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/*
Copyright (C) 2022 Fredrik Johansson
This file is part of FLINT.
FLINT is free software: you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License (LGPL) as published
by the Free Software Foundation; either version 3 of the License, or
(at your option) any later version. See <https://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <gmp.h>
#include <flint/flint.h>
#include <flint/fmpz.h>
#include <flint/fmpz_factor.h>
#include <flint/gr.h>
#include <flint/profiler.h>
int
main(int argc, char * argv[])
{
fmpz_t n;
fmpz_factor_t fac;
slong i;
int num_threads = 1;
int timing = 0;
if (argc < 2)
{
flint_printf("usage: factor_integer [-threads t] [-timing] n\n");
flint_printf("n can be given as an expression (no spaces)\n");
return 1;
}
fmpz_init(n);
for (i = 1; i < argc; i++)
{
if (!strcmp(argv[i], "-threads"))
{
num_threads = atoi(argv[i+1]);
flint_set_num_threads(num_threads);
i++;
}
else if (!strcmp(argv[i], "-timing"))
{
timing = 1;
}
else
{
/* allow expression input like "2^64+1" */
{
gr_ctx_t ZZ;
gr_ctx_init_fmpz(ZZ);
if (gr_set_str(n, argv[i], ZZ) != GR_SUCCESS)
{
flint_printf("unable to parse integer\n");
return 1;
}
gr_ctx_clear(ZZ);
}
}
}
fmpz_factor_init(fac);
if (timing)
{
TIMEIT_START;
fmpz_factor(fac, n);
TIMEIT_STOP;
print_memory_usage();
}
else
{
fmpz_factor(fac, n);
}
fmpz_print(n);
flint_printf(" =\n");
if (fac->sign != 1 || fac->num == 0)
{
flint_printf("%d", fac->sign);
if (fac->num > 0)
flint_printf(" * ");
}
for (i = 0; i < fac->num; i++)
{
fmpz_print(fac->p + i);
if (fac->exp[i] >= 2)
flint_printf("^%lu", fac->exp[i]);
if (i < fac->num - 1)
flint_printf(" * ");
}
flint_printf("\n");
fmpz_factor_clear(fac);
fmpz_clear(n);
flint_cleanup_master();
return 0;
}
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