Java入门练习之四则运算

项目目的

制作一个Java控制台程序,让他可以随机生成四则运算,并针对用户的输入判断对错。

项目分析

该项目本质上是一个四则运算出题器,可以创建一个Question类,其中应包含两个运算数(随机生成)和对应的答案,除此以外还需要实现随机产生加减乘除运算的功能。

项目实现

Question类

public class Question {
private Integer a,b;
private int answer;
private char operator;
Question(){
//随机生成两个运算数
a = (int)(1+Math.random()*10000);
b = (int)(1+Math.random()*10000);
//根据之前的随机结果生成对应运算符并计算出答案
if(a < 2500){
operator = '+';
answer = a+b;
}
else if(a < 5000) {
operator = '-';
answer = a - b;
}
else if(a < 7500) {
operator = '*';
answer = a * b;
}
else {
operator = '/';
answer = a / b;
}
}
public int getA(){
return a;
}
public int getB(){
return b;
}
public int getAnswer(){
return answer;
}
//打印题目
public void putQuestion(){
System.out.println(a.toString() + operator + b.toString() + "=?");
System.out.println("请填入\'?\'处的数字,只取整数,小数点后截断");
}
}

测试类

import java.util.Scanner;

public class Test {
private static int yourAnswer;
public static void main(String []args){
Scanner sc = new Scanner(System.in);
Question q = new Question();
q.putQuestion();
yourAnswer = sc.nextInt();
if(yourAnswer == q.getAnswer()){
System.out.println("回答正确!");
}
else {
System.out.println("回答错误");
System.out.println("正确答案:" + q.getAnswer());
}
}
}

运行结果

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" alt="image">

项目难点

该项目属于java的入门项目,没有太大的难度,中间遇到的一个小问题在于输出题目时,我当时写的代码是这样的

private int a,b;
public void putQuestion(){
System.out.println(a + operator + b + "=?");
System.out.println("请填入\'?\'处的数字,只取整数,小数点后截断");
}

在打印题目时本意是打印成: xxx(a)+ xxx(b) = ?

但编译器将operator(char)型隐式转换为int,最终打印的结果将a、operator、b三个int型相加后一起输出了。运行结果如下图:

aaarticlea/png;base64,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" alt="image">

解决方案

  1. 不使用int类,改用Integer类,并使用自带的tostring方法将a和b转化为string类型,成功打印,这也是上贴代码使用的方法
  2. 使用printf格式化输出,代码如下:

    System.out.printf("%d%c%d=?\n",a,operator,b);
  3. 使用两行print和一个println打印,代码如下:
    System.out.print(a);
System.out.print(operator);
System.out.println(b + "=?");

解决方案还有很多,以上提供三个方法供新手参考。


以上内容如有不足,欢迎指正。

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