Java 打印简单数字图案的程序

编写一个 Java 程序，使用 for 循环打印一个简单的数字图案。

import java.util.Scanner;

public class SimpleNumber1 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		System.out.print("Simple Number Pattern Rows = ");
		int rows = sc.nextInt();
		
		System.out.println("Printing Simple Number Pattern");
		
		for (int i = 1 ; i <= rows; i++ ) 
		{
			for (int j = 1 ; j <= i; j++ ) 	
			{
				System.out.print(j + " ");
			}
			System.out.println();
		}
	}
}

这个示例使用 while 循环显示数字的直角三角形图案。

import java.util.Scanner;

public class SimpleNumber2 {
	
	private static Scanner sc;
	
	public static void main(String[] args) {
		
		sc = new Scanner(System.in);	
		
		int i = 1, j ; 
		
		System.out.print("Enter Rows = ");
		int rows = sc.nextInt();
		
		
		while (i <= rows) 
		{
			j = 1 ;
			
			while ( j <= i) 	
			{
				System.out.print(j + " ");
				j++;
			}
			
			System.out.println();
			i++;
		}
	}
}

Enter Rows = 9
1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5 
1 2 3 4 5 6 
1 2 3 4 5 6 7 
1 2 3 4 5 6 7 8 
1 2 3 4 5 6 7 8 9 

此程序有助于使用 do while 循环打印简单的数字图案。

import java.util.Scanner;

public class SimpleNumber3 {
	
	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 i = 1, j ; 
		
		do
		{
			j = 1 ;
			
			do	
			{
				System.out.print(j + " ");

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

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

Enter Rows = 14
1 
1 2 
1 2 3 
1 2 3 4 
1 2 3 4 5 
1 2 3 4 5 6 
1 2 3 4 5 6 7 
1 2 3 4 5 6 7 8 
1 2 3 4 5 6 7 8 9 
1 2 3 4 5 6 7 8 9 10 
1 2 3 4 5 6 7 8 9 10 11 
1 2 3 4 5 6 7 8 9 10 11 12 
1 2 3 4 5 6 7 8 9 10 11 12 13 
1 2 3 4 5 6 7 8 9 10 11 12 13 14