Loop Entry Control Vs Loop Exit Control:
=========================================

Loop Entry Control:
	condition:

Loop Exit Control:
	{
	}condition;

while ==> Loop Entry Control


DO-WHILE Loop:
==============
Loop Exit Control Statement

Syntax:
	Initialization
	do{
		statement-1;
		statement-2;
		update;
	}
	while(condition);

// WAP IN JS TO PRINT ALL NUMBERS FROM 10 TO 1 USING DO-WHILE.

let start = 10;

do{
    console.log(start);
    start--;
}
while(start > 0);
	
============================================
Conditions in Loops:
====================
while(condition)
{
	if(condition-1)
	{
		if-block
	}
	else
	{
		else block
	}
	update;
}

==================================
// WAP TO PRINT ALL EVEN NUMBERS IN JAVASCRIPT FROM 100 TO 80 USING DO WHILE.

let start = 100;
do{
    if(start % 2 == 0)
    {
        console.log(start);
    }
    start--;
}while(start >= 80);
=============

// WAP TO CHECK WHETHER THE GIVEN NUMBER IS PALINDROME NUMBER OR NOT.

/*
reverse(num) == num
reverse of number
121 ==> 1 X 10^2 + 2 X 10^1 + 1 X 10^0

121 / 10 ==> rem = 1, quo = 12

reverse_number = reverse_number * 10 + ind_dig
*/

var n = 1231;
var num = n;
reverse = 0

while(n > 0)
{
    digits = n % 10; digits// 1 2   2   1
    reverse = reverse * 10 + digits; // 1   12  122 1221
    n = Math.floor(n / 10);  // 122  12 1 0 
}
if(reverse == num)
{
    console.log("It is a palindrome number.");
}
else
{
    console.log("It is not a palindrome number.");
}
==================================
for loop:
=========
==> Loop Entry Control Statement

Syntax_1:
=========
	initialization;
	for(;condition;update)
	{
		loop body;
	}

Syntax_2:
=========
	for(initialization;condition;update)
	{
		loop body;
	}

Syntax_3:
==========
	initialization
	for(;condition;)
	{
		loop body;
		update;
	}

// WAP TO PRINT THE SUM OF ALL ODD NUMBERS FROM 1 TO 20

var sum_odd = 0;

for(let s = 1;s <= 20;s++){
    // logic to find all odd numbers
    if(s % 2 != 0)
    {
        sum_odd += s; // 1 4
    }
}
console.log("The Sum of all Odd numbers = "+sum_odd);

Armstrong number:
================
Sum of nth-power of individual digits of a number which equals to original number ==> Armstrong number.

xyz ==> x^3  + y^3 + z^3 == xyz
abcd ==> a^4 + b^4 + c^4 + d^4 == abcd
pqrst ==> p^5 + q^5 + r^5 + s^5 + t^5 == pqrst

// Assignment:
===============
WAP IN JAVASCRIPT TO CHECK WHETHER THE GIVEN NUMBER IS ARMSTRONG NUMBER OR NOT.