Question

Which of the following is not c variable?
a count123
b count_123
c count@123
d X_123_count

Answer 1

Answer:

Option C : count@123

Explanation:

Among all the four options given, count@123 is not a valid c variable name.

According to programming rules for C language, Variable names in C can be  letters and digits. The underscore character is also allowed but @ character is not allowed in C. It is a special character and it is not used for the purpose of declaring variables

Answer 2

count@123 (Option C) is not considered as a variable in C.

Explanation:

To justify the answer, let us know the basic rules of variable declaration in C.

• Rule 1: A variable can have letters in the English alphabet, digits, and underscore. No other special characters are allowed.

• Rule 2: A variable name cannot be started with a number. It should always start with either a letter or an underscore.

• Rule 3: Whitespace is not allowed within the variable name.

• Rule 4: A variable name should never be any reserved word or keyword

So, as we see above, the third option i.e., count@123 fails to meet the rules of variable declaration (@ is a special character and any special characters other than an underscore are not allowed in C for variable declaration).

Therefore, count@123 (Option C) is not considered as a variable in C.

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