Question

How to initialize a matrix with random characters in Kotlin

Answer 1

import kotlin.random.Random

const val ROWS = 3
const val COLS = 4

fun printMatrix(matrix: List<List<Char>>) {
    for (row in matrix) {
        for (ch in row) {
            // "%3s" gives right-aligned width of 3
            print(String.format("%3s", ch))
        }
        println()
    }
}

fun getRandomCharacter(): Char {
    val characters = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
    
    return characters[Random.nextInt(characters.length)]
}

fun initializeMatrixWithRandomCharacters(rows: Int, cols: Int): List<List<Char>> {
    return List(rows) {
        List(cols) { getRandomCharacter() }
    }
}

fun main() {
    val matrix = initializeMatrixWithRandomCharacters(ROWS, COLS)
    
    printMatrix(matrix)
}



/*
run:

  x  r  H  M
  n  h  9  Y
  7  w  3  O

*/

 

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