9.18-JZTXT






import java.util.Scanner;

public class sizeyunsuan {
    public static void main(String[] args) {
        int[]  a = new int[30];
        int[]  b = new int[30];
        Scanner myScanner = new Scanner(System.in);
        for (int i = 0; i < 30; i++) {
            int firNum = 1 + (int) (Math.random() * 99);//生成1-99的随机数,+1是为防止出现0
            int secNum = 1 + (int) (Math.random() * 99);
            int operaNum = 1 + (int) (Math.random() * 4);//生成1-4的随机数

            //加法
            if (operaNum == 1) {
                System.out.println(firNum + "+" + secNum + "=?");
                int rightAnswer = firNum + secNum;
                System.out.println("请输入答案")
                int userAnswer = myScanner.nextInt();
                 a[i]=rightAnswer;

            }

            //减法
            if (operaNum == 2) {
                if (firNum > secNum) {
                    System.out.println(firNum + "-" + secNum + "=?");
                }
                else if (firNum < secNum){
                    System.out.println(secNum + "-" + firNum + "=?");
                }
            }


            //乘法
            if (operaNum == 3) {
                System.out.println(firNum + "*" + secNum + "=?");
            }


            //除法
            if (operaNum == 4) {
                if( firNum % secNum ==0 ) {
                    if (secNum != 0) {
                        System.out.println(firNum + "/" + secNum + "=?");
                    } else if (firNum != 0) {
                        System.out.println(secNum + "/" + firNum + "=?");
                    }
                }
            }


        }
    }
}