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动手动脑01四则运算计算器

时间：2022-10-08 19:55:38浏览次数：60  
标签：01 int 四则运算 System st str 动脑 public out

完成一个计算器

阶段1：1、定义主界面菜单，

1、参数设置

2、小学二年级口算题

3、小学三年级口算题

4、小学四年级口算题

5、错题集其中参数设置包括出题个数（缺省值为30）、操作数数值范围。

要求：小学二年级口算题操作数为两个、可进行加减乘除运算（除法必须可以整除），操作数范围不超过100.小学三年级口算题操作数不超过4个，可以进行加减乘除，操作数范围不超过1000.（要求采用继承小学二年级出题类的方式，实现小学三年级的出题类）小学四年级口算题操作数不超过5个，可以进行加减乘除，还可以加入括号运算。 （要求采用继承小学三年级出题类的方式，实现小学四年级的出题类）

创建一个text类：写入主函数

package jyk.ui;

import java.awt.*;
import java.math.BigDecimal;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

public class test {
    static ArrayList<formula> list = new ArrayList<>();
    static ArrayList<str> listSrt = new ArrayList<>();

    //主函数
    public static void main(String args[]) {
        Menu menu = new Menu();
        Scanner sc = new Scanner(System.in);

        while (true) {
            menu.putMenu();
            Grade2 g2 = new Grade2();
            Grade3 g3 = new Grade3();
            Grade4 g4 = new Grade4();

            int choose = sc.nextInt();
            switch (choose) {
                case 1:
                    System.out.println("请输入出题个数");
                    int i = sc.nextInt();
                    Grade2.setQuantity(i);
                    Grade3.setQuantity(i);
                    Grade4.setQuantity(i);
                    System.out.println("请输入取值范围");
                    int j = sc.nextInt();
                    Grade2.setBound(j);
                    Grade3.setBound(j);
                    Grade4.setBound(j);
                    break;
                case 2:
                    g2.putIt();
                    break;
                case 3:
                    g3.putIt();
                    break;
                case 4:
                    g4.putIt();
                    break;
                case 5:
                    Grade2 g = new Grade2();//错题
            }
        }
    }

//        System.out.println("小数精确计算:");
//        System.out.println("请输入两个小数");
//        Scanner sc = new Scanner(System.in);
//        double d1 = sc.nextDouble();
//        BigDecimal b1= new BigDecimal(String.valueOf(d1));
//        double d2 = sc.nextDouble();
//        BigDecimal b2= new BigDecimal(String.valueOf(d2));
//        System.out.println("减法非精确计算结果为：" + (d1 - d2));
//        System.out.println("精确计算结果为：" + b1.subtract(b2));
//
//        System.out.println("大数精确计算:");
//        System.out.println("请输入两个大数");
//        String d11 = sc.next();
//        BigDecimal b11= new BigDecimal(d11);
//        String d22 = sc.next();
//        BigDecimal b22= new BigDecimal(d22);
//        System.out.println("加法精确计算结果为：" + b11.add(b22));
//        System.out.println("减法精确计算结果为：" + b11.subtract(b22));
//        System.out.println("乘法精确计算结果为：" + b11.multiply(b22));
//        System.out.println("除法精确计算结果为：" + b11.divide(b22));

    public static void wrongBook() {
        for (int i = 0; i < listSrt.size(); i++) {
            if(listSrt.get(i).wrongTimes>0){
                System.out.println(listSrt.get(i).st+"=");
                Scanner sc = new Scanner(System.in);
                double d = sc.nextDouble();
                if(d==listSrt.get(i).result) {
                    System.out.println("正确");
                    listSrt.get(i).wrongTimes=0;
                }
                else {
                    System.out.println("错误");
                    listSrt.get(i).wrongTimes++;
                    System.out.println("该题错误" + listSrt.get(i).wrongTimes + "次");
                    System.out.println("正确答案为:"+listSrt.get(i).result);
                }
            }
        }
    }

