https://github.com/trox25/visa-mastercard-americanexpress

C program that validates credit card numbers and identifies the type of card based on known number patterns and Luhn’s Algorithm
https://github.com/trox25/visa-mastercard-americanexpress

c luhn-algorithm

Last synced: 11 months ago
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C program that validates credit card numbers and identifies the type of card based on known number patterns and Luhn’s Algorithm

• Host: GitHub
• URL: https://github.com/trox25/visa-mastercard-americanexpress
• Owner: TROX25
• License: mit
• Created: 2025-06-15T12:16:28.000Z (12 months ago)
• Default Branch: main
• Last Pushed: 2025-06-15T12:20:09.000Z (12 months ago)
• Last Synced: 2025-06-24T05:06:56.462Z (12 months ago)
• Topics: c, luhn-algorithm
• Language: C
• Homepage:
• Size: 5.86 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
# Visa-Mastercard-AmericanExpress

This is a simple C program that validates credit card numbers and identifies the type of card based on known number patterns and Luhn’s Algorithm.

Supported card types:

- 💳 Visa

- 💳 Mastercard

- 💳 American Express

## 🔍 How It Works

- Prompts the user to enter a credit card number.

- Applies **Luhn’s Algorithm** to validate the number.

- Checks the **length** and **starting digits** to determine the card issuer.

- Prints one of the following results:

  - `VISA`

  - `MASTERCARD`

  - `AMEX`

  - `INVALID`

## 💻 Example

Number: 378282246310005

AMEX