Processing: 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.

  

Operators.pde

int var = 10;
println(++var);

Output

11

Post increment

    Syntax:

        variable++

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

Operators.pde

int var = 10;

println(var++);
println(var);

Output

10

11

Pre Decrement

    Syntax:

        --variable

 Pre decrement operator decrements the variable value by 1 immediately.

   

Operators.pde

int var = 10;
println(--var);

Output

9

Post Decrement

    Syntax:

        variable--

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

Operators.pde

int var = 10;
println(var--);
println(var);

Output

10

9

Some more examples

Operators.pde

int var = 10;

int result = var++ + var++ ;
println("value of variable is " + var);
println("Result is " +result);

result = var++ + ++var;
println("value of variable is " + var);
println("Result is " +result);

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

result = --var + var--;
println("value of variable is " + var);
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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