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java分?jǐn)?shù)四則運(yùn)算代碼 java簡易四則運(yùn)算計(jì)算器代碼

編寫一個(gè)實(shí)現(xiàn)四則運(yùn)算的JAVA程序

import java.text.DecimalFormat;

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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{

System.out.print("請(qǐng)輸入第一個(gè)數(shù):");

double x = scanner.nextDouble();

System.out.print("請(qǐng)輸入第二個(gè)數(shù):");

double y = scanner.nextDouble();

System.out.print("請(qǐng)輸入運(yùn)算符:");

String s = scanner.next();

char z = s.charAt(0);

zhidao.yunsuan(x, y, z);

}catch(Exception e){

System.out.println("請(qǐng)輸入正確的數(shù)據(jù)!");

}

System.out.print("是否繼續(xù)?continue:繼續(xù),任意字符:結(jié)束");

condition = scanner.next();

}while("continue".equals(condition));

}

public static void yunsuan(double x,double y,Character z){

DecimalFormat r=new DecimalFormat();

r.applyPattern("#0.00");

if(z.equals('+')){

System.out.println(x+"+"+y+"=" + r.format((x+y)));

} else if(z.equals('-')){

System.out.println(x+"-"+y+"=" + r.format((x-y)));

} else if(z.equals('*')){

System.out.println(x+"*"+y+"=" + r.format((x*y)));

} else if(z.equals('/')){

if(y==0){

System.out.println("被除數(shù)不能為0");

} else{

System.out.println(x+"/"+y+"=" + r.format((x/y)));

}

}else{

System.out.println("無法識(shí)別改運(yùn)算符");

}

}

}

求教我這個(gè)java分?jǐn)?shù)四則運(yùn)算,num1怎么隨著運(yùn)算而變化的,求改正。還有怎么把符號(hào)帶入運(yùn)算?

(1)你做加減 乘除時(shí)均忘記符號(hào)位了,僅處理了符號(hào)全是正的情形。

建議不需要符號(hào)位,將正負(fù)號(hào)放到分子中,化簡時(shí)保證分母是正的即可

如分?jǐn)?shù)-3/4 a=-3 b=4

否則加減法均需要分4種情況處理,乘除法也需要判斷同符號(hào)不同符號(hào)兩種情況處理

(2)加減 乘除的結(jié)果現(xiàn)在保留在當(dāng)前分?jǐn)?shù)對(duì)象中,若不想修改當(dāng)前分?jǐn)?shù),

可將方法中增加一個(gè)臨時(shí)分?jǐn)?shù)對(duì)象

如加法

public String add(CNumber oper)

{

CNumber result=new CNumber();

result.a=this.a*oper.b+oper.a*this.b;

result.b=this.b*oper.b;

return result.toString();

}

不過建議加減 乘除的結(jié)果不是返回字符串對(duì)象,而是返回分?jǐn)?shù)對(duì)象,以方便多個(gè)分?jǐn)?shù)運(yùn)算。

(3)化簡分?jǐn)?shù)算法過于麻煩,找公約數(shù)可用輾轉(zhuǎn)相除法具體代碼如下

public void simpleCNumber() //化簡結(jié)果仍保存在當(dāng)前對(duì)象中,不需要另建對(duì)象

{

long m=(long)Math.abs(a), n=b , r ;

if(a==0) {b=1;return;}

while r!=0

{

m=n; n=r; r=m%n;

}

a/=n; b/=n;

}

java實(shí)現(xiàn)四則運(yùn)算

最后一個(gè)提示沒看懂意思。import java.util.Random;

public class JiS {

public static void main(String[] args)

{

Random r=new Random();

char[]ch=new char[]{'+','-','*','/'};

boolean flag=true;

while(flag){

int a=r.nextInt(10001);

int b=r.nextInt(10001);

char c=ch[r.nextInt(ch.length)];

// System.out.println(a+","+b+","+c);

switch(c)

{

case '+':

if(a+b=10000){System.out.println(a+"+"+b+"="+(a+b));flag=false;}

break;

case '-':

if(a-b=0){System.out.println(a+"-"+b+"="+(a-b));flag=false;}

break;

case '*':

if(a*b=10000){System.out.println(a+"*"+b+"="+a*b);flag=false;}

break;

case '/':

if(b!=0){System.out.println(a+"/"+b+"="+a/b);flag=false;}

break;

}

}

}

}

如何用Java編寫四則運(yùn)算程序?

