Java经典编程习题100例：第21例：Java打印杨辉三角

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import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入行数：");
        int row = sc.nextInt();
        int[][] arr = new int[row][row];
        for (int i = 0; i < row; i++) {
            for (int j = 0; j <= i; j++) {
                if (j == 0 || j == i) {
                    arr[i][j] = 1;
                } else {
                    arr[i][j] = arr[i - 1][j - 1] + arr[i - 1][j];
                }
                System.out.print(arr[i][j] + " ");
            }
            System.out.println();
        }
    }
}