Question

a. Which of the following are invalid variable names and why?
(iii) percent
(iv) 123
(ii) S-num
(0) PaidInterest
(v) dit km
(vi) INPUT
(viii) book$
(vii) END
(ix) ia"
(x) 2ab

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Answer 1

From the given question the correct answer is

1. S-name (other than underscore any other special symbol is not allowed)
2. dit km (space not allowed in  variable)
3. 2ab (must not begin with a digit)
4. book$ (In variable name, no special characters allowed other than underscore (_).)
5. ia"  ( In variable name, no special characters allowed other than underscore (_).)