TCPL/A.07.04.1_Prefix_Incrementation_Operators

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A.7.4.1 Prefix Incrementation Operators

A unary expression followed by a ++ or – operator is a unary expression. The operand is incremented ++ or decremented – by 1. The value of the expression is the value after the incrementation (decrementation). The operand must be an lvalue; see the discussion of additive operators (Par.A.7.7) and assignment (Par.A.7.17) for further constraints on the operands and details of the operation. The result is not an lvalue.