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JAvA中怎么能实现从键盘输入几个数字后进行四则运算

package test;import java.util.Scanner;import javax.script.ScriptEngine;import javax.script.ScriptEngineManager;import javax.script.ScriptException;public class A1{public static void main ( String[] args ){ScriptEngineManager se...

import java.util.Scanner;class Test{public static void main(String[] argv){Scanner s = new Scanner(System.in);Integer a = s.nextInt();Integer b = s.nextInt();System.out.println(a+b);}}

import java.math.BigDecimal; import java.util.Scanner; public class Calculator { public static void main(String[] args) { Calculator c = new Calculator(); while(true){ Scanner s = new Scanner(System.in); System.out.print("请输...

import java.text.DecimalFormat; import java.util.Scanner; public class Zhidao { public static void main(String[] args) { String condition = ""; Zhidao zhidao = new Zhidao(); do{ Scanner scanner = new Scanner(System.in); try{ Sy...

import java.util.Scanner; public class 四则运算 { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("请输入第一个数字:"); int a = sc.nextInt(); System.out.print("请输入字符:"); Str...

import java.text.DecimalFormat; import java.util.Scanner; public class Zhidao { public static void main(String[] args) { String condition = ""; Zhidao zhidao = new Zhidao(); do{ Scanner scanner = new Scanner(System.in); try{ Sy...

是要编程实现吗?那就跟编译原理的一些算法有关了。可以参考一下简单的递归下降法

class Class1 { public static void main(String[] args) { System.out.println("Hello World!"); //中缀 => 后缀表达式 String s = "( 1.9 + (20 + 41) / (25 * 11) - 3 ) * 2"; //中缀 String S = ""; //后缀 char[] Operators = new char[s.l...

Scanner scanner = new Scanner(System.in); DecimalFormat df = new DecimalFormat("#.00"); String type; int score=0; System.out.println("计算保留两位小数!"); for(int i=0;i

Scanner sc = new Scanner(System.in);String str =sc.nextLine();String[] arr = str.split("=");//根据等号分隔等式两边的字符串ScriptEngineManager manager = new ScriptEngineManager();ScriptEngine engine = manager.getEngineByName("js...

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