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// mpf_template.c : Sample code of mpf_t 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 <stdio.h>
#include "gmp.h"
int main(void)
unsigned long prec;
mpf_t a, b, c; // default precision
mpf_t ad, bd, cd; // larger precsion of a, b and c
printf("Input default prec in bits: "); while(scanf("%ld", &prec) < 1);
// set default precision
mpf_set_default_prec((mp_bitcnt_t)prec); // in bits
// print default precision
printf("default prec in bits: %ld\n", prec);
mpf_init(a); // initialize with default precision
mpf_inits(b, c, NULL); // multiple initialization with default precision
// initialize with twice precsion
mpf_init2(ad, (mp_bitcnt_t)(prec * 2));
mpf_init2(bd, (mp_bitcnt_t)(prec * 2));
mpf_init2(cd, (mp_bitcnt_t)(prec * 2));
// print precision of ad
printf("prec(ad) = %ld\n", mpf_get_prec(ad));
// ---------------------
// variable calculations
// ---------------------
// clear one variable
// clear more than one variables
mpf_clears(b, c, NULL);
mpf_clears(ad, bd, cd, NULL);
return 0;