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测试加减法的JAVA代码 java加减法程序编写
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求简单java写计算器代码加减乘除
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Calculator extends JFrame implements ActionListener
{
private boolean dotExist, operated, equaled; // 帮助运算的布尔变量
private double storedNumber; // 目前的结果
private char lastOperator; // 表示上一运算符
private JTextField operation; // 结果栏
private JButton dot, plus, minus, multi, div, sqrt, equal, changePN, clear; // 运算符
private JButton[] numbers; // 数字
// 构造者
public Calculator()
{
setTitle("Calculator");
// 初始化变量
dotExist = false; // 表示当前的数是否有小数点
operated = false; // 表示任意运算符是否被按下
equaled = false; // 表示等号是否被按下
storedNumber = 0;
lastOperator = '?';
// 初始化窗口变量
operation = new JTextField("0");
operation.setEditable(false);
numbers = new JButton[10];
for (int i = 0; i 10; i++)
numbers[i] = new JButton("" + i);
dot = new JButton(".");
plus = new JButton("+");
minus = new JButton("-");
multi = new JButton("*");
div = new JButton("/");
sqrt = new JButton("√");
equal = new JButton("=");
changePN = new JButton("±");
clear = new JButton("AC");
// 将窗口物体放入窗口
GridBagLayout layout = new GridBagLayout();
getContentPane().setLayout(layout);
addComponent(layout, operation, 0, 0, 4, 1);
addComponent(layout, numbers[1], 1, 0, 1, 1);
addComponent(layout, numbers[2], 1, 1, 1, 1);
addComponent(layout, numbers[3], 1, 2, 1, 1);
addComponent(layout, numbers[4], 2, 0, 1, 1);
addComponent(layout, numbers[5], 2, 1, 1, 1);
addComponent(layout, numbers[6], 2, 2, 1, 1);
addComponent(layout, numbers[7], 3, 0, 1, 1);
addComponent(layout, numbers[8], 3, 1, 1, 1);
addComponent(layout, numbers[9], 3, 2, 1, 1);
addComponent(layout, dot, 4, 0, 1, 1);
addComponent(layout, numbers[0], 4, 1, 1, 1);
addComponent(layout, sqrt, 4, 2, 1, 1);
addComponent(layout, plus, 1, 3, 1, 1);
addComponent(layout, minus, 2, 3, 1, 1);
addComponent(layout, multi, 3, 3, 1, 1);
addComponent(layout, div, 4, 3, 1, 1);
addComponent(layout, equal, 5, 0, 2, 1);
addComponent(layout, changePN, 5, 2, 1, 1);
addComponent(layout, clear, 5, 3, 1, 1);
}
// 对按钮进行反应的方法
public void actionPerformed(ActionEvent e)
{
JButton btn = (JButton)e.getSource();
if (btn == clear)
{
operation.setText("0");
dotExist = false;
storedNumber = 0;
lastOperator = '?';
}
else if (btn == equal)
{
operate('=');
equaled = true;
}
else if (btn == plus)
{
operate('+');
equaled = false;
}
else if (btn == minus)
{
operate('-');
equaled = false;
}
else if (btn == multi)
{
operate('*');
equaled = false;
}
else if (btn == div)
{
operate('/');
equaled = false;
}
else if (btn == changePN)
{
operate('p');
operate('=');
equaled = true;
}
else if (btn == sqrt)
{
operate('s');
operate('=');
equaled = true;
}
else
{
if (equaled)
storedNumber = 0;
for (int i = 0; i 10; i++)
if (btn == numbers[i])
{
if (operation.getText().equals("0"))
operation.setText("" + i);
else if(! operated)
operation.setText(operation.getText() + i);
else
{
operation.setText("" + i);
operated = false;
}
}
if (btn == dot ! dotExist)
{
operation.setText(operation.getText() + ".");
dotExist = true;
}
}
}
// 进行运算的方法
private void operate(char operator)
{
double currentNumber = Double.valueOf(operation.getText()).doubleValue();
if (lastOperator == '?')
