Basic Types

Integer Types

Int is the default type for whole numbers and holds values up to about 2.1 billion. Long holds much larger whole numbers but literals must end with an L suffix, such as 10000000000L.

Example: Integer Types

fun main() {
    val small: Int = 42
    val big: Long = 10000000000L
    println("Int: $small, Long: $big")
}

Floating-Point Types

Double is the default type for decimal numbers with high precision, while Float uses less memory but less precision and requires an f suffix on its literals.

Example: Floating-Point Types

fun main() {
    val pi: Double = 3.14159
    val ratio: Float = 1.5f
    println("Double: $pi, Float: $ratio")
}

Boolean and Char

Boolean can only be true or false, commonly used in conditions. Char holds exactly one character wrapped in single quotes, distinct from a String, which uses double quotes.

Example: Boolean and Char

fun main() {
    val isKotlinFun: Boolean = true
    val grade: Char = 'A'
    println("Fun: $isKotlinFun, Grade: $grade")
}

Integer Division Truncates

Dividing two Int values with / performs integer division, discarding any remainder rather than rounding. To get a fractional result, at least one operand must be a Double or Float.

Note: Use the % operator to get the remainder of an integer division.

Example: Integer Division Truncates

fun main() {
    val a = 7
    val b = 2
    println("Integer division: ${a / b}")
    println("Double division: ${a / b.toDouble()}")
}