Computer Science
Evaluate the following for each expression that is successfully evaluated, determine its value and type for unsuccessful expression, state the reason.
(a) len("hello") == 25/5 or 20/10
(b) 3 < 5 or 50/(5 - (3 + 2))
(c) 50/(5 - (3 + 2)) or 3 < 5
(d) 2 * (2 * (len("01")))
Answer
(a) len("hello") == 25/5 or 20/10
⇒ 5 == 25/5 or 20/10
⇒ 5 == 5 or 2
⇒ True or 2
⇒ True
The type of result is Boolean.
(b) 3 < 5 or 50/(5 - (3 + 2))
⇒ True or 50/(5 - (3 + 2)) [∵ first operand is True, second operand is not evaluated so no division by 0 error happens]
⇒ True
The type of result is Boolean.
(c) 50/(5 - (3 + 2)) or 3 < 5
⇒ 50/(5 - 5) or 3 < 5
⇒ 50/0 or 3 < 5
⇒ Division by Zero Error
As the denominator of or operator's first operand is 0, Division by Zero error occurs.
(d) 2 * (2 * (len("01")))
⇒ 2 * (2 * 2)
⇒ 2 * 4
⇒ 8
The type of result is Integer.
Related Questions
Write an expression that uses exactly 3 arithmetic operators with integer literals and produces result as 99.
Evaluate and Justify:
(a) 0 or None and "or"
(b) 1 or None and 'a' or 'b'
(c) False and 23
(d) 23 and False
(e) not (1 == 1 and 0 != 1)
(f) "abc" == "Abc" and not (2 == 3 or 3 == 4)
(g) False and 1 == 1 or not True or 1 == 1 and False or 0 == 0
Evaluate and Justify:
(i) false and None
(ii) 0 and None
(iii) True and None
(iv) None and None
Add parentheses to the following expression to make the order of evaluation more clear.
y % 4 == 0 and y % 100 != 0 or y % 400 == 0