//
// divide la frazione f1 per la frazione f2
//
t_fraction fraction_div(t_fraction f1, t_fraction f2) {
t_fraction f = fraction_create(f1.numerator * f2.denominator, f1.denominator * f2.numerator);
fraction_reduce(&f);
return f;
}
//
// crea una frazione da un double
//
t_fraction fraction_fromdouble(double d) {
int num;
int den;
if(!fraction_isdecimal(d))
{
num = (d > INT_MAX) ? INT_MAX : d;
den = 1;
}
else
{
int max = 9;
int m = 1;
while(fraction_isdecimal(d) && max > 0)
{
--max;
m *= 10;
d = d * 10.0;
}
num = (d > INT_MAX) ? INT_MAX : d;
den = m;
}
// crea la frazione
t_fraction f = fraction_create(num, den);
// riduce ai minimi termini
fraction_reduce(&f);
return f;
};
struct fraction fraction_div(struct fraction a, struct fraction b)
{
struct fraction r;
r.nume = a.nume*b.deno;
r.deno = a.deno*b.nume;
fraction_reduce(&r);
return r;
}
//
// sottrae le frazioni f1 e f2
//
t_fraction fraction_sub(t_fraction f1, t_fraction f2) {
assert(f1.denominator != 0);
assert(f2.denominator != 0);
int lcm = fraction_lcm(f1.denominator, f2.denominator);
int num = (f1.numerator * lcm / f1.denominator) - (f2.numerator * lcm / f2.denominator);
t_fraction f = fraction_create(num, lcm);
fraction_reduce(&f);
return f;
}
