WAP to print all Armstrong numbers between 1 to 10,000 in Java
What is Armstrong Number ?
- An Armstrong number (also known as a narcissistic number) is a number that is equal to the sum of the n-th power of its digits, where n is the number of digits.
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Example: 153 is an Armstrong number because:
13+53+33=153
Logical Steps:
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Iterate numbers from 1 to 10,000.
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Use a loop from 1 to 10,000 to check each number.
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Calculate the number of digits for each number.
- Count digits using a while loop.
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Calculate the sum of digits raised to the power of the number of digits.
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Use a for loop to compute the power manually (or we can also use
Math.pow()).
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Use a for loop to compute the power manually (or we can also use
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Check if the sum is equal to the original number.
- If it matches, print the number as an Armstrong number.
Programs:
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Below is the simple program:
public class ArmstrongNumberList { public static void main(String[] args) { System.out.println("Armstrong numbers between 1 and 10,000 are:"); for (int no = 1; no <= 10000; no++) { int originalNumber = no; int sum = 0; // Calculate the number of digits int temp = no; int digits = 0; while (temp != 0) { digits++; temp = temp / 10; } int currentNumber = no; while (currentNumber != 0) { int rem = currentNumber % 10; int power = 1; // Calculate rem^digits using a basic loop for (int i = 0; i < digits; i++) { power = power * rem; } sum = sum + power; currentNumber = currentNumber / 10; } if (sum == originalNumber) { System.out.println(originalNumber); } } } }Output:
1 2 3 4 5 6 7 8 9 153 370 371 407 1634 8208 9474
Program Explanation
- For deep explanation please read the explanation of program "Check Armstrong Number"
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