storedNumber = currentNumber;
else if (lastOperator == '+')
storedNumber += currentNumber;
else if (lastOperator == '-')
storedNumber -= currentNumber;
else if (lastOperator == '*')
storedNumber *= currentNumber;
else if (lastOperator == '/')
storedNumber /= currentNumber;
else if (lastOperator == 'p')
storedNumber *= -1;
else if (lastOperator == 's')
storedNumber = Math.sqrt(currentNumber);
else if (lastOperator == '=' equaled)
storedNumber = currentNumber;
operation.setText("" + storedNumber);
operated = true;
lastOperator = operator;
}
// 快捷使用GridBagLayout的方法
private void addComponent(GridBagLayout layout, Component component, int row, int col, int width, int height)
{
GridBagConstraints constraints = new GridBagConstraints();
constraints.fill = GridBagConstraints.BOTH;
constraints.insets = new Insets(10, 2, 10, 2);
constraints.weightx = 100;
constraints.weighty = 100;
constraints.gridx = col;
constraints.gridy = row;
constraints.gridwidth = width;
constraints.gridheight = height;
layout.setConstraints(component, constraints);
if (component instanceof JButton)
((JButton)component).addActionListener(this);
getContentPane().add(component);
}
// 主方法初始化并显示窗口
public static void main(String[] args)
{
Calculator calc = new Calculator();
calc.setSize(290, 400);
calc.setVisible(true);
}
}
相关问答
Q1: 用java编写程序 课题：算术运算测试
你好，按照你的要求代码如下，可以直接运行
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
public class test {
public static void main(String[] args) {
int count = 0;
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
for (int i = 0; i 10; i++) {
int a = (int) (Math.random() * 100);
int b = (int) (Math.random() * 100);
int c = (int) (Math.random() * 2);
int r = 0;
switch (c) {
case 0:
if (a + b = 100) {
a = 100 - b;
}
System.out.print(a + " + " + b + " = ");
r = a + b;
break;
case 1:
if (a b) {
int t = a;
a = b;
b = t;
}
System.out.print(a + " - " + b + " = ");
r = a - b;
}
int input;
try {
input = Integer.valueOf(in.readLine());
} catch (Exception e1) {
System.out.println("答案错误\n");
continue;
}
if (input == r) {
count++;
System.out.println("答案正确\n");
} else {
System.out.println("答案错误\n");
}
}
if (null != in) {
try {
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
System.out.println("答对数量：" + count + "\n得分: " + count * 10);
}
}
Q2: 一道JAVA作业题（小学生加减法测验）
package my.test.main;
import java.util.Scanner;
public class Exam {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner in = new Scanner(System.in);
int score = 0;
// 十次循环测试加减法的JAVA代码，出题
for (int i = 0; i 10; i++) {
// 通过随机产生1和2，来决定这题是加法还是减法
int operate = (int) (Math.random() * 2 + 1);
int result = 0;// 每题测试加减法的JAVA代码的结果
if (operate == 1) {// 1做加法
int num1, num2;
// 产生连个相加不和不超出50测试加减法的JAVA代码的整数
do {
num1 = (int) (Math.random() * 51);
num2 = (int) (Math.random() * 51);
} while (num1 + num2 50);
result = num1 + num2;
System.out.println(num1 + "+" + num2 + "=");
} else if (operate == 2) {// 2做减法
int num1, num2;
// 产生两个整数，用大的减去小的
num1 = (int) (Math.random() * 51);
num2 = (int) (Math.random() * 51);
if (num1 num2) {
result = num1 - num2;
System.out.println(num1 + "-" + num2 + "=");
} else {
result = num2 - num1;
System.out.println(num2 + "-" + num1 + "=");
}
}
// 三次输入答案机会
for (int j = 1; j = 3; j++) {
int input = in.nextInt();
if (input == result) {
switch (j) {
case 1:
score += 10;
break;
case 2:
score += 7;
break;
case 3:
score += 5;
break;
}
System.out.println("正确!");
break;
} else {
System.out.println("错误!还可以回答" + (3 - j) + "次。");
}
}
}
if (score 90) {
System.out.println("总分为测试加减法的JAVA代码：" + score + ",SMART!");
} else if (score 80 score = 90) {
System.out.println("总分为：" + score + ",GOOD!");
