Data Types and Variables : MCQs & PYQs with Explanation

Option D

Java naming convention is a mechanism to follow as you decide what to name your identifiers such as class, package, variable, constant, method, etc.
Rules For Writing Variable Name:

• It can contain letters, digits, underscore (_), and dollar sign ($).
• It cannot start with a digit.
• It cannot contain special characters like, - @ # % & * ! space.
• It cannot be a Java keyword (Reserve Word).

The variable name rate-of-taxi contains hyphens (-), which Java treats as subtraction operators and it is invalid variable name.

Option D

In Java, the size of each primitive data type is fixed, regardless of the operating system or machine architecture. The int data type always occupies 32 bits (4 bytes) of memory. This consistency is a key feature of Java Portability across different platforms.