3A. format ---------- An expression is a piece of code held together by operators, functions and parentheses to form a value. They mostly consist of: - immediate values (see 2A ,...) - operators (see 4A ,...) - function calls (see 3D ) - parentheses () (see 3B ) - variables or variable-expressions (see 3C ) examples of expressions: 1 'hello' $ABCD+(2*6)+Abs(a) (a<1) OR (b>=100)