is " +result);

  result = var++ + var--;
  System.out.println("value of variable is " + var);
  System.out.println("Result is " +result);

  result = --var + var--;
  System.out.println("value of variable is " + var);
  System.out.println("Result is " +result);
 }
}

Output

value of variable is 12
Result is 21
value of variable is 14
Result is 26
value of variable is 14
Result is 29
value of variable is 12
Result is 26

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