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Most operators are binary operators; that is, they have two
operands. In C, those two operands are found on the immediate left and
immediate right of the operator. Some operators, such as the
negation operator, -, and
unary plus, +, have just one operand, found on the immediate right
of the operator. Such operators are unary operators.
You can always determine whether the - and + denote unary or
binary operators by looking to see whether there is any constant, variable,
or subexpression to the immediate left. If there is, then - denotes
subtraction and + denotes addition; otherwise, - denotes
negation and + is handled as though it were not there at all.