Convert a decimal number to binary in Kotlin

This article explores different ways to convert a decimal number to binary in Kotlin.

A simple solution to get the binary representation of an integer in string format is using the toBinaryString() function from the Integer class.

fun main() {

val n: Int = 75

val binary: String = Integer.toBinaryString(n)

println(binary) // 1001011

}

The Int.toString() function also returns the string representation of a non-negative integer in the specified radix. We can use it as:

fun main() {

val n = 75

val binary = n.toString(2)

println(binary) // 1001011

}

Alternately, we can use the Long.toBinaryString() function for long value.

fun main() {

val n: Long = 75

val binary: String = java.lang.Long.toBinaryString(n)

println(binary) // 1001011

}

Finally, we can write custom logic to convert an integer to binary format, as shown below:

fun toBinary(n: Int): String {

return if (n != 0) toBinary(n / 2) + n % 2 else { "" }

}

fun main() {

val n = 75

val binary = toBinary(n)

println(binary) // 00000000000000000000000001001011

}

That’s all about converting a decimal number to binary in Kotlin.