! (logical NOT) Control Logical Operators Web & Application logicalNOT.gif boolean a = false; if (!a) { rect(30, 20, 50, 50); } a = true; if (a) { line(20, 10, 90, 80); line(20, 80, 90, 10); } Inverts the Boolean value of an expression. Returns true if the expression is false and returns false if the expression is true. If the expression (a>b) evaluates to true, then !(a>b) evaluates to false. !expression expression any valid expression || (logical OR) && (logical AND) if() 1.0 Operator PDE