与胖虎学Java的第四天---类的重载

同时计算int型、double型的加减乘除

package E018;
/*add()、substract()、multiply()
、division()*/
public class Countsum {
    public static int add(int a, int b){
        return a+b;
    }

    public static double add(double x, double y){
        return x+y;
    }
    
    public static int substract(int a, int b){
        return a-b;
    }

    public static double substract(double x, double y){
        return x-y;
    }
    
    public static int multiply(int a, int b){
        return a*b;
    }

    public static double multiply(double x, double y){
        return x*y;
    }
    
    public static int division(int a, int b){
        if(b==0)
            return -1;
        else
            return a/b;
    }

    public static double division(double x, double y){
        if(y==0)
            return -1;
        else
            return x/y;
    }

    public static  String add(String m,String n) {
        return m+n;
    }
    
}

package E018;

import java.util.Scanner;


/*.加减乘除功能函数，改造为可以计算两个整数的加减乘除、
 * 两个double的加减乘除，以及两个字符串的连接功能（仍旧用add方法）。

提示：使用函数重载功能，创建不同的add()、substract()、multiply()
、division()函数。*/
public class Count {

    
    public static void main(String[] args) {
        System.out.println("请输入用于计算的两个数值，数值间用空格间隔:" );
        Scanner in=new Scanner(System.in);
        int a=in.nextInt();
        int b=in.nextInt();
        double x=in.nextDouble();
        double y=in.nextDouble();
        String m=in.next();
        String n=in.next();
        in.close();
 
        //Countsum countsum1=new Countsum();
        
        System.out.println("和为"+Countsum.add(a,b) );
        System.out.println("和为"+Countsum.add(x,y) );
        System.out.println("差为"+Countsum.substract(a,b) );
        System.out.println("差为"+Countsum.substract(x,y) );
        System.out.println("积为"+Countsum.multiply(a,b) );
        System.out.println("积为"+Countsum.multiply(x,y) );
        
        int e=Countsum.division(a,b);
        if(b==0){
            System.out.println("分母不能为0");
        }
        else{
            System.out.println("商为："+e);
        }
        
        double f=Countsum.division(x,y);
        if(y==0){
            System.out.println("分母不能为0");
        }
        else{
            System.out.println("商为："+f);
        }
        
        String i=Countsum.add(m,n);
        {
            System.out.println("连接字符串为："+i); 
        }       
        
    }

    


}