8.1 Discuss adding ++ and -- operators to Clite. Assume they are allowed only as

Question

8.1 Discuss adding ++ and -- operators to Clite. Assume they are allowed only as free-standing statements.
(a) Discuss the changes required to the type checker and type transformer.
(b) Add new rules for statements that define the semantics of these operators.
(c) Modify the Clite D interpreter to implement these new statements.
(d) Discuss why we do not add these operators to expressions in general.

8.3 Discuss the advantages and disadvantaged of disallowing assignments statements of the form b = a, where a has the value undef. What changes would you have to make to the Clite semantic rules and interpreter to enforce this change?

8.6 Modify the Clite interpreter so that the current state is displayed immediately before each statement is executed. Extra credit: include the statement number in the trace.

Explanation / Answer

++ is an increment operator. By using thi operator we can add 1 to the value. we can use this in 2 ways. if x is a variable, then x++ and ++x clearly i can show the diffference, if y=++x,then this is equal to x=x+1; y=x; if y=x++,then this is equal to y=x; x=x+1; --is a decrement operator, which can reduce 1 from the value. the operations are similar to the increement operator.

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