//上機實踐5 數組與字符串 實驗1 數組的用法  YangHui.java
public class YangHui
{
	public static void main(String[] args)
	{
		int num=1;
		int i,j;
		if(args.length<1)
		{
			System.out.println("請在命令行中輸入楊輝三角形的行數，例如：java YangHui 10");
			System.exit(0);
		}
		try
		{
			num=Integer.parseInt(args[0]);	
			if(num<1)
			{
				System.out.println("行數請輸入一個大于0的數！");
				System.exit(0);
			}
		}
		catch (Exception e)
		{
			System.out.println("請輸入數字！");
			System.exit(0);
		}		
		int[] firstList=new int[num+1];
		int[] lastList=new int[num+2];
		for (i=0;i<=1;i++)
			firstList[i]=1;
		lastList[0]=1;
		for (i=1;i<=num;i++)
		{
			for (j=0;j<=i;j++)
			{
				System.out.print(String.format("%6d",firstList[j]));				
			}
			System.out.println();
			for (j=1;j<=num;j++)
			{
				lastList[j]=firstList[j-1]+firstList[j];
			}
			lastList[num]=1;
			System.arraycopy(lastList,0,firstList,0,num+1);
		}
	}
};