Question

Which of the following are invalid variable names and why?
a) roll-no or noll_no
b) interest_paid
c) SUM
d) none of these

Answer 1

sum.is the valid name bcoz it starts from capital letter and ends too.....so the right and will be sum....hope it helps u

Answer 2

The invalid variable, from the following are roll-no or noll_no and SUM.

Options (a) and (c)

Explanation: 

• Variable names in programming languages follow some basic and common conventions.

• Variable name should start with a letter,numbers can be included later on.

• Underscores(_) are used for clarity.

• Should not have any special characters.

• There should be no spaces in between.

• Variable name should be meaningful.

• Variable name ideally, should not be a name that is assigned to an inbuilt function or method.

• Here, roll-no has a special character in-between and noll_no does not make any sense. 'SUM' is normally an inbuilt function that gives the sum of two or more numbers. Hence, this should not be used as a variable name.

• interest_paid seems to be the only valid variable name here.

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