formatting output with gmp_printf

[Info Account]

I am having some problems with formatted output, maybe someone here can show me
how to do this.

mpz_t target, base;

mpz_init(target);
mpz_init(base);

I've got a large number stuffed into target, say 123654789

I want to be able to output one digit at a time, with single digit precision. 
For example

9
8
7
4
5
6
3
2
1

Is there a way with gmp_printf to specify specific portions of target, and only
output them with whatever precision specified?  Are there any other string
handling functions other than gmp_printf?

Also, what would be the easiest way to take target, and convert it to an
arbitrary base (larger than 256)?

Thanks in advance, just starting out with gmp.

Greg

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