public class Main{
    public static double add(double a, double b){
        return a + b;
    }
    
    public static double minus(double a, double b){
        return a - b;
    }
    
    public static double multiply(double a, double b){
        return a * b;
    }
    
    public static double divide(double a, double b){
        return a / b;
    }
    
    public static void main(String args[]){
        System.out.println("4.4加上7.11的结果：" + Main.add(4.4, 7.11));
        System.out.println("8.9减去2.28的结果：" + Main.minus(8.9, 2.28));
        System.out.println("5.2乘以13.14的结果：" + Main.multiply(5.2, 13.14));
        System.out.println("92除以89的结果：" + Main.divide(92, 89));
    }
}