Java经典编程习题100例：第21例：Java打印杨辉三角

题目描述：

打印杨辉三角

解题思路：

代码：

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();
}
}
}