Kotlin dec to hex

Saved searches

Use saved searches to filter your results more quickly

You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session. You switched accounts on another tab or window. Reload to refresh your session.

Kotlin library to handle hexadecimal value representations

License

komputing/KHex

This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.

Name already in use

A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. Are you sure you want to create this branch?

Sign In Required

Please sign in to use Codespaces.

Launching GitHub Desktop

If nothing happens, download GitHub Desktop and try again.

Launching GitHub Desktop

If nothing happens, download GitHub Desktop and try again.

Launching Xcode

If nothing happens, download Xcode and try again.

Launching Visual Studio Code

Your codespace will open once ready.

There was a problem preparing your codespace, please try again.

Latest commit

Git stats

Files

Failed to load latest commit information.

README.md

KHex is a Kotlin multiplatform library to deal with hexadecimal encoding and decoding.

It was incubated as part of KEthereum but then extracted as it can be useful outside this context.

This library is available through GitHub Packages.

In order to use it, first include the GitHub Packages maven repository inside your project build.gradle.kts file:

repositories < maven < name = "komputing/KHex GitHub Packages" url = uri("https://maven.pkg.github.com/komputing/KHex") credentials < username = "token" password = "\u0039\u0032\u0037\u0034\u0031\u0064\u0038\u0033\u0064\u0036\u0039\u0061\u0063\u0061\u0066\u0031\u0062\u0034\u0061\u0030\u0034\u0035\u0033\u0061\u0063\u0032\u0036\u0038\u0036\u0062\u0036\u0032\u0035\u0065\u0034\u0061\u0065\u0034\u0032\u0062" > > >

When ‘username’ could be anything and ‘password’ is an encoded access token for public access.

This library is available on Jitpack. The current version is:

In order to use it, first include the Jitpack maven repository inside your project build.gradle file:

repositories < maven < url="https://jitpack.io" > >

Include the modules inside your project:

dependencies < implementation("com.github.komputing.khex::") >

Where can be either a release or -SNAPSHOT such as master-SNAPHOT .

You can use the functions contained inside this library in order to encode or decode any hexadecimal value.

// Encoding val myByteValue = 31.toByte() encode(myByteValue) val myByteArrayValue = byteArrayOf(31, 32 , 33) encode(myByteArrayValue) // Decoding val myHexString = "0xaa12456789bb" decode(myHexString)

By including the extensions module, you will be able to access a list of extensions functions that can be useful when working with strings and byte arrays/lists.

// ByteArray byteArrayOf(1, 2, 3).toHexString(prefix = "0x") byteArrayOf(1, 2, 3).toNoPrefixHexString() // List listOf(1.toByte(), 2.toByte()).toHexString(prefix = "0x") listOf(1.toByte(), 2.toByte()).toNoPrefixHexString() // StringHexString("0xaa12456789bb").hexToByteArray() HexString("0xaa12456789bb").has0xPrefix() HexString("aa12456789bb").prepend0xPrefix() HexString("0xaa12456789bb").clean0xPrefix()

Источник

How to convert Int to Hex String in Kotlin?

Solution 1: You can still use the Java conversion by calling the static function on : And, starting with Kotlin 1.1, there is a function in the Kotlin standard library that does the conversion, too: Note, however, that this will still be different from , because the latter performs the unsigned conversion: But with experimental Kotlin unsigned types, it is now possible to get the same result from negative number unsigned conversion as with : Solution 2: You can simply do it like this: Solution 3: If you need to add zero before bytes which less than 10(hex), for example you need string — «0E» then use: Question: i’m still new to kotlin so take my question with a grain of salt so i’ve made an example that hopefully will help people hope this helped someone Question: I am working on a console application in Kotlin where I accept multiple arguments in function I want to check whether the is a valid integer and convert the same or else I have to throw some exception.

How to convert Int to Hex String in Kotlin?

I’m looking for a similar function to Java’s Integer.toHexString() in Kotlin. Is there something built-in, or we have to manually write a function to convert Int to String ?

You can still use the Java conversion by calling the static function on java.lang.Integer :

val hexString = java.lang.Integer.toHexString(i) 

And, starting with Kotlin 1.1, there is a function in the Kotlin standard library that does the conversion, too:

fun Int.toString(radix: Int): String

Returns a string representation of this Int value in the specified radix .

Note, however, that this will still be different from Integer.toHexString() , because the latter performs the unsigned conversion:

println((-50).toString(16)) // -32 println(Integer.toHexString(-50)) // ffffffce 

But with experimental Kotlin unsigned types, it is now possible to get the same result from negative number unsigned conversion as with Integer.toHexString(-50) :

println((-50).toUInt().toString(16)) // ffffffce 

You can simply do it like this: «%x».format(1234)

If you need to add zero before bytes which less than 10(hex), for example you need string — «0E» then use: «%02x».format(14)

Best Way to Convert ArrayList to String in Kotlin, Kotlin as well has method for that, its called joinToString.. You can simply call it like this: list.joinToString()); Because by default it uses comma as separator but you can also pass your own separator as parameter, this method takes quite a few parameters aside from separator, which allow to do a lot of …

Kotlin: why would you want to convert Int.toString?

i’m still new to kotlin so take my question with a grain of salt

so i’ve been learning about kotlin and in one of the articles i was reading about had this code as an example of how to use .toString

val sum1 = < a: Int, b: Int ->val num = a + b num.toString() //convert Integer to String > fun main(args: Array)

The sum of two numbers is: 5 

as i understand it, it’s a «5» but of type string.. but why??

we can just simplify the code and get the same outcome:

 val sum1 = < a: Int, b: Int ->a + b > val result1 = sum1(2,3) println("The sum of two numbers is: $result1") 

The sum of two numbers is: 5 

so.. i’ve seen examples of how to use it, but i still didn’t find anything to explain why you’d want to use it

.toString() returns a string representation of the object. It is not just restricted to converting Int to String . You can use it to convert other data type like Boolean to String .

So whenever a a developer need to store Int as a String , he/she can cast Int to String with the help of .toString() .

The above code snippet shared by you is way generic, hence you got confused.

To summarize, whenever you want to store/map any data-type into String, then use .toString() .

everyone talking about «how you can use it» but still no one saying «why you’d want to use it»

so i’ve made an example that hopefully will help people

fun main() < inference() >fun inference() < val sum1 = < a: Int, b: Int ->val num = a + b // convert Integer to String num.toString() > val result1 = sum1(2, 3) println("The sum of the two numbers is: $result1") // compiler error: can't use "result1" because it's a String and not an Int //val result2 = sum1(result1, 3) // let's say your code only takes strings but you want to insert an Int val sum2 = val str = a + b str > var int: Int? = 10 //int = null // uncomment this line to get the other outcome if(int != null) < val result3 = sum2("the number we got is: ", int.toString()) println(result3) >else < val result4 = sum2("we did not get any number, ", " check if int is null") println(result4) >> 

Convert String obtained from edittext to Integer in Kotlin, You can use .toInt (): val myNumber: Int = «25».toInt () Note that it throws a NumberFormatException if the content of the String is not a valid integer. If you don’t like this behavior, you can use .toIntOrNull () instead (since Kotlin 1.1):

How to convert String to Int in Kotlin?

I am working on a console application in Kotlin where I accept multiple arguments in main() function

I want to check whether the String is a valid integer and convert the same or else I have to throw some exception.

You could call toInt() on your String instances:

fun main(args: Array) < for (str in args) < try < val parsedInt = str.toInt() println("The parsed int is $parsedInt") >catch (nfe: NumberFormatException) < // not a valid int >> > 

Or toIntOrNull() as an alternative:

If you don’t care about the invalid values, then you could combine toIntOrNull() with the safe call operator and a scope function, for example:

Actually, there are several ways:

var numberString : String = "numberString" // number is the int value of numberString (if any) var defaultValue : Int = defaultValue 

Operation	Numeric value	Non-numeric value
numberString.toInt()	number	NumberFormatException
numberString.toIntOrNull()	number	null
numberString.toIntOrNull() ?: defaultValue	number	defaultValue

If numberString is a valid integer, we get number , else see a result in column Non-numeric value .

Keep in mind that the result is nullable as the name suggests.

As suggested above, use toIntOrNull() .

Parses the string as an [Int] number and returns the result or null if the string is not a valid representation of a number.

val a = "11".toIntOrNull() // 11 val b = "-11".toIntOrNull() // -11 val c = "11.7".toIntOrNull() // null val d = "11.0".toIntOrNull() // null val e = "abc".toIntOrNull() // null val f = null?.toIntOrNull() // null 

Convert Long to String in Kotlin, Format in Kotlin string templates. 219. How to convert List to Map in Kotlin? 497. Converting int values in Java to human readable strings more hot questions Question feed Subscribe to RSS Question feed To subscribe to this RSS feed, copy and paste this URL into your RSS reader.

Kotlin String to Int or zero (default value)

How can I covert String to Int in Kotlin and if it can’t be then return 0 (default value).

I think the best solution is to tell value is Int and use Elvis operator to assign value 0 if it can’t be converted.

val a:String="22" val b:Int = a.toIntOrNull()?:0//22 val c:String="a" val d:Int = c.toIntOrNull()?:0//0 

To make code more concise you can create Extension Function

fun String?.toIntOrDefault(default: Int = 0): Int

Java — Extract numbers from a string kotlin, For some cases like if the text contains formatted amount, then the above answers might fail. For example, if the text is «Rs. 1,00,000.00» and if we only filter . and digit, then the output we get is .100000.00 this will be a wrong amount.So better first extract the string between digits and then filter for digit …

Источник

How to convert Int to Hex String in Kotlin?

I’m looking for a similar function to Java’s Integer.toHexString() in Kotlin. Is there something built-in, or we have to manually write a function to convert Int to String ?

Numbers Solutions

Solution 1 — Numbers

You can still use the Java conversion by calling the static function on java.lang.Integer :

val hexString = java.lang.Integer.toHexString(i) 

And, starting with Kotlin 1.1, there is a function in the Kotlin standard library that does the conversion, too:

> fun Int.toString(radix: Int): String > > Returns a string representation of this Int value in the specified radix .

Note, however, that this will still be different from Integer.toHexString() , because the latter performs the unsigned conversion:

println((-50).toString(16)) // -32 println(Integer.toHexString(-50)) // ffffffce 

But with experimental Kotlin unsigned types, it is now possible to get the same result from negative number unsigned conversion as with Integer.toHexString(-50) :

println((-50).toUInt().toString(16)) // ffffffce 

Solution 2 — Numbers

You can simply do it like this: «%x».format(1234)

Solution 3 — Numbers

If you need to add zero before bytes which less than 10(hex), for example you need string — «0E» then use: «%02x».format(14)

Источник