} else if (score 70 score = 80) {
System.out.println("总分为：" + score + ",OK!");
} else if (score 60 score = 70) {
System.out.println("总分为：" + score + ",PASS!");
} else {
System.out.println("总分为：" + score + ",TRY AGAIN!");
}
}
}
Q3: java 中实现复数的加减
（1）测试加减法的JAVA代码：具体代码(附注释)
复数类测试加减法的JAVA代码：
public class Complex {
private float shibu;
private float xubu;
Complex()
{this(0,0);
}
Complex(float shibu,float xubu){
this.shibu=shibu;
this.xubu=xubu;
}
public void Add(Complex p)
{
Complex result=new Complex();
result.shibu=this.shibu+p.shibu;
result.xubu=this.xubu+p.xubu;
System.out.print("加法结果为:"+result.shibu+"+"+result.xubu+"i");
}
public void Sub(Complex p)
{
Complex result=new Complex();
result.shibu=this.shibu-p.shibu;
result.xubu=this.xubu-p.xubu;
System.out.print("加法结果为:"+result.shibu+"+"+result.xubu+"i");
}
public void Mul(Complex p)
{
Complex result=new Complex();
result.shibu=this.shibu*p.shibu-this.xubu*p.xubu;
result.xubu=this.shibu*p.xubu+p.shibu*this.xubu;
System.out.print("乘法结果为:"+result.shibu+"+"+result.xubu+"i");
}
public static void main(String[] args) {
Complex fushu1=new Complex(1,2);
Complex fushu2=new Complex(3,4);
fushu1.Add(fushu2);
fushu1.Sub(fushu2);
fushu1.Mul(fushu2);
}
}
（2）：提供一个例子：
源代码：
import java.io.*;
public class Book{
double sb;
double xb;
Book(double x,double y){
this.sb=x;
this.xb=y;
}
Book(){
}
public static void main(String args[]){
System.out.println("请输入数据：");
double a=0;
double b=0;
double c=0;
double d=0;
String s;
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入第一个复述测试加减法的JAVA代码的实部：");
try{
s = in.readLine();
a=Double.parseDouble(s);
}
catch(IOException e)
{ System.out.println("抛掷异常");}
System.out.println("请输入第一个复述测试加减法的JAVA代码的虚部：");
try{
s = in.readLine();
b =Double.parseDouble(s);
}
catch(IOException e)
{ System.out.println("抛掷异常");}
System.out.println("请输入第二个复述的实部：");
try{
s = in.readLine();
c =Double.parseDouble(s);
}
catch(IOException e)
{ System.out.println("抛掷异常");}
System.out.println("请输入第二个复述的虚部：");
try{
s = in.readLine();
d =Double.parseDouble(s);
}
catch(IOException e)
{ System.out.println("抛掷异常");}
Book h;
h=new Book(a,b);
Book j;
j=new Book(c,d);
System.out.println("您输入的一个数为：");
toString(h);
System.out.println("您输入的二个数为：");
toString(j);
Book k;
k=new Book();
char z='y';
do{
System.out.println("请选择您要进行的计算：");
System.out.println("1 ：进行加法运算");
System.out.println("2 ：进行减法运算");
System.out.println("3 ：进行修改");
System.out.println("4 ：进行乘法运算");
System.out.println("5 ：进行除法运算");
System.out.println("6 ：查看修改结果");
int i=0;
try{
i= Integer.parseInt(in.readLine());
}
catch(IOException e)
{ System.out.println("抛掷异常");}
switch(i)
{
case 1:
k.sb=jia(h.sb,j.sb);
k.xb=jia(h.xb,j.xb);
System.out.println("计算结果的实部为："+k.sb);
System.out.println("计算结果的虚部为："+k.xb);
toString(k);
break ;
case 2:
k.sb=jian(h.sb,j.sb);
k.xb=jian(h.xb,j.xb);
System.out.println("计算结果的实部为："+k.sb);
System.out.println("计算结果的虚部为："+k.xb);
toString(k);
break ;
case 3:
System.out.println("请输入您要修改哪个实数：");
int l=0;
try{
l= Integer.parseInt(in.readLine());
}
catch(IOException e)
{ System.out.println("抛掷异常");}
if(l==1)
{
h.xiugais(h);
h.xiugaix(h);
}
else
{
xiugais(j);
xiugaix(j);
}
break ;
case 4:
double f=0;
double e=0;
f=cheng(h.sb,j.sb)+cheng(h.xb,j.xb);
e=cheng(h.sb,j.xb)+cheng(h.xb,j.sb);
k.sb=(double)(Math.round(f*100)/100.0);
k.xb=(double)(Math.round(e*100)/100.0);
System.out.println("计算结果的实部为："+k.sb);
System.out.println("计算结果的虚部为："+k.xb);
toString(k);
break ;
case 5:
double chushu=cheng(j.sb,j.sb)-cheng(j.xb,-j.xb);
double beichushus=jian(cheng(h.sb,j.sb),cheng(h.xb,-j.xb));
double beichushux=jia(cheng(h.sb,-j.xb),cheng(h.xb,j.sb));
