Question

Which of the following is not a C variable?

a)  Count123

 

b)  Count_123

 

c)  Count@123

 

d)  X_123_Count

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Answer 1

The one that is not a C variable is :

c) Count@123

• Variables are locations in memory where some kind of data is stored.

• There are many data types of C variables like int, float, char etc.

• There are some rules for defining data types in C. They are :

1. The name of a variable should always begin with a letter or underscore.
2. They can be a combination of digits and letters.
3. In defining a variable no special symbols are allowed other than underscore.

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.

Learn more:

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