四则运算

import java.util.Scanner;
public class Jisuan {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		 double a;
		 double b;
		 Scanner reader = new Scanner(System.in);
		 a = reader.nextDouble();
		 b = reader.nextDouble();
		A jisuan = new A();
			System.out.println("两者之和为："+jisuan.add(a,b));
			System.out.println("两者之差为："+jisuan.reduce(a,b));
			System.out.println("两者之积为："+jisuan.multiply(a,b));
			System.out.println("两者之商为："+jisuan.divide(a,b));
			System.out.println("a的平方为："+jisuan.square1(a));
			System.out.println("b的平方为："+jisuan.square2(b));
	}

}
class A{
	double add(double a,double b){
    	return a+b;
    }
    double reduce(double a,double b){
    	return a-b;
    }
    
    double multiply(double a,double b){
    	return a*b;
    }
    double divide(double a,double b){
    	return a/b;
    }
    double square1(double a){
    	return a*a;
    }
    double square2(double b){
    	return b*b;
    }
}

四则运算

原文：http://blog.csdn.net/zjx211314/article/details/39157963