Lunh Algorithm - tests an integer, like a credit card, to see if the Lunh algorithm. This is used to check to see if a credit card number is valid.
Source: “Lunh algorithm” https://www.geeksforgeeks.org/luhn-algorithm/ GeeksforGeeks Retrieved January 1. 2021
from math import * # Luhn Algorithm # 2021-01-10 EWS # Numworks Python # strings are used s=str(input('Integer? ')) l=len(s) k=l # total t=0 # loop while k>0: n=float(s[k-1]) f=(l-k)/2 if f-int(f)==0.5: if n!=0: n=fmod(2*n-1,9)+1 t=t+n k=k-1 # final results if fmod(t,10)==0: print("VALID") else: print("NOT VALID")