PHP | Check if a number is armstrong number
Given a number, we need to check whether it is an armstrong number or not in PHP. An Armstrong number is the one whose value is equal to the sum of the cubes of its digits.
Examples:
Input : 407
Output : Yes
407 = (4*4*4) + (0*0*0) + (7*7*7)
= 64 + 0 + 343
= 407
Input : 303
Output : No
Approach: For every digit r in input number x, compute r3. If sum of all such values is equal to n, then print “Yes”, else “No”.
<?php // PHP code to check wether a number is // armstrong number or not // function to check whether the number is // armstrong number or not function armstrongCheck($number){ $sum = 0; $x = $number; while($x != 0) { $rem = $x % 10; $sum = $sum + $rem*$rem*$rem; $x = $x / 10; } // if true then armstrong number if ($number == $sum) return 1; // not an armstrong number return 0; } // Driver Code $number = 407; $flag = armstrongCheck($number); if ($flag == 1) echo "Yes"; else echo "No"?> |
chevron_right
filter_none
Output:
Yes
Time Complexity: O(num), where num is the number of digits in the given number.
Recommended Posts:
- PHP | Check if a number is Perfect number
- PHP | check if a number is Even or Odd
- PHP | Check if a number is prime
- Check a number is Prime or not using JavaScript
- Check whether a given Number is Power-Isolated or not
- How to check if a number evaluates to Infinity using JavaScript ?
- How to disable scroll to change number in <input type="number"> field using JavaScript/jQuery?
- PHP | Factorial of a number
- PHP | Sum of digits of a number
- How to convert a string into number in PHP?
- What is the difference between parseInt() and Number()?
- Factorial of a number using JavaScript
- AngularJS | number Filter
- How to convert number to month name in PHP?
- Round off a number to the next multiple of 5 using JavaScript
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.
