课堂测试

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("");
??}
?}

}