ouchi > Practice > Enshu02-20

import java.util.Scanner;
 
public class Driver {
 
	public static void main(String[] args) {
 
		Scanner scan = new Scanner(System.in);
 
		System.out.println("数字を入力してください");
		int x = scan.nextInt();
 
		int doubleResult = 0;
 
		try {
			doubleResult = toDouble(x);
		} catch (Exception e) {
			e.printStackTrace();
		}
		System.out.println("2倍した値: " + doubleResult);
 
		int squareResult = toSquare(x);
		System.out.println("2乗した値: " + squareResult);
 
	}
 
	public static int toDouble(int x) throws Exception {
		if (x == 0) {
			throw new Exception("x = 0");
		}
		return x * 2;
	}
 
	public static int toSquare(int x) {
		if (x == 0) {
			throw new RuntimeException("x = 0");
		}
		return x * x;
	}
 
}