    public static void setRandom(Grade2 data){
        Random random = new Random(data.getQuantity() + data.getElement()%(data.getBound()));
        for (int i = 0; i < data.getQuantity(); i++) {
            int j=random.nextInt();
            if(!judgment(list,j))
            {
                formula f= new formula(j);
                list.add(f);
            }else
                i--;
        }
    }

    public static boolean judgment (ArrayList<formula> list,int j){
        for (int i = 0; i < list.size(); i++) {
            formula fo = list.get(i);
            if(fo.random == j){
                return true;
            }
        }
        return false;
    }

    public static boolean isNumber(String str) {

        for (int i = 0; i < str.length(); i++) {

            if (!Character.isDigit(str.charAt(i)) && str.charAt(i) != '.' && str.charAt(i) != ' ') {

                return false;

            }

        }

        return true;

    }
    public static Double getResult(String str) {


        if (str.isEmpty() || isNumber(str)) {

            return str.isEmpty() ? 0 : Double.parseDouble(str);

        }


        if (str.contains(")")) {



            int lIndex = str.lastIndexOf("(");

            int rIndex = str.indexOf(")", lIndex);

            return getResult(str.substring(0, lIndex) + getResult(str.substring(lIndex + 1, rIndex)) + str.substring(rIndex + 1));

        }

        if (str.contains("+")) {

            int index = str.lastIndexOf("+");

            return getResult(str.substring(0, index)) + getResult(str.substring(index + 1));

        }

        if (str.contains("-")) {

            int index = str.lastIndexOf("-");

            return getResult(str.substring(0, index)) - getResult(str.substring(index + 1));

        }

        if (str.contains("*")) {

            int index = str.lastIndexOf("*");

            return getResult(str.substring(0, index)) * getResult(str.substring(index + 1));

        }

        if (str.contains("/")) {

            int index = str.lastIndexOf("/");

            return getResult(str.substring(0, index)) / getResult(str.substring(index + 1));

        }

        return null;

    }
    public static int getFactor(int d){
        Random r = new Random();
        int i = r.nextInt(100);
        int []a = new int[100];
        int n = 0;
        for(int j = 1;j<=d;j++){
            if(d%j == 0) {
                a[n] = j;
                n++;
            }
        }
        int result = a[i%n];
        return result;
    }
}起到主要计算作用；
#写Menu类//主菜单：
package jyk.ui;


public class Menu {
    public void putMenu(){
        System.out.println("1、参数设置");
        System.out.println("2、小学二年级口算题");
        System.out.println("3、小学三年级口算题");
        System.out.println("4、小学四年级口算题");
        System.out.println("5、错题集");
    }
    public Menu(){
    }
}写Data类，完成设置要求：
package jyk.ui;


import java.util.Scanner;

public class Data {
    int quantity;
    int mode;
    int element;
    int MulAndDiv;
    int bracket;
    int bound;

    public Data() {

        Scanner sc = new Scanner(System.in);
        System.out.println("请输入打印数量:");
        this.setQuantity(sc.nextInt());
        System.out.println("请选择打印方式:");
        this.setMode(sc.nextInt());
        System.out.println("请输入操作数的个数");
        this.setElement(sc.nextInt());
        System.out.println("是否有乘除法(0/1)");
        this.setMulAndDiv(sc.nextInt());
        System.out.println("是否有括号(0/1)");
        this.setBracket(sc.nextInt());
        System.out.println("请输入取值范围");
        this.setBound(sc.nextInt());
    }

    public Data(int quantity, int mode, int element, int mulAndDiv, int bracket, int bound) {
        this.quantity = quantity;
        this.mode = mode;
        this.element = element;
        this.MulAndDiv = mulAndDiv;
        this.bracket = bracket;
        this.bound = bound;
    }

    public int getQuantity() {
        return quantity;
    }

    public void setQuantity(int quantity) {
        this.quantity = quantity;
    }

    public int getMode() {
        return mode;
    }

    public void setMode(int mode) {
        this.mode = mode;
    }

    public int getElement() {
        return element;
    }

    public void setElement(int element) {
        this.element = element;
    }

    public int isMulAndDiv() {
        return MulAndDiv;
    }

    public void setMulAndDiv(int mulAndDiv) {
        MulAndDiv = mulAndDiv;
    }

    public int isBracket() {
        return bracket;
    }

    public void setBracket(int bracket) {
        this.bracket = bracket;
    }

    public int getBound() {
        return bound;
    }

    public void setBound(int bound) {
        this.bound = bound;
    }
}
# 建
Attribute类完成设置的返回：
package jyk.ui;


