Finding the Armstrong number in a given range is rather a code heavy experience. Before that we should know what is Armstrong number, what it exactly means in number theory. It is also known as a narcissistic number, because it is the sum of its own digits each raised to the power of the number of digits.
Consider the number 153. The number of digits is 3. Now, if each digit of that number is raised to the power of 3, the sum is equal to 153.
Keeping that logic in mind, from 0 to 9, all numbers are Armstrong or narcissistic number.
In the following program, we will let users to give a lower limit and an upper limit, such as, 0 as lower limit, and 100, or 1000 as upper limit. Our program will find all the Armstrong numbers between 0 to that number.