k.sb=chu(beichushus,chushu);
k.xb=chu(beichushux,chushu);
System.out.println("计算结果的实部为："+k.sb);
System.out.println("计算结果的虚部为："+k.xb);
toString(k);
break ;
case 6:
System.out.println("修改后的结果为：");
System.out.println("第一个复数："+toString(h));
System.out.println("第二个复数："+toString(j));
break ;
}
System.out.println("请问您是否还要继续 y/n：");
try{
z=(char)System.in.read();
System.in.skip(2); //忽略回车换行
}
catch(IOException e){}
} while(z=='y');
}
public static double gets(Book a){
return a.sb;
}
public static double getx(Book b){
return b.xb;
}
public static double xiugais(Book a)
{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入您要修改的实部：");
double m=0;
try{
m= Double.parseDouble(in.readLine());
}
catch(IOException e)
{ System.out.println("抛掷异常");}
a.sb=m;
System.out.println("修改成功：");
return 0;
}
public static double xiugaix(Book b)
{
BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入您要修改的虚部：");
double n=0;
try{
n= Double.parseDouble(in.readLine());
}
catch(IOException e)
{ System.out.println("抛掷异常");}
b.xb=n;
System.out.println("修改成功：");
return 0;
}
public static double jia(double a,double b)//
{
double c=0;
c=a+b;
System.out.println("加法成功：");
return c ;
}
public static double jian(double a,double b)
{
double c=0;
c=a-b;
System.out.println("减法成功：");
return c;
}
public static double cheng(double a,double b)
{
double c=0;
c=a*b;
System.out.println("乘法成功：");
return c;
}
public static double chu(double a,double b)
{
double d=0;
double c=0;
d=a/b;
c=(double)(Math.round(d*100)/100.0);
System.out.println("除法成功：");
return c ;
}
public static double toString(Book a){
System.out.println("结果为："+a.sb+"+"+a.xb+"*i");
return 0;
}
}
（3）测试结果截图：
Q4: java课程设计“小学算术运算测试程序”
花测试加减法的JAVA代码了好几个小时,测试通过,希望楼主多给点分
import java.util.Scanner;
class Question{
private int firstParam;
private int secondParam;
private String operator;
private int answer;
private int score;
public int getFirstParam() {
return firstParam;
}
public void setFirstParam(int firstParam) {
this.firstParam = firstParam;
}
public int getSecondParam() {
return secondParam;
}
public void setSecondParam(int secondParam) {
this.secondParam = secondParam;
}
public String getOperator() {
return operator;
}
public void setOperator(String operator) {
this.operator = operator;
}
public int getAnswer() {
return answer;
}
public void setAnswer(int answer) {
this.answer = answer;
}
public int getScore() {
return score;
}
public void setScore(int score) {
this.score = score;
}
//构造
public Question(int firstParam, int secondParam) {
this.firstParam = firstParam;
this.secondParam = secondParam;
}
}
public class StudentStudy {
private int questionNumber;
private String operator;
private Question[] questions;
private int rightNumber=0;
private int wrongNumber=0;
public String getOperator() {
return operator;
}
public void setOperator(String operator) {
this.operator = operator;
}
public int getQuestionNumber() {
return questionNumber;
}
public void setQuestionNumber(int questionNumber) {
this.questionNumber = questionNumber;
}
public int getRightNumber() {
return rightNumber;
}
public void setRightNumber(int rightNumber) {
this.rightNumber = rightNumber;
}
public int getWrongNumber() {
return wrongNumber;
}
public void setWrongNumber(int wrongNumber) {
this.wrongNumber = wrongNumber;
}
public Question[] getQuestions() {
return questions;
}
public void setQuestions(Question[] questions) {
this.questions = questions;
}
public int getRandom(){
return (int)(Math.random()*10);
}
public int calculateByOperator(String operator,int first,int second){
switch(operator.charAt(0)){
case '+':
return first+second;
