Which are valid declarations? (Choose all that apply)

technology programming languages

  1. int $x

  2. int 123

  3. int _123

  4. int #dim

  5. int %percent

  6. int central_sales_region_Summer_2005_gross_sales

Show answer
Correct Option: A,C,F

AI Explanation

To determine the valid declarations, let's go through each option:

Option A) int $x - This option is a valid declaration. In programming languages like C or C++, variable names can start with an underscore (_) or a letter. Therefore, the variable name "$x" is valid.

Option B) int 123 - This option is not a valid declaration. Variable names cannot start with a number.

Option C) int 123 - This option is a valid declaration. Variable names can start with an underscore (), so "_123" is a valid variable name.

Option D) int #dim - This option is not a valid declaration. Variable names cannot start with special characters like "#" in most programming languages.

Option E) int %percent - This option is not a valid declaration. Variable names cannot start with special characters like "%" in most programming languages.

Option F) int central_sales_region_Summer_2005_gross_sales - This option is a valid declaration. Variable names can contain letters, numbers, and underscores. Therefore, "central_sales_region_Summer_2005_gross_sales" is a valid variable name.

The correct options are A, C, and F.

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