public class Attribute {
    static int quantity = 30;
    static int mode = 3;
    static int element;
    static int MulAndDiv;
    static int bracket = 1;
    static int bound;

    public static int getQuantity() {
        return quantity;
    }

    public static void setQuantity(int quantity) {
        Attribute.quantity = quantity;
    }

    public static int getMode() {
        return mode;
    }

    public static void setMode(int mode) {
        Attribute.mode = mode;
    }

    public static int getElement() {
        return element;
    }

    public static void setElement(int element) {
        Attribute.element = element;
    }

    public static int getMulAndDiv() {
        return MulAndDiv;
    }

    public static void setMulAndDiv(int mulAndDiv) {
        MulAndDiv = mulAndDiv;
    }

    public static int getBracket() {
        return bracket;
    }

    public static void setBracket(int bracket) {
        Attribute.bracket = bracket;
    }

    public static int getBound() {
        return bound;
    }

    public static void setBound(int bound) {
        Attribute.bound = bound;
    }

    public Attribute() {
    }
}
#建
formula类，完成随机数：
package jyk.ui;


public class formula {
    int random;



    public formula() {
    }

    public formula(int random) {
        this.random = random;
    }

    public int getRandom() {
        return random;
    }

    public void setRandom(int random) {
        this.random = random;
    }
}


#建
Grade2类，实现二年级：
package jyk.ui;
import java.util.Random;
import java.util.Scanner;
import static jyk.ui.test.*;
public class Grade2 {
    static int quantity = 30;
    int mode = 3;
    int element;
    int MulAndDiv = 1;
    int bracket ;
    static int bound = 100;

    public int getQuantity() {
        return quantity;
    }

    public static void setQuantity(int q) {
        quantity = q;
    }

    public int getMode() {
        return mode;
    }

    public void setMode(int mode) {
        this.mode = mode;
    }

    public int getElement() {
        return element;
    }

    public void setElement(int element) {
        this.element = element;
    }

    public int getMulAndDiv() {
        return MulAndDiv;
    }

    public void setMulAndDiv(int mulAndDiv) {
        MulAndDiv = mulAndDiv;
    }

    public int getBracket() {
        return bracket;
    }

    public void setBracket(int bracket) {
        this.bracket = bracket;
    }

    public int getBound() {
        return bound;
    }

    public static void setBound(int b) {
        bound = b;
    }
    {
        element = 2;
        bracket = 0;
    }
    public void putIt(){
        setRandom(this);
        int m,n,wrongTimes = 0;

        int p=0,h=0;
        char[]a = {'+', '-', '*', '/'};
        char[]b = {'+','-'};
        int []number=new int[100];
        if(this.MulAndDiv == 1) {//有乘除
            for (int i = 0; i < this.quantity; i++) {
                Random random=new Random();//list.get(i).getRandom()
                str s = new str();
                for (int j = 0; j < this.element; j++) {
                    number[j] = random.nextInt(this.bound);
                }
                System.out.printf("%d、", i+1);//序号
                System.out.printf("%d",number[0]);
                s.st = s.st + number[0];
                for (int k = 1; k < this.element; k++) {//打印
                    n = random.nextInt(100);//随机括号
                    m = random.nextInt(4);//随机符号
                    System.out.printf("%c",a[m]);
                    s.st = s.st + a[m];
                    if(h==1)
                        h++;
                    if(n%2==0&&k< this.element-1&&p==0) {
                        System.out.printf("(");
                        s.st = s.st + "(";
                        p=1;//左括号已存在
                        h++;
                    }
                    if(h==2) {
                        if(m == 3) {
                            int l = getFactor(number[k-1]);
                            System.out.printf("%d)", l );
                            s.st = s.st + l + ")";
                            p=0;
                            h=0;
                        }
                        else {
                            System.out.printf("%d)", number[k]);
                            s.st = s.st + number[k] + ")";
                            p = 0;
                            h = 0;
                        }
                    }
                    else {
                        if(m == 3) {
                            int l = getFactor(number[k-1]);
                            System.out.printf("%d",l );
                            s.st = s.st + l;
                        }
                        else {
                            System.out.printf("%d", number[k]);
                            s.st = s.st + number[k];
                        }
                    }

                }
                s.result = getResult(s.st);
                listSrt.add(s);
                System.out.printf("=");
                Scanner sc = new Scanner(System.in);
                double d = sc.nextDouble();
                if(d==listSrt.get(i).result)
                    System.out.println("正确");
                else {
                    System.out.println("错误");
                    wrongTimes++;
                    s.wrongTimes++;
                    System.out.println("该题错误" + s.wrongTimes + "次");
                    System.out.println("正确答案为:"+s.result);
                }
//                if((i+1) % data.mode==0)//打印格式
//                    System.out.printf("\n");
            }
        }
        System.out.println("正确率为" + (this.quantity-wrongTimes) * 100 / this.quantity  + "%");
        while (true){
            System.out.println("是否继续练习错题(0/1):");
            Scanner sc = new Scanner(System.in);
            if(sc.nextInt() == 1){
                wrongBook();
            }
            else break;
        }
    }
    public Grade2() {

    }
}

#建
Grade3类，三年级继承二年级：
package jyk.ui;


public class Grade3 extends Grade2 {

    {
        element = 4;
        bracket = 0;
    }
    public Grade3(){

    }
}



#建


Grade4类，四年级继承三年级：


package jyk.ui;



public class Grade4 extends Grade3{

    {
        element = 5;
        bracket = 1;
    }

    public Grade4(){

    }

}
#建


str类，错题：


package jyk.ui;


public class str {
    String st;
    double result;
    int wrongTimes;

    public String getSt() {
        return st;
    }

    public void setSt(String st) {
        this.st = st;
    }

    public int getWrongTimes() {
        return wrongTimes;
    }

    public void setWrongTimes(int wrongTimes) {
        this.wrongTimes = wrongTimes;
    }

    public str(String st, double result, int wrongTimes) {
        this.st = st;
        this.result = result;
        this.wrongTimes = wrongTimes;
    }

    public double getResult() {
        return result;
    }

    public void setResult(double result) {
        this.result = result;
    }

    public str(String str, double result) {
        this.st = str;
        this.result = result;
    }

    public str(String str) {
        this.st = str;
    }

    public String getStr() {
        return st;
    }

    public void setStr(String str) {
        this.st = str;
    }

    public str() {
        st = "";
        result = 0;
        wrongTimes = 0;
    }
}基本实现要求：
阶段2：1、学生实时答题结束后，可以选择是否进行下一套题目答题，如果选择是，则抽取下一套题进行答题，答题结束可以通过查看错题本，查询今日做题正确率。2、也可以针对错题进行二次答题。


#建


str类，错题：


package jyk.ui;


public class str {
    String st;
    double result;
    int wrongTimes;

    public String getSt() {
        return st;
    }

    public void setSt(String st) {
        this.st = st;
    }

    public int getWrongTimes() {
        return wrongTimes;
    }

    public void setWrongTimes(int wrongTimes) {
        this.wrongTimes = wrongTimes;
    }

    public str(String st, double result, int wrongTimes) {
        this.st = st;
        this.result = result;
        this.wrongTimes = wrongTimes;
    }

    public double getResult() {
        return result;
    }

    public void setResult(double result) {
        this.result = result;
    }

    public str(String str, double result) {
        this.st = str;
        this.result = result;
    }

    public str(String str) {
        this.st = str;
    }

    public String getStr() {
        return st;
    }

    public void setStr(String str) {
        this.st = str;
    }

    public str() {
        st = "";
        result = 0;
        wrongTimes = 0;
    }



 


 



 


 


 


 











标签：01,int,四则运算,System,st,str,动脑,public,out	

From： https://www.cnblogs.com/jingyk/p/16770027.html
      

      




      

      

        
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