case '-':
return first-second;
default:
return 0;
}
}
public void makeQuestion(){
mywhile:
while(questions[questionNumber-1]==null){
Question question=new Question(getRandom(),getRandom());
for(int i=0;questions[i]!=nulliquestionNumber;i++){
if((question.getFirstParam()==questions[i].getFirstParam())(question.getSecondParam()==questions[i].getSecondParam())){
continue mywhile;
}
}
for(int i=0;iquestionNumber;i++){
if(questions[i]==null){
questions[i]=question;
questions[i].setOperator(operator);
questions[i].setScore(100/questionNumber);
questions[i].setAnswer(calculateByOperator(operator,questions[i].getFirstParam(),questions[i].getSecondParam()));
break;
}
}
}
}
public StudentStudy(int questionNumber){
this.questionNumber=questionNumber;
questions=new Question[this.questionNumber];
}
public static void main(String[] args){
Scanner input=new Scanner(System.in);
System.out.println("现在开始测试,请填写要测试测试加减法的JAVA代码的试题数量(1-100):");
int number=input.nextInt();
StudentStudy ss=new StudentStudy(number);
System.out.println("请选择要测试的试题类型:1加法2减法");
int type=input.nextInt();
switch(type){
case 1:
ss.setOperator("+");
break;
case 2:
ss.setOperator("-");
break;
default:
System.out.println("输入有误,退出系统!");
System.exit(0);
}
ss.makeQuestion();
for(int i=0;inumber;i++){
System.out.println("第"+(i+1)+"题:"+ss.getQuestions()[i].getFirstParam()+ss.getQuestions()[i].getOperator()+ss.getQuestions()[i].getSecondParam()+"=?");
int answer=input.nextInt();
if(ss.getQuestions()[i].getAnswer()==answer){
ss.setRightNumber(ss.getRightNumber()+1);
System.out.println("回答正确!");
}
else{
ss.setWrongNumber(ss.getWrongNumber()+1);
System.out.println("回答错误!");
}
}
System.out.println("您总共答测试加减法的JAVA代码了"+ss.getQuestionNumber()+"道题,答对"+ss.getRightNumber()+"道,答错"+ss.getWrongNumber()+"道,最后总分为:"+ss.getRightNumber()*100/ss.getQuestionNumber()+"分");
}
}
Q5: java.求两个大数的精确加减法,a=4632864832684683568465765487657665765236465244
花了十分钟，亲手给你订制的，测试过了正确
下面给你贴出源代码
public class AddSub {
public static void main(String[] args) {
String a="4632864832684683568465765487657665765236465244";
String b="47";
int []pa=stringToInts(a);
int []pb=stringToInts(b);
String ans_add=add(pa, pb);
String ans_sub=sub(pb,pa);
System.out.println("相加结果是："+ans_add);
System.out.println("相减结果是："+ans_sub);
}
public static int[] stringToInts(String s){
int[] n = new int[s.length()];
for(int i = 0;is.length();i++){
n[i] = Integer.parseInt(s.substring(i,i+1));
}
return n;
}
public static String add(int []a,int []b){
StringBuffer sb=new StringBuffer();
int a_len= a.length-1;
int b_len=b.length-1;
int jinwei=0;//进位
while(a_len=0||b_len=0){
int temp=0;
if(a_len=0b_len=0){
temp=a[a_len]+b[b_len]+jinwei;
}else if(a_len=0){
temp=a[a_len]+jinwei;
}else if(b_len=0){
temp=b[b_len]+jinwei;
}
sb.append(temp%10+"");
jinwei=temp/10;
a_len--;b_len--;
}
return getNum(sb.reverse());
}
public static String sub(int []a,int []b){
StringBuffer sb=new StringBuffer();
boolean flag=false;//判断a是不是比b小
if(a.lengthb.length){
int c[]=a;
a=b;b=c;
flag=true;
}
int a_len= a.length-1;
int b_len=b.length-1;
int jiewei=0;//借位
while(a_len=0||b_len=0){
int temp=0;
if(a_len=0b_len=0){
if((a[a_len]-jiewei)b[b_len]){
temp=a[a_len]+10-b[b_len]-jiewei;
jiewei=1;
}else{
temp=a[a_len]-b[b_len]-jiewei;
}
}else if(a_len=0){
temp=a[a_len]-jiewei;
jiewei=0;
}
sb.append(temp+"");
a_len--;b_len--;
}
if(flag){
return getNum(sb.append("-").reverse());
}
return getNum(sb.reverse());
}
//去掉最前面的0
public static String getNum(StringBuffer sb){
while(sb.length() 1 sb.charAt(0) == '0') {
sb.deleteCharAt(0);
}
return sb.toString();
}
}
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