Expressions and Assignment Statements
Written on 18.30 by Unknown
We meet yet again through my blog and this time I'm gonna talk about my seventh assignment from Mr. Tri Djoko Wahjono, Ir, M.Sc. It is about "Expressions and Assignment Statements", the seventh chapter from Sebesta's Programming Language Concepts book, so i answered 5 questions from the review questions and 5 questions from the problem sets. So here is my answer for them :
Review Questions:
1. Define operator precedence and operator
associativity.
·
Operator precedence: defines order and
priority of the operator evaluation from different precedence levels.
·
Operator associativity: defines the order of operators’
evaluation when it is form the same precedence level.
2. What is a ternary operator?
·
Ternary operator is conditional expressions
that can be used where any other expression can be used.
3. What is a prefix operator?
·
Prefix operator is an operator that precede
their operands
4. What operator usually has right associativity?
·
Operator that usually has right associativity
are operator which can be found in Fortran and Ruby.
5. What is a non-associative operator?
·
Non-associative operator means that the
expression is illegal.
Problem set:
1. When might you want the compiler to ignore type
differences in an expression?
·
Let Type is a sub-range of Integer. It may be
useful for the difference between Type and Integer to be ignored by the
compiler in an expression.
2. State your own arguments for and against
allowing mixed-mode arithmetic expressions.
·
For : A mixed mode arithmetic expression is
needed in calculating expressions that might have decimal results. It is
compulsory as it allows two different type of number data type such as float
and integer to be summed without losing the precision of the float.
·
Against : While it is compulsory to have
mixed-mode expressions, it is more error prone when expressions made are more
likely to have non-decimal results. A mixed mode might produce a decimal result
even though the result wanted is a non-decimal.
3. Do you think the elimination of overloaded
operators in your favorite language would be beneficial? , Why or why not?
·
No, it would not be beneficial. Overloading
operator would be a helpful feature in developing a complex program with
complex arithmetic operation as well. It allows developers to create a class which
function can replace countless lines of codes with an operator. This clearly
will help a readability and writability of a program. Eliminating overloaded
operators would null this advantage.
4. Would it be a good idea to eliminate all
operator precedence rules and require parentheses to show the desired
precedence in expressions? Why or why not?
·
No, it would not be a good idea. Although this
custom precedence sounds like increasing flexibility, requiring parentheses to
show a custom precedence would impact in readability and writability of a
program.
5. Should C’s assigning operations (for example,
+=) be included in other languages (that do not already have them)? Why or why
not?
·
Yes, because it’s simpler than the normal
<operand> = <operand> + <some values> form, and it can save
much time.
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