#include "libft.h"

/**
 * Splits a double into its integer and fractional parts,
 * it returns the fractional part,
 * and stores the integer part in the in_part param (if not null)
 * e.g.:
 *  -3.7 → -3.0 and -0.7 (returns -0.7)
 */
double ft_modf(double x, double *int_part)
{
	// extract the integer part by casting to long long
	long long integer = (long long)x;
	if (int_part != NULL)
	{
		*int_part = (double)integer;
	}

	// compute the fractional part
	double frac_part = x - *int_part;

	return frac_part;
}