Instruction 3

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Learning Basic Data Types: Numbers

Types are how we identify different kinds of data from the real world. Kotlin has many different basic types, including integers, floating-point numbers, booleans, characters, and strings. In this lesson, you’ll cover the number types.

Int

In Kotlin, every numeric value is automatically an Int. An Int has a maximum and minimum value of between -2,147,483,648 (-2^31^) and 2,147,483,647 (-2^31^ - 1). If a value exceeds this limit, the variable becomes a Long. A Long is also a whole number but has a higher capacity than an Int. You have already used the Int type in the previous examples. To initialize a Long, append an L to the number:

Floating-point

Floating-point types are numbers with decimals or fractions. Single-precision or decimal numbers holding 32 bits of data, are assigned the Float class type when creating variables. Your program at this point handles the Int type only. This is enforced by toInt():

Double

For higher or double-precision numeric data, use the Double class type. The Double stores 64-bits of numeric data. To initialize a Double, use precision or a decimal point.

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