Question

1) Which of the following is not a C variable?
a) Count123
b) Count 123
c) Count 123
d) X_123_Count​

Answer 1

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

Explanation:

(b should be Count_123 and c should be Count@123). If the options given are correct, the answer would be options b and c as C doesn't allow Whitespace in Variable names.

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.

Learn more:

What is a variable in C?​

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