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# Answer to Question #43046 in C++ for nona

Question #43046
Write a c program that reads a credit card number from the user. The c program will display:  Valid: if the credit card is valid  Invalid: if the credit card is invalid The program will also display the type of the credit card according to the starting digit (1st digit from left to right). The credit card number must start with:  3 for American Express  4 for Visa  5 for MasterCard  6 for Discover Card The total number of digits of a credit card number must be between 13 to 16 digits. In addition, your program should validate credit card numbers according to Luhn Rule that is basically can be described as follows (as an illustration, the rules will be applied to the credit card number 4388576018402626): 1. Double every even digit from right to left. If the doubling results in two digits number, sum the digits to get a single digit number. 2. Compute the sum of single digit numbers obtained from step 1 above: Sum of even single-digits = 4 + 4 + 8 + 2 + 3 + 1 + 7
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