Differentiate Concrete data type and abstract datatype.

Which strategy is used for program designing? Define that Strategy.

Identify Which of the following are constructors and selectors?
(a) N1:=number()
(b) accetnum (n1)
(c) displaynum (n1)
(d) eval (a/b)
(e) x,y:= make slope (m), make slope (n)
(f) display()

What are the different ways to access the elements of a list. Give example.

Identify Which of the following are List, Tuple and class ?
(a) arr [1, 2, 34]
(b) arr (1, 2, 34)
(c) student [rno, name, mark]
(d) day= (‘sun’, ‘mon’, ‘tue’, ‘wed’)
(e) x= [2, 5, 6.5, [5, 6], 8.2]
(f) employee [eno, ename, esal, eaddress]