Example 80: Verify a Credit Card Number
Explore how to verify the validity of a credit card number using C programming. Learn string handling techniques to check digit count and apply validation rules to ensure the number is correct. Understand how to convert characters to numerical digits and implement this logic in your code.
We'll cover the following...
We'll cover the following...
Problem
A credit card number is usually a 16-digit number. A valid credit card number would satisfy the rules explained in the illustration below:
Write a function that receives a credit card number and checks ...