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Results tagged with arithmetic
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user 386
Challenges related to elementary arithmetic.
5
votes
The Luhn algorithm for verifying credit card numbers, etc
PowerShell 123
filter L($x){$l=$x.Length-1;$l..0|%{$d=$x[$_]-48;if($_%2-eq$l%2){$s+=$d}elseif($d-le4){$s+=$d*2}else{$s+=$d*2-9}};!($s%10)}
- 483
4
votes
Find the Factorial!
PowerShell, 42 bytes
(saved 2 chars using filter instead of function)
filter f($x){if(!$x){1}else{$x*(f($x-1))}}
Output:
PS C:\> f 0
1
PS C:\> f 5
120
PS C:\> f 1
1
PS C:\> f 125
1.88267717688893E+20 …
- 483