使用函数完成两个数的加减乘除，将结果返回。注意乘法和除法中不能有任何一个参与计算的数为0

public class Calculator {
    public static void main(String[] args) {
        int a = 10;
        int b = 5;

        int sum = add(a, b);
        int difference = subtract(a, b);
        int product = multiply(a, b);
        double quotient = divide(a, b);

        System.out.println("Sum: " + sum);
        System.out.println("Difference: " + difference);
        System.out.println("Product: " + product);
        System.out.println("Quotient: " + quotient);
    }

    public static int add(int a, int b) {
        return a + b;
    }

    public static int subtract(int a, int b) {
        return a - b;
    }

    public static int multiply(int a, int b) {
        return a * b;
    }

    public static double divide(int a, int b) {
        if (b == 0) {
            throw new ArithmeticException("Divisor cannot be zero");
        }
        return (double) a / b;
    }
}