Augmenting operators

An augmenting operator takes one updatable expression (variable, attribute reference or subscription) and performs an operation on that, returning the expression's old or new value.

Prefix increment operator (++) takes an operand, increments it by one, stores it back, and yields a new (incremented) value.

Prefix decrement operator (--) takes an operand, decreases it by one, stores it back, and yields a new (decremented) value.

Postfix increment operator (++) takes an operand, increments it by one, stores it back, and yields the old value.

Prefix decrement operator (--) takes an operand, decreases it by one, stores it back, and yields the old value.

  augment-expr := "++" assignable-expr 
  augment-expr := "--" assignable-expr 
  augment-expr := assignable-expr "++" 
  augment-expr := assignable-expr "--" 

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