Java 打印杨辉三角程序

编写一个Java程序使用for循环打印杨辉三角。

import java.util.Scanner;

public class PascalTriangleNumber1 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Pascal Triangle Number Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Pascal Triangle Number Pattern");
		
		for (int i = 0 ; i < rows; i++ ) 
		{
			int number = 1;
			System.out.printf("%" + (rows - i) * 2 + "s", "");
			
			for (int j = 0 ; j <= i; j++ ) 	
			{
				System.out.printf("%4d", number);
				number = number * (i - j) / (j + 1);
			}
			System.out.println();
		}
	}
}

此示例使用while循环显示数字的杨辉三角。

import java.util.Scanner;

public class PascalTriangleNumber2 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Rows = ");
		int rows = sc.nextInt();
		
		int number, j, i = 0;
		
		while(i < rows ) 
		{
			number = 1;
			System.out.printf("%" + (rows - i) * 2 + "s", "");
			j = 0 ; 
			while (j <= i ) 	
			{
				System.out.printf("%4d", number);
				number = number * (i - j) / (j + 1);
				j++;
			}
			System.out.println();
			i++;
		}
	}
}

Enter Rows = 8
                   1
                 1   1
               1   2   1
             1   3   3   1
           1   4   6   4   1
         1   5  10  10   5   1
       1   6  15  20  15   6   1
     1   7  21  35  35  21   7   1

此程序将使用do while循环打印杨辉三角。

import java.util.Scanner;

public class PascalTriangleNumber3 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Enter Rows = ");
		int rows = sc.nextInt();
		
		int number, j, i = 0;
		
		do
		{
			number = 1;
			System.out.printf("%" + (rows - i) * 2 + "s", "");
			j = 0 ; 
			
			do	
			{
				System.out.printf("%4d", number);
				number = number * (i - j) / (j + 1);

			} while (++j <= i );
			System.out.println();

		} while(++i < rows );
	}
}

Enter Rows = 12
                           1
                         1   1
                       1   2   1
                     1   3   3   1
                   1   4   6   4   1
                 1   5  10  10   5   1
               1   6  15  20  15   6   1
             1   7  21  35  35  21   7   1
           1   8  28  56  70  56  28   8   1
         1   9  36  84 126 126  84  36   9   1
       1  10  45 120 210 252 210 120  45  10   1
     1  11  55 165 330 462 462 330 165  55  11   1