What data type stores whole numbers?

• A. Immutability
• B. Integer
• C. Index
• D. Instance

Answer: (B)

Whole numbers are stored using the integer data type. An integer represents numbers without any fractional part, such as 0, 5, or -12. It’s the go-to type for counting items, loop counters, and indices because it handles whole values efficiently. Integers can come in different sizes (like 8, 16, 32, or 64 bits) and can be signed (allow negative values) or unsigned (non-negative), depending on the language.

The other terms describe concepts rather than a numeric type: immutability is about whether a value can be changed after creation; an index refers to a position within a collection; and an instance is an object created from a class. Since they don’t denote a numeric type used to store whole numbers, they’re not appropriate here.

So, the data type that stores whole numbers is the integer.