用java输出杨辉三角

杨辉三角：它的两个边都是1，内部其它都是肩上两个数的和

第一种：

package aaa;

public class YangHui {

	public static void main(String[] args) {
		/**
		 * 6行6列的杨辉三角
		 */
		int row = 6;//行数
		int[][] yanghui = new int[row][row];//6行6列数组

		for (int i = 0; i < row; i++){//行
			for(int j = 0;j<= i;j++){//列
				if (j==0 || j==i){
					yanghui[i][j]=1;

				}else{
					yanghui[i][j]=yanghui[i-1][j-1]+yanghui[i-1][j];
				}
				System.out.print(yanghui[i][j]+" ");
			}
			System.out.println();
		}
	}
}

第二种：等腰三角形

package aaa;

public class YangHui {

	public static void main(String[] args) {
		/**
		 * 8行8列的杨辉三角
		 */
		int row = 6;//行数
		int[][] yanghui = new int[row][row];//6行6列数组

		for (int i = 0; i < row; i++){//行
			for(int j = 0;j<= i;j++){//列
				if (j==0 || j==i){
					yanghui[i][j]=1;

				}else{
					yanghui[i][j]=yanghui[i-1][j-1]+yanghui[i-1][j];
				}
//				System.out.print(yanghui[i][j]+" ");
			}
//			System.out.println();
		}
//等腰输出处理
		for (int i = 0; i < row; i++){
			int num = row -i;
			for(int j = 0;j<= num;j++){
				System.out.print(" ");
		}
			for(int k= 0;k<= i;k++){
				System.out.print(yanghui[i][k]+" ");
		}
			System.out.println();
	}

	}
}