打印杨辉三角

利用二维数组实现打印杨辉三角
代码如下:

import java.util.*;
public class Test04 {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		System.out.println("请问你要输出几行:");
		int n = sc.nextInt();
		int[][] a=new int[n][n];
		int i,j;
		for(i=0;i<n;i++) {
			for(j=0;j<=i;j++) {
				if(j = = 0 || i = = 0) {
					a[i][j] = 1;
				}else {
					a[i][j]=a[i-1][j]+a[i-1][j-1];
				}
				System.out.print(a[i][j]+" ");
			}
			System.out.println();
		}
		sc.close();
	}
}

效果图如下: