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Thank you for your comment. May I ask a little about your solution ?
My solution is almost exactly the same, excep that in this while loop
int dig = carry % 10;
arr[len - 1] = dig;
carry /= 10;
I did not have the step dig = carry % 10, and my answer was correct up to 15 !, but after that it was wrong. It worked for numbers even as big as 25 ! when I added the line dig = carry % 10.
I really don't understand why because I wrote my program in C++ and even store everything in unsigned long, which gives me the maximum of bits I can think of..But yours seem to be written in C and you stored everything in int ? When I tried to store my variables in int, it did not give the correct answer.
I would really appreciate if someone knows the answer why there is such a difference in result !