can someone help how can i get random math operator ( kotlin)-CodePudding

hello guys am new to kotlin i try to make a quiz app , so the questions that included strings i put them manually and math questions are random ( loop ) the help i ask for how can i get random math operator here

 println("${randomNumber1} * ${randomNumber2}")

also println("${randomNumber1} * ${randomNumber2}")

part from the code :

   try {
            for (i in defaultMain until defaultMain 40) {
                val randomNumber1 = (0..30).random()
                val randomNumber2 = (1..10).random()
                println("${randomNumber1} * ${randomNumber2}")
                var input = readLine()!!.toInt()
                when (input) {
                    randomNumber1 * randomNumber2 -> "Right! 5 Points added to your score , and 5  bonus"
                    else -> lose() }
                this.bonus =  this.bonus   5
                this.score = this.score   5
                this.score = this.score    this.bonus
                println("Your current score: ${this.score}")
            }
        } catch (e : Exception)
        {
            println(e.message)
            exitProcess(0)
        }

CodePudding user response：

define operators in an array like below and access from index by generating random number:

char[] x = { '-', ' ', '*', '/', '^', '%' };
Random random = new Random();
int random_operator = random.nextInt(x.length);
System.out.println(x[random_operator]);

CodePudding user response：

Maybe something like this?

val randomNumber1 = (0..30).random()
val randomNumber2 = (1..10).random()
val operator = (1..4).random()

val solution = when (operator) {
    1 -> {
        println("$randomNumber1 * $randomNumber2")
        randomNumber1 * randomNumber2
    }
    2 -> {
        println("$randomNumber1 / $randomNumber2")
        randomNumber1 / randomNumber2
    }
    3 -> {
        println("$randomNumber1 - $randomNumber2")
        randomNumber1 - randomNumber2
    }
    else -> {
        println("$randomNumber1   $randomNumber2")
        randomNumber1   randomNumber2
    }
}
var input = readLine()!!.toInt()
if (input == solution)
    println("Right! 5 Points added to your score , and 5  bonus")
else
    lose()