Variable declaration %{use $parameter}% %{var $i, $j}% Assigments and expressions Assignments: =, +=, -=, *=, >=, /=, %= Arithmetic operators: +, -, \*, /, % Comparison operators: ==, ===, !=, !==, <, >, <=, >= Logical operators: ||, &&, ! increment, decrement: $v++, $v--, ++$v, --$v *Note:* Assignments cannot be used inside an expression: %{if $a = 2}%