杨辉三角形初学者的必看源码

public class Question {

    /**
     * 题目：打印出杨辉三角形
     */

    public static void main(String[] args) {
        int lines = 6;
        int[] a = new int[lines + 1];
        int previous = 1;
        for (int i = 1; i <= lines; i ++){
            //空格
            for (int j = lines; j > i; j--) {
                System.out.print("   ");
            }
            for (int j = 1; j <= i; j++){
                int current = a[j];
                a[j] = previous + current;
                previous = current;
                System.out.print(a[j] + "    ");
            }
            System.out.println();
        }

    }