Trying to rewrite a code to include the modulus operator - c++

Question

The problem is as follows:
Input is the "t" number of data sets, followed by t 11-digit numbers. There's a cipher included in the code as an array. The code is supposed to multiply the subsequent digits from the input number by the corresponding digits from the cipher, thus creating a sum of 11 multiplications. After that the code checks whether the sum is divisible by 10. If so, it returns "correct", if not - "incorrect".
I've written a code which works as intended, but I'd like to simplify this code, specifically to include the modulus operator instead of fmod to extract the digits from the 11-digit input numbers. I've tried using modulus, but it can only be utilized for an int.
I found a code for a simple reversed order digit extractor (using the while loop and %10), but I'm having some trouble implementing it in my code... Any help would be appreciated.
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
long long int number;
int cipher [11] = {1,3,7,9,1,3,7,9,1,3,1};
int t, digit, sum;
cin >> t;
for (int i=0; i<t; i++)
{
sum = 0;
cin >> number;
for (int j=10; j>=0; j--)
{
digit = fmod(number/(pow(10,(10-j))),10);
sum = sum + digit*cipher[j];
}
if (sum%10==0)
cout << "Correct" << endl;
else
cout << "Incorrect" << endl;
}
return 0;
}
An example of a correct number is 44051401458. We're assuming all the input numbers are always 11 digits.

Answer 1

I think this is what you are referring to. You can just keep dividing number by 10, which will shift the decimal point. It will not turn into a float since you defined number as an int (long long int), so any decimal point just gets erased and you can use modulus freely.
#include <iostream>
#include <cmath>
using namespace std;
int main()
{
long long int number;
int cipher [11] = {1,3,7,9,1,3,7,9,1,3,1};
int t, digit, sum;
cin >> t;
for (int i=0; i<t; i++)
{
sum = 0;
cin >> number;
for (int j=10; j>=0; j--)
{
digit = number%10;
number = number/10;
sum = sum + digit*cipher[j];
}
if (sum%10==0)
cout << "Correct" << endl;
else
cout << "Incorrect" << endl;
}
return 0;
}