import java.util.*
 
fun main(args: Array<String>) {
    val sc = Scanner(System.`in`)
 
}fun main() {
    println("===== Simple Calculator =====")
 
    val num1 = readLine()!!.toDouble()
    val num2 = readLine()!!.toDouble()
    val choice = readLine()!!.toInt()
 
    val result = when(choice) {
        1 -> num1 + num2
        2 -> num1 - num2
        3 -> num1 * num2
        4 -> if(num2 != 0.0) num1 / num2 else "Error: 0 diye bhag kora jabe na"
        else -> "Bhulo option"
    }
 
    println("Folafol = $result")
}

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

ICAgIDEwCiAgICA1CiAgICAx

    10
    5
    1