lab 3 (loop แสดงตัว & และเว้นวรรค กับ รูปแสดงแถว)

.java

package com.terng;


public class Main {

    public static void main(String[] args) {
        for (int i=0; i<=3;i++)
        {
            System.out.println();
            for (int j=0;j<=9;j++)
            {
                System.out.print("&");
            }
            if (i==2)
            {
                System.out.print("\n");
            }
        }
    }
}
/////////////////////////////////////
import java.util.Scanner;
public class Loop2 
{

	public static void main(String[] args) 
	{
		System.out.print("Please input the num for loop : ");
		Scanner n = new Scanner(System.in);
		int num = n.nextInt();
		System.out.print("input : " +num+"\n");
		int counter = num;
		for (int i = 1; i<=num; i++ )
		{
			System.out.println();
			for (int j = counter; j >=1;j--)
			{
				System.out.print(j + " ");
			}
			counter--;
		}

	}

}

lab3 2.2.java

package com.terng;

import java.util.Scanner;

public class Main {
    public static void main(String args[]){

        System.out.print("Please input the num for loop : ");
        Scanner n = new Scanner(System.in);
        int num = n.nextInt();
        System.out.print("input : " +num+"\n");
        int counter = num;
        for(int i=counter; i>0 ;i--){
            for(int j=0; j < i; j++){
                System.out.print(j+1 +" ");
            }

            System.out.println("");
        }
    }
}

lab3 2.3.java

package com.terng;

import java.util.Scanner;

public class Main {
    public static void main(String args[]){

        System.out.print("Please input the num for loop : ");
        Scanner n = new Scanner(System.in);
        int num = n.nextInt();
        System.out.print("input : " +num+"\n");
        int counter = num;
        for(int i=counter; i>=1 ;i--){

            for(int j=i; j <= counter; j++){
                System.out.print(j +" ");
            }

            System.out.println("");
        }
    }
}

lab3 2.4.java

package com.terng;

import java.util.Scanner;

public class Main {
    public static void main(String args[]){

        System.out.print("Please input the num for loop : ");
        Scanner n = new Scanner(System.in);
        int num = n.nextInt();
        System.out.print("input : " +num+"\n");
        int counter = num;
        for(int i=1; i<=counter ;i++){

            for(int j=i; j >= 1; j--){
                System.out.print(j +" ");
            }
            System.out.println("");
        }
    }
}

lab3 2.5.java

package com.terng;

import java.util.Scanner;

public class Main {
    public static void main(String args[]){

        System.out.print("Please input the num for loop : ");
        Scanner n = new Scanner(System.in);
        int num = n.nextInt();
        System.out.print("input : " +num+"\n");
        int counter = num;
        for(int i=1; i<=counter ;i++){
            for(int j=1; j <= i; j++){
                System.out.print(i +" ");
            }
            System.out.println();
        }
    }
}

ผลลัพธ์อันที่1

ผลลัพธ์อันที่ 2

lab 3 2.2 output

lab 3 2.3 output

lab 3 2.4 output

เพิ่มเติมลองเข้าไปดูเว็บนี้
https://codeography.wordpress.com/2016/08/06/1-21-321-4321-54321/
แต่เป็นภาษา C ให้ดู for อย่างเดียวแล้วเอามาเปลี่ยน

lab 3 2.5 output

public class Main {

    public static void main (String[]args)
    {
        for(int r=5;r>=1;r--)
        {
            for(int c=1;c<=r;c++)
            {
                System.out.print(r);
            }
            System.out.println();
        }
    }

}