(首先建個(gè)類,把這些復(fù)制粘貼進(jìn)去)

import java.awt.*;

import javax.swing.*;

public class F {

JFrame frame = new JFrame("計(jì)算機(jī)");

JPanel pl = new JPanel();

JPanel p2 = new JPanel();

static JTextField show = new JTextField();

static JButton b0 = new JButton("0");

static JButton b1 = new JButton("1");

static JButton b2 = new JButton("2");

static JButton b3 = new JButton("3");

static JButton b4 = new JButton("4");

static JButton b5 = new JButton("5");

static JButton b6 = new JButton("6");

static JButton b7 = new JButton("7");

static JButton b8 = new JButton("8");

static JButton b9 = new JButton("9");

JButton bjia = new JButton("+");

JButton bjian = new JButton("-");

JButton bcheng = new JButton("*");

JButton bchu = new JButton("/");

JButton bdian = new JButton(".");

JButton bdeng = new JButton("=");

JButton bqingchu = new JButton("清除");

public void y() {

pl.setLayout(new GridLayout(1, 1));

pl.add(show);

}

public void p() {

b1.addActionListener(new U());

b2.addActionListener(new U());

b3.addActionListener(new U());

b4.addActionListener(new U());

b5.addActionListener(new U());

b6.addActionListener(new U());

b7.addActionListener(new U());

b8.addActionListener(new U());

b9.addActionListener(new U());

b0.addActionListener(new U());

bjia.addActionListener(new Fu());

bjian.addActionListener(new Fu());

bcheng.addActionListener(new Fu());

bchu.addActionListener(new Fu());

bdeng.addActionListener(new Deng());

bqingchu.addActionListener(new Qing());

p2.setLayout(new GridLayout(6, 3));

p2.add(b1);

p2.add(b2);

p2.add(b3);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.add(b7);

p2.add(b8);

p2.add(b9);

p2.add(b0);

p2.add(bjia);

p2.add(bjian);

p2.add(bcheng);

p2.add(bchu);

p2.add(bdian);

p2.add(bqingchu);

p2.add(bdeng);

}

public void o() {

frame.setLayout(new BorderLayout());

frame.add(pl, BorderLayout.NORTH);

frame.add(p2, BorderLayout.CENTER);

frame.setSize(400, 300);

frame.setVisible(true);

}

public static void main(String[] args) {

F f = new F();

f.y();

f.p();

f.o();

}

}

(再新建個(gè)類 把這些也復(fù)制粘貼進(jìn)去)

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class U implements ActionListener {

public static String str = "";

public static String a = "";

public static String b = "";

public static String k = "";

public void actionPerformed(ActionEvent e) {

String w = e.getActionCommand();//字

if (k.equals("")) {

a += w;

F.show.setText(a);

} else {

b += w;

F.show.setText(b);

}

}

}

(再新建一個(gè),把下面的復(fù)制粘貼)

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Deng implements ActionListener {

public void actionPerformed(ActionEvent e) {

int a = Integer.parseInt(U.a);

int b = Integer.parseInt(U.b);

int c = 0;

if (U.k.equals("+")) {

c = a + b;

} else

if (U.k.equals("-")) {

c = a - b;

} else

if (U.k.equals("*")) {

c = a * b;

} else

if (U.k.equals("/")) {

c = a / b;

