Divisibility by 12 for a large number in C++ Program

In this tutorial, we are going to write a program that checks whether the given large number in string format is divisible by 12 or not.

We are going to use a little bit of math to solve this problem. If the number is divisible by 3 and 4, then the number will divisible by 12.

A number is divisible by 3 if the sum of its digits is divisible by 3.

A number is divisible by 4 if the last two digits of the number are divisible by 4.

We are going to utilize the above statements and complete the program.

Example

Let's see the code.

 Live Demo

#include 
using namespace std;
bool isNumberDivisibleBy12(string num) {
   if (num.length() >= 3) {
      int last_digit = (int)num[num.length() - 1];
      if (last_digit % 2 != 0) {
         return 0;
      }
      int second_last_digit = (int)num[num.length() - 2];
      int sum = 0;
      for (int i = 0; i 

Output
If you execute the above program, then you will get the following result.
Yes
Conclusion
If you have any queries in the tutorial, mention them in the comment section.