Big digit numbers and root

[Selçuk Keskin]

Hi,
i'm studying big digit numbers .i must root a number i write the code like:

	mpz_t n,m;
	mpf_t nf,mf;

	mpz_init_set_str(n,"71641520761751435455133616475667090434063332228247871795429",10);
	mpz_init(m);
	mpf_init(nf);
	mpf_init(mf);

	mpf_init_z(nf,n);
	mpz_sqrt(mf,nf);
	mpz_init_f(m,mf);

it looks it's working at the beginning. But i calculated it at the 
calculator. Results are different. İs there a wrong at library or am i wrong

thanks 


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