课堂测试

课堂测试1：

import java.util.Random;
public class Sapp {
 public static void main(String[] args) {
  Random ran=new Random();
  for(int i=1;i<31;i++) {
   int a=ran.nextInt(100);
   int b=ran.nextInt(100);
   int c=ran.nextInt(4);
   if(c==0)
   {
    System.out.print(i+".");
    System.out.println(a+"+"+b+"=");
   }
   else if(c==1&&a>=b)
   {
    System.out.print(i+".");
    System.out.println(a+"-"+b+"=");
   }
   else if(c==2&&a*b<100)
   {
    System.out.print(i+".");
    System.out.println(a+"*"+b+"=");
   }
   else if(c==3&&b!=0&&a%b==0)
   {
    System.out.print(i+".");
    System.out.println(a+"/"+b+"=");
   }
   else
   {
    i--;
   }
  }
 }

}

课堂测试2：

import java.util.Scanner;
import java.util.Random;

public class Sappp {
 static Scanner scan = new Scanner(System.in);

 public static void main(String[] args) {
  System.out.println("请输入题目数量：");
  int n = scan.nextInt();
  System.out.println("请输入每行题目个数：");
  int m = scan.nextInt();
  int[][] s1=new int[n/3+1][m];
  int[][] s2=new int[n/3+1][m];
  int[][] s3=new int[n/3+1][m];
  Random ran = new Random();
  for (int i = 1; i < (n / m)+2; i++) {
   for (int l = 1; l < m+1; l++) {
    int a = ran.nextInt(100);
    int b = ran.nextInt(100);
    int c = ran.nextInt(4);
    int k=l+(i-1)*m;
    if(k>n||(s1[i-1][l-1]==a&&s2[i-1][l-1]==b&&s3[i-1][l-1]==c))
     break;
    if (c == 0) {
     System.out.print(k+ ".");
     System.out.print(a + "+" + b + "=    ");
     s1[i-1][l-1]=a;
     s2[i-1][l-1]=b;
     s3[i-1][l-1]=c;
    } else if (c == 1 && a >= b) {
     System.out.print(k + ".");
     System.out.print(a + "-" + b + "=    ");
     s1[i-1][l-1]=a;
     s2[i-1][l-1]=b;
     s3[i-1][l-1]=c;
    } else if (c == 2 && a * b < 100) {
     System.out.print(k + ".");
     System.out.print(a + "*" + b + "=    ");
     s1[i-1][l-1]=a;
     s2[i-1][l-1]=b;
     s3[i-1][l-1]=c;
    } else if (c == 3 && b != 0 && a % b == 0) {
     System.out.print(k + ".");
     System.out.print(a + "/" + b + "=    ");
     s1[i-1][l-1]=a;
     s2[i-1][l-1]=b;
     s3[i-1][l-1]=c;
    } else {
     l--;
    }
   }
   System.out.println("");
  }
 }

}

来源：https://www.cnblogs.com/dd110343/p/11552604.html