Given a number n, find GCD of its digits.
Input : 345 Output : 1 GCD of 3, 4 and 5 is 1. Input : 2448 Output : 2 GCD of 2, 4, 4 and 8 is 2
We traverse the digits of number one by one using below loop
digit = n mod 10; n = n / 10;
While traversing digits, we keep track of current GCD and keep updating GCD by finding GCD of current digit with current GCD.
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