1. Operand is an entity on which an operation is performed.
2. Operator specifies the operation to be performed on an operand.
3. Expression is made up of operands and operators.
4. Operands constituting an expression can be identifiers, constants or expressions them-
selves. The identifiers allowed to constitute an expression are variables, functions and mac-
ros. However, label names, typedef name, tags of structure, union or enumeration cannot be
a part of an expression. The expressions forming an expression are called sub- expressions.
An expression that is not a part of another expression is called ...
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