We use cookies to ensure you have the best browsing experience on our website. Please read our cookie policy for more information about how we use cookies.
  1. Prepare
  2. Python
  3. Regex and Parsing
  4. Validating Credit Card Numbers
  5. Discussions

Validating Credit Card Numbers

  • mohammedaymaned1
     + 0 comments

    here is my code without regex because i don't know what that is 

    `num = int(input())
i = 0
credits = [None] * num
while (i < num):
    credits[i] = input()
    i += 1

for credit in credits:
    if credit[0] not in "456":
        print ("Invalid")
        continue
    count = 0
    digit = False
    is_16_digit = False
    is_consecutive = False
    hyphen_count = 0
    for c in credit:
        if c.isdigit():
            count +=1
            digit = True
        elif c == "-" and count % 4 == 0:
            hyphen_count += 1
            continue
        else:
            digit = False
            break
        if count == 16:
            is_16_digit = True
    credit = credit.replace("-","")
    for c in credit:
        if c+c+c+c in credit:
            is_consecutive = True
            break
    if is_16_digit == False:
        print("Invalid")
        continue
     
    elif digit == False:
        print("Invalid")
        continue
    elif is_consecutive:
        print("Invalid")
        continue
    elif hyphen_count > 3:
        print("Invalid")
        continue
    else:
        print("Valid")

    `