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"?> |
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Output:
Yes
Time Complexity: O(num), where num is the number of digits in the given number.
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