Nested Loops:
=============
Syntax:
	for(initialization; condition; update)
	{
		loop body statements;
		for(initialization; condition; update)
		{
			loop body statements;
		}
	}

	for(initialization; condition; update)
	{
		loop body statements;
		initialization for while;
		while(condition)
		{
			while loop body;
			update;
		}
	}

	initialization for while;
	while(condition)
	{
		while loop body;
		for(init; condition; update)
		{
			for loop body;
		}
		update;
	}

// nested loops
// 4 X 7 pattern
// with numbers
class nestedLoops{
    public static void main(String x[])
    {
        //row implementation
        for(int row = 1;row <= 4;row++)
        {
            for(int col = 1;col <= 7;++col)
            {
                System.out.print(col+"\t");
            }
            System.out.println();
        }
    }
}

==================================================

// WAP TO PRINT ALL THREE PALINDROME NUMBERS.
// we should iterate from 100 to 999
// while iterating, that every number can be apply for checking whether it is palindrome number or not.

class palindromePrint{
    public static void main(String x[])
    {
        int i = 100;
        while(i <= 999)
        {
            int j = i;
            int reverse = 0,remainder;
            for(;j != 0;)
            {
                remainder = j % 10;
                reverse = reverse * 10 + remainder;
                j/=10;
            }
            if(reverse == i)
            {
                System.out.print(i+"\t");
            }
            ++i;
        }
        System.out.println();
    }
}

=================================================
Q: WAP TO PRINT ALL 7 MULTIPLES FROM 1000 TO 2000.

============================

// WAP TO CHECK WHETHER THE NUMBER IS ARMSTRONG NUMBER OR NOT.
// THE SUM OF EQUIALENT POWERS OF INDIVIDUAL DIGITS OF A NUMBER IS EQUALS TO GIVEN NUMBER IS CALLED AS "ARMSTRONG NUMBER"
// XYZ => X^3 + Y^3 + Z^3 == XYZ
// abcd => a^4 + b^4 + c^ 4 + d^4 == abcd
// pow(x,y) ==> x^y
//math.pow(x,y)

import java.util.Scanner;
class CheckingArmstrong{
    public static void main(String x[])
    {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter a three digit value;");
        int num = sc.nextInt();
        int ind_dig,powers,s_power = 0;
        
        for(int n = num;n != 0;)
        {
            ind_dig = n % 10;
            powers = ind_dig * ind_dig * ind_dig;
            s_power = s_power + powers;
            n /= 10;
        }
        if(s_power == num)
        {
            System.out.println("It is an Armstrong number.");
        }
        else
        {
            System.out.println("It is not an Armstrong number.");
        }
    }
}