} else {

}

String d = String.valueOf(c);

F.show.setText(d);

U.a = d;

U.b = "";

U.k = "";

}

}

(在建一個(gè) 復(fù)制粘貼)

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Fu implements ActionListener {

public void actionPerformed(ActionEvent e) {

String a = e.getActionCommand();//字

U.k = a;

}

}

(在建一個(gè))

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

public class Qing implements ActionListener {

public void actionPerformed(ActionEvent e) {

U.a = "";

U.b = "";

U.k = "";

F.show.setText("");

}

}

java簡單的四則運(yùn)算.

public class Arithmetic {

public static void Ari(){

Scanner scan = new Scanner(System.in);

StringBuffer buffer = new StringBuffer();

DecimalFormat dec = new DecimalFormat("0.00");//格式化結(jié)果保留兩位小數(shù)

String all = "";//所有的計(jì)算表達(dá)式連在一起

System.out.println("請(qǐng)輸入表達(dá)式的個(gè)數(shù),只能為正整數(shù)");

int n = scan.nextInt();

System.out.println("請(qǐng)依次輸入要計(jì)算的表達(dá)式");

? ?for(int i=0;in+1;i++){

? ? buffer = buffer.append(scan.nextLine()+",");

? ?}

? ?all = buffer.substring(0, buffer.lastIndexOf(","));

? ?String allAri[] = all.split(",");

? ?String ari = "";//不同的算法表達(dá)式

? ?float add;//加法的計(jì)算結(jié)果

? ?float subtract;//減肥的計(jì)算結(jié)果

? ?float multi;//乘法的計(jì)算結(jié)果

? ?float divison;//除法的計(jì)算結(jié)果

? ?int model;//模運(yùn)算的計(jì)算結(jié)果

? ?for(int j=0;jallAri.length;j++){

? ? ari = allAri[j];

? ? if(ari.contains("+")){

? ? String tempAry[] = ari.split("[+]");

? ? add = Float.valueOf(tempAry[0])+Float.valueOf(tempAry[1]);

? ? System.out.println(dec.format(add));

? ? }else if(ari.contains("-")){

? ? String tempAry[] = ari.split("[-]");

? ? subtract = Float.valueOf(tempAry[0])-Float.valueOf(tempAry[1]);

? ? System.out.println(dec.format(subtract));

? ? }else if(ari.contains("*")){

? ? String tempAry[] = ari.split("[*]");

? ? multi = Float.valueOf(tempAry[0])*Float.valueOf(tempAry[1]);

? ? System.out.println(dec.format(multi));

? ? }else if(ari.contains("/")){

? ? String tempAry[] = ari.split("[/]");

? ? divison = Float.valueOf(tempAry[0])/Float.valueOf(tempAry[1]);

? ? System.out.println(dec.format(divison));

? ? }else if(ari.contains("%")){

? ? String tempAry[] = ari.split("[%]");

? ? model = Integer.valueOf(tempAry[0])%Integer.valueOf(tempAry[1]);

? ? System.out.println(model);

? ? }

? ?}

}

public static void main(String[] args) {

Ari();

}

}

測(cè)試結(jié)果截圖如下:

你的測(cè)試用例的輸入的表達(dá)式的個(gè)數(shù)是4個(gè),但下面的計(jì)算表達(dá)式好像少了一個(gè),所以我加了一個(gè)除法的計(jì)算表達(dá)式,若理解有誤,還望說明。

java,四則運(yùn)算怎么寫啊,比如String s="1+(2-4)", 我想得到結(jié)果,這個(gè)程序怎么寫啊,求詳細(xì)代碼

運(yùn)算就使用double吧。Double d=1+(2-4); 數(shù)字計(jì)算只能用double?;蛘逽tring s=1+(2-4)+"";


本文題目:java分?jǐn)?shù)四則運(yùn)算代碼 java簡易四則運(yùn)算計(jì)算器代碼
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