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// mpf_template.cpp : Sample code of mpf_class variables
// Copyright (C) 2019 Tomonori Kouya
// This program is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published by the
// Free Software Foundation, either version 3 of the License or any later
// version.
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
// for more details.
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <>.
#include <iostream>
#include <iomanip>
#include "gmpxx.h"
using namespace std;
int main(void)
unsigned long prec;
cout << "Input default prec in bits: "; cin >> prec;
// set default precision
mpf_set_default_prec((mp_bitcnt_t)prec); // in bits
mpf_class a, b, c; // default precision
mpf_class ad, bd, cd; // default precision
// print default precision
cout << "default prec in bits: " << prec << endl;
// change twice precision for ad, bd, and cd
ad.set_prec((mp_bitcnt_t)(prec * 2));
bd.set_prec((mp_bitcnt_t)(prec * 2));
cd.set_prec((mp_bitcnt_t)(prec * 2));
// print each precision of variable
cout << "prec(ad) = " << ad.get_prec() << endl;
// calculations
// delete one variable
delete a; // single
// delete variables
delete b, c;
delete ad, bd, cd;
return 0;