今天完成了四则运算出题的第三阶段任务

继续写昨天的论文管理系统

下面这个程序就是一个出四则运算题的系统

package sizeys;
import java.util.Random;
import java.lang.Math;
import java.util.Scanner;

public class Randomtest {
    
    public static int[] randomCommon(int min, int max, int n){
        if (n > (max - min + 1) || max < min) {
            return null;
        }
        int[] result = new int[n];
        int count = 0;
        while(count < n) {
            int num = (int) (Math.random() * (max - min)) + min;
            boolean flag = true;
            for (int j = 0; j < n; j++) {
                if(num == result[j]){
                    flag = false;
                    break;
                }
            }
            if(flag){
                result[count] = num;
                count++;
            }
        }
        return result;
    }
    
    public static char operator(int n,int se) {
        char op=' ';
        Random random = new Random();
        n = random.nextInt(100);
        if(se==1) 
        {
            switch(n%4)
            {
            case 0:op = '+';break;
            case 1:op = '-';break;
            case 2:op = '*';break;
            case 3:op = '/';break;
            }
        }
        if(se==2)
        {
            switch(n%2)
            {
            case 0:op = '+';break;
            case 1:op = '-';break;
            }
        }
        return op;
    }
    
    public static void main(String[] args) {
        Random random = new Random();
        int a,b,c,d,n,op;
        //b随机第一个运算符 op随机第二个运算符 n出题个数 
        int i,select1,select2,select3,brackets;
        //select1选择乘除法 select2选择括号运算 select3输入操作数个数 brackets随机括号位置
        int min,max;
        
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入出题个数:");
        n = sc.nextInt();
        System.out.println("请输入任意数范围：");
        System.out.println("min=");
        min = sc.nextInt();
        System.out.println("max=");
        max = sc.nextInt();
        System.out.println("请输入操作数个数：");
        select3 = sc.nextInt();
        System.out.println("是否需要乘除法：1.需要 2.不需要");
        select1 = sc.nextInt();
        System.out.println("是否需要括号运算：1.需要 2.不需要");
        select2 = sc.nextInt();
        int[] arr = randomCommon(min,max,n*select3);
        if(n*select3>(max-min+1))
        {
            System.out.println("超出范围！");
            System.exit(0);
        }
        else
        {
            if(select3==2)
            {
                if(select1==1)
                {
                    for(i=0;i<n*select3;i++)
                    {
                        b = random.nextInt(100);
                        a = arr[i];
                        c = arr[i+1];
                        char op3 = operator(b,select1);
                        System.out.println(""+a+op3+c);
                        i++;
                    }
                }
                else if(select1==2)
                {
                    for(i=0;i<n*select3;i++)
                    {
                        b = random.nextInt(100);
                        a = arr[i];
                        c = arr[i+1];
                        char op3 = operator(b,select1);
                        System.out.println(""+a+op3+c);
                        i++;
                    }
                }
            }
            if(select3==3) 
            {
                if(select1==1) {
                    if(select2==1)
                    {
                        for(i=0;i<select3*n;i++) {
                            b = random.nextInt(100);
                            op = random.nextInt(100);
                            brackets = random.nextInt(100);
                            a = arr[i];
                            c = arr[i+1];
                            d = arr[i+2];
                            char op1 = operator(b,select1);
                            char op2 = operator(op,select1);
                            switch(brackets%2)
                            {
                            case 0:System.out.println("("+a+op1+c+")"+op2+d);break;
                            case 1:System.out.println(""+a+op1+"("+c+op2+d+")");break;
                            }
                            i++;
                            i++;
                        }
                    }
                    if(select2==2)
                    {
                        for(i=0;i<select3*n;i++) {
                            b = random.nextInt(100);
                            op = random.nextInt(100);
                            a = arr[i];
                            c = arr[i+1];
                            d = arr[i+2];
                            char op1 = operator(b,select1);
                            char op2 = operator(op,select1);
                            System.out.println(""+a+op1+c+op2+d);
                            i++;
                            i++;
                        }
                    }
                }//需要乘除法select1==1
                else if(select1==2)
                {
                    if(select2==1)
                    {
                        for(i=0;i<n*3;i++) {
                            b = random.nextInt(100);
                            op = random.nextInt(100);
                            brackets = random.nextInt(100);
                            a = arr[i];
                            c = arr[i+1];
                            d = arr[i+2];
                            char op1 = operator(b,select1);
                            char op2 = operator(op,select1);
                            switch(brackets%2)
                            {
                            case 0:System.out.println("("+a+op1+c+")"+op2+d);break;
                            case 1:System.out.println(""+a+op1+"("+c+op2+d+")");break;
                            }
                            i+=2;
                        }
                    }
                    if(select2==2)
                    {
                        for(i=0;i<n*3;i++) {
                            b = random.nextInt(100);
                            op = random.nextInt(100);
                            a = arr[i];
                            c = arr[i+1];
                            d = arr[i+2];
                            char op1 = operator(b,select1);
                            char op2 = operator(op,select1);
                            System.out.println(""+a+op1+c+op2+d);
                            i+=2;
                        }
                    }
                }//不需要乘除法select1==2
            }//3个操作数
        }//范围内
        
    }//main()
    
}//class