CSE 3901 Final Exam WITH CORRECT ANSWERS

CSE 3901 Final Exam WITH CORRECT |\ |\ |\ |\ |\ |\




ANSWERS


in ruby, objects... - CORRECT ANSWERS ✔✔have types, but
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variables don't |\




ruby is an interpreted program, list advantages and
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disadvantages - CORRECT ANSWERS ✔✔Advantages |\ |\ |\ |\




- platform independence
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- read-eval-print loop
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- reflection
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Disads
- speed
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- later error detection at run time
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List examples of number literals in Ruby - CORRECT ANSWERS
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✔✔83, 0123, 0x53, 0b1010011, 0b101_0011, 123.45, 1.2345e2,
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2/3r


string literals in ruby - CORRECT ANSWERS ✔✔" " and ' ' are
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delimeters, interpolation of #{ } occurs inside " " |\ |\ |\ |\ |\ |\ |\ |\




%Q" ... " custom delimeters or q
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ranges in ruby... - CORRECT ANSWERS ✔✔0..4 is end inclusive (0,
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1, 2, 3, 4)
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,0...4 is end exclusive (0, 1, 2, 3)
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single line comment in Ruby, multi line looks... - CORRECT
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ANSWERS ✔✔#This is a comment |\ |\ |\ |\




=begin
...comment
=end


what does ** do? what about %? - CORRECT ANSWERS ✔✔power
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so 2**2 is 2 squared
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% is modulus not remainder
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difference between 1/3r / 1/2r and (1/3r) / (1/2r)... - CORRECT
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ANSWERS ✔✔first one is 1/6r since it is basically (1/3r)/2r and the
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second one is 2/3r actual division
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what is <=>? - CORRECT ANSWERS ✔✔spaceship
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operator...returns -1/0/1 if LHS is smaller/equal/larger than RHS |\ |\ |\ |\ |\ |\ |\




what is self and nil? - CORRECT ANSWERS ✔✔self is the receiver
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of the current method and nil is nothingness
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nil evaluates to... - CORRECT ANSWERS ✔✔false
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, local variables start with - CORRECT ANSWERS ✔✔lowercase or _
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global variables start with... - CORRECT ANSWERS ✔✔$
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instances start with... - CORRECT ANSWERS ✔✔@ |\ |\ |\ |\ |\ |\




class variables start with... - CORRECT ANSWERS ✔✔@@
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conditional syntax in ruby... - CORRECT ANSWERS ✔✔if-elsif-else- |\ |\ |\ |\ |\ |\ |\


end


basic iteration syntax - CORRECT ANSWERS ✔✔while (condition)
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do...
until (condition) do... |\ |\




begin i = i+1 end while i < max |\ |\ |\ |\ |\ |\ |\ |\




keyword def for definition |\ |\ |\




- no types for parameters
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- no return type
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all functions return something
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def foo(x, y) |\ |\




|\ x + y (last statement is returned)
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end - CORRECT ANSWERS ✔✔
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