这个程序到底是哪里出错了

Question

public class Pic {
​ public static void main(String[] args) {
​ Scanner in = new Scanner(System.in);
​ System.out.println("计科2101,20211210003，")；
​ int a,b,c,d;
​ for(a=1;a<=9;a++)
​ {
​ for(b=1;b<=9-a;b++)
​ System.out.print("");
​ for(c=1;c<=a;c++)
​ System.out.print(c);
​ for(d=a-1;d>=1;d--)
​ System.out.print(d);
​ System.out.print("\n");
​ }
​ }
}
输出一个数字三角形，全是报错

Answer 1

System.out.println("计科2101,20211210003，"); //这里是英文分号
缩进给你改了，以后贴代码要用代码块贴哈~

import java.util.Scanner;
public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
    System.out.println("计科2101,20211210003，");
    int a, b, c, d;
    for (a = 1; a <= 9; a++) {
        for (b = 1; b <= 9 - a; b++)
            System.out.print("");
        for (c = 1; c <= a; c++)
            System.out.print(c);
        for (d = a - 1; d >= 1; d--)
            System.out.print(d);
        System.out.print("\n");
    }
}