java计算机二级考试经典题型--打印杨辉三角

package javaStudy.day3;

import java.util.Scanner;

public class YangHui {

    public int getRowNum(){
        int result = 1;
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入杨辉三角总层数：");
        result = scanner.nextInt();
        if(result < 0){
            result = 1;
            System.out.println("杨辉三角总层数必须大于0，鉴于你给的数不符合要求，本嘟嘟决定让杨辉三角总层数为初始值1");
        }
        return result;
    }

    public int[][] printYangHui(){
        int rowNum = this.getRowNum();
//        二维数组定义
        int[][] erweiList = new int[rowNum][];
        for(int i = 0;i <= rowNum-1; i++){
            erweiList[i] = new int[i+1];
            for(int j = 0;j <= i; j++){
                if(j == 0 || j == erweiList[i].length - 1){
                    erweiList[i][j] = 1;
                }
                else {
                    erweiList[i][j] = erweiList[i-1][j-1] + erweiList[i-1][j];
                }
            }
        }
        return erweiList;
    }

    public static void main(String[] args) {
        YangHui YangHui = new YangHui();
        int[][] result = YangHui.printYangHui();
        for (int[] ints : result) {
            for (int anInt : ints) {
                System.out.print(anInt);
                System.out.print(" ");
            }
            System.out.print("n");
        }
    }
}