Java随即四则运算一百道，除法运算结果要四舍五入除数还不能为零，四舍五入总运行不出来，如何解决？

Question

问题遇到的现象和发生背景

除法运算结果要四舍五入还不能为零，四舍五入总运行不出来

运行结果及报错内容

我想要达到的结果

一百道四则运算最后还要在结尾附带结果，怎么解决哇

Answer 1

import java.math.BigDecimal;
import java.util.Random;
 
public class Cal {
 
    public static void main(String args[]) {
        
        String[] formulaArr = new String[100];
        String[] resultArr = new String[100];
        
        for(int i=0; i<100; i++) {
            int numOne = getNum();
            String symbol = getSymbol();
            int numTwo = getNum();
            formulaArr[i] = numOne + symbol + numTwo + "=";
            resultArr[i] = getResult(numOne, symbol, numTwo);
        }
        
        for(int i=1; i<=100; i++) {
            if(i % 10 != 0) {
                System.out.print(formulaArr[i-1] + "  ");
            }else {
                System.out.println(formulaArr[i-1]);
            }
        }
        
        System.out.println("正确答案");
        
        for(int i=1; i<=100; i++) {
            if(i % 10 != 0) {
                System.out.print(resultArr[i-1] + "  ");
            }else {
                System.out.println(resultArr[i-1]);
            }
        }
        
    }
    
    public static int getNum() {
        return (int)(Math.random()*(99))+1;
    }
    
    public static String getSymbol() {
        String[] symbolArr = new String[]{"+", "-", "*", "/"};
        int index = new Random().nextInt(symbolArr.length);
        return symbolArr[index];
    }
    
    public static String getResult(int numOne, String symbol, int numTwo) {
        switch (symbol) {
            case "+":
                return String.valueOf(numOne + numTwo);
            case "-":
                return String.valueOf(numOne - numTwo);
            case "*":
                return String.valueOf(numOne * numTwo);
            case "/":
                BigDecimal rs = new BigDecimal(numOne).divide(new BigDecimal(numTwo), 2, BigDecimal.ROUND_HALF_UP);
                return String.valueOf(rs);
            default:
                return "error";
        }
    }
    
}