#include <stdio.h>
#include <cs50.h>
#include <math.h>
int main(void)
{
long int number;
int count = 0; // starting the count counter
do
{
number = get_long("Please enter your 13-16 digit credit card number: \n"); //getting input from the user
}
while (number <= 0);
int d1 = number % 10; //seperating digit number 1
int d2 = ((number % 100) / 10); //seperating digit number 2
int d3 = ((number % 1000) / 100); //seperating digit number 3
int d4 = ((number % 10000) / 1000); //seperating digit number 4
int d5 = ((number % 100000) / 10000); //seperating digit number 5
int d6 = ((number % 1000000) / 100000); //seperating digit number 6
int d7 = ((number % 10000000) / 1000000); //seperating digit number 7
int d8 = ((number % 100000000) / 10000000); //seperating digit number 8
int d9 = ((number % 1000000000) / 100000000); //seperating digit number 9
int d10 = ((number % 10000000000) / 1000000000); //seperating digit number 10
int d11 = ((number % 100000000000) / 10000000000); //seperating digit number 11
int d12 = ((number % 1000000000000) / 100000000000); //seperating digit number 12
int d13 = ((number % 10000000000000) / 1000000000000); //seperating digit number 13
int d14 = ((number % 100000000000000) / 10000000000000); //seperating digit number 14
int d15 = ((number % 1000000000000000) / 100000000000000); //seperating digit number 15
int d16 = ((number % 10000000000000000) / 1000000000000000); //seperating digit number 16
int last13 = number / 1000000000000; //finding the last one digit of 13 digit VISA
int last15 = number / 10000000000000; //finding the last two digit of 15 digit AMEX
int last16v = number / 1000000000000000; //finding the last one digit of 16 digit VISA
int last16m = number / 100000000000000; //finding the last two digit of 16 digit MASTERCARD
int a2 = (d2 * 2);
int a4 = (d4 * 2);
int a6 = (d6 * 2);
int a8 = (d8 * 2);
int a10 = (d10 * 2);
int a12 = (d12 * 2);
int a14 = (d14 * 2);
int a16 = (d16 * 2);
if (a2 >= 10) // separating the digits of the multiple
{
int a11a = (a2 % 100) / 10;
int a12a = (a2 % 10);
a2 = a11a + a12a;
}
if (a4 >= 10) // separating the digits of the multiple
{
int a31 = (a4 % 100) / 10;
int a32 = (a4 % 10);
a4 = a31 + a32;
}
if (a6 >= 10) // separating the digits of the multiple
{
int a51 = (a6 % 100) / 10;
int a52 = (a6 % 10);
a6 = a51 + a52;
}
if (a8 >= 10) // separating the digits of the multiple
{
int a71 = (a8 % 100) / 10;
int a72 = (a8 % 10);
a8 = a71 + a72;
}
if (a10 >= 10) // separating the digits of the multiple
{
int a91 = (a10 % 100) / 10;
int a92 = (a10 % 10);
a10 = a91 + a92;
}
if (a12 >= 10) // separating the digits of the multiple
{
int a111 = (a12 % 100) / 10;
int a112 = (a12 % 10);
a12 = a111 + a112;
}
if (a14 >= 10) // separating the digits of the multiple
{
int a131 = (a14 % 100) / 10;
int a132 = (a14 % 10);
a14 = a131 + a132;
}
if (a16 >= 10) // separating the digits of the multiple
{
int a151 = (a16 % 100) / 10;
int a152 = (a16 % 10);
a16 = a151 + a152;
}
int b = d1 + d3 + d5 + d7 + d9 + d11 + d13 + d15;
int c = a2 + a4 + a6 + a8 + a10 + a12 + a14 + a16;
int l = b + c;
int j = a2 + a4 + a6 + a8 + a10 + a12;
int k = d1 + d3 + d5 + d7 + d9 + d11 + d13;
int m = j + k;
int e = d1 + d3 + d5 + d7 + d9 + d11 + d13 + d15;
int x = a2 + a4 + a6 + a8 + a10 + a12 + a14;
int n = x + e;
printf("%i", n);
if (l % 10 == 0) //checking if the checksum is valid
{
for (int i = number; number != 0; i++) // counting the credit card number
{
number /= 10;
count++;
}
if (count == 16)
{
if (last16m == 51) // checking the last two digit of credit card
{
printf("MASTERCARD\n"); // printing the result based on last two digits
}
else if (last16m == 52) // checking the last two digit of credit card
{
printf("MASTERCARD\n"); // printing the result based on last two digits
}
else if (last16m == 53) // checking the last two digit of credit card
{
printf("MASTERCARD\n"); // printing the result based on last two digits
}
else if (last16m == 54) // checking the last two digit of credit card
{
printf("MASTERCARD\n"); //// printing the result based on last two digits
}
else if (last16m == 55) // checking the last two digit of credit card
{
printf("MASTERCARD\n"); // printing the result based on last two digits
}
else if (last16v == 4) // checking the last two digit of credit card
{
printf("VISA\n"); // printing the result based on last two digits
}
else
{
printf("INVALID\n");
}
if (count != 16)
{
printf("INVALID\n");
}
}
else
{
printf("INVALID\n");
}
}
if (m % 10 == 0) //checking if the checksum is valid
{
for (int i = number; number != 0; i++) // counting the credit card number
{
number /= 10;
count++;
}
if (count == 13)
{
if (last13 == 4) // checking the last one digit of credit card
{
printf("VISA\n"); // printing the result based on last one digit
}
else
{
printf("INVALID\n");
}
}
else
{
printf("INVALID\n");
}
}
if (n % 10 == 0) //checking if the checksum is valid
{
for (int i = number; number != 0; i++) // counting the credit card number
{
number /= 10;
count++;
}
if (count == 15)
{
if (last15 == 34) // checking the last two digit of credit card
{
printf("AMEX\n"); // printing the result based on last two digits
}
else if (last15 == 37) // checking the last two digit of credit card
{
printf("AMEX\n"); // printing the result based on last two digits
}
else
{
printf("INVALID\n");
}
if (count != 15)
{
printf("INVALID\n");
}
}
else
{
printf("INVALID\n");
}
}
}
I tried using 4003600000000014 and it gives the correct output. Taking 4222222222222, it returns INVALID. It also doesn't works for AMEX numbers (15 digits). It doesn't responds on giving 4111111111111113 as input (it should return 0). Please tell me what's wrong, I am a newbie to programming. This is the result it gives on checking it through check50 https://submit.cs50.io/check50/44370b403c33f9b47d462e3278458901599d16e1.
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