String 16

In C++ how do I convert an int to a C-style string?

I've been stuck on this for some time now. I want to get a user to enter am int that ranges 1-16 digits long. I then want to send that to a function like this:

char* int_to_cstring(int user_num, char number_string[16])
{
}

In that function I want to store each digit of the int in the char array. How do I go about doing that? I know there is a built in function that converts int to char but I want to make a new one.
Also, will I have to put a '' (null character) in the char[n] that is immediately after the last digit? I'm not too sure how c strings work.

Consider that the remainder left by dividing an int by 10 (decimal) is the binary value of that particular decimal digit. Add the appropriate value to convert to ASCII ('0'), and you have the display digit. Then divide the original value by 10 (decimal) and use the quotient for the next cycle. Stop when the quotient is zero.

Yes, you do need to put a null at the end. I suggest you fill number_string[] with them before even starting the conversion.

I think this is known as a "cascading polynomial" by the way. A similar method is used to convert ASCII to an int.

Hope that helps.

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