16:T681, fun add(a: Int, b: Int): Int { if (a < 0 || b < 0) { throw IllegalArgumentException("Both numbers must be positive") } return a + b } fun subtract(a: Int, b: Int): Int { if (a < 0 || b < 0) { throw IllegalArgumentException("Both numbers must be positive") } return a - b } fun multiply(a: Int, b: Int): Int { if (a < 0 || b < 0) { throw IllegalArgumentException("Both numbers must be positive") } return a * b } fun divide(a: Int, b: Int): Int { if (a < 0 || b < 0) { throw IllegalArgumentException("Both numbers must be positive") } if (b == 0) { throw ArithmeticException("Cannot divide by zero") } return a / b } fun main() { println("Simple Calculator") println("1. Add") println("2. Subtract") println("3. Multiply") println("4. Divide") print("Enter your choice (1-4): ") val choice = readLine()?.toIntOrNull() ?: 0 print("Enter first number: ") val num1 = readLine()?.toIntOrNull() ?: 0 print("Enter second number: ") val num2 = readLine()?.toIntOrNull() ?: 0 try { val result = when (choice) { 1 -> add(num1, num2) 2 -> subtract(num1, num2) 3 -> multiply(num1, num2) 4 -> divide(num1, num2) else -> throw IllegalArgumentException("Invalid choice") } println("Result: $result") } catch (e: Exception) { println("Error: ${e.message}") } } 17:T5e9,fun add(a: Int, b: Int): Int { if (a < 0 || b < 0) { throw IllegalArgumentException("Both numbers must be positive") } return a + b } fun subtract(a: Int, b: Int): Int { if (a < 0 || b < 0) { throw IllegalArgumentException("Both numbers must be positive") } return a - b } fun multiply(a: Int, b: Int): Int { if (a < 0 ||