Which of the following is NOT a legal variable name?Question 3Answera.my_varb._myvarc.Myvard.my-var

Break Down the Problem

1. Identify the characteristics of legal variable names in programming.
2. Analyze each option to determine if it adheres to these characteristics.

Relevant Concepts

Legal variable names typically must follow these rules:

1. They can include letters (both uppercase and lowercase), digits (0-9), and underscores (_).
2. They cannot start with a digit.
3. They must not contain special characters like hyphens (-).
4. They cannot be a reserved keyword in the programming language.

Analysis and Detail

1. Option a: my_var

   • This is a legal variable name. It uses an underscore and starts with a letter.

2. Option b: _myvar

   • This is also a legal variable name. It starts with an underscore and contains only letters.

3. Option c: Myvard

   • This is a legal variable name. It starts with a letter and contains only letters.

4. Option d: my-var

   • This is NOT a legal variable name. It includes a hyphen (-), which is not allowed in variable names.

Verify and Summarize

Upon reviewing the variable names, options a, b, and c adhere to the rules for legal variable names. However, option d contains a prohibited character.

Final Answer

The variable name that is NOT legal is my-var.