public static void Main()
{
frac c1 = new frac(4, 5);
frac c2 = new frac(1, 2);
frac c3 = new frac(1, 2);
int c4 = 1;
frac c5 = new frac(1, 5);
frac S = new frac(0, 1);
frac S1 = new frac(0, 1);
frac S2 = new frac(0, 1);
frac S20 = new frac(0, 1);
frac S3 = new frac(0, 1);
frac S4 = new frac(0, 1);
S1 = S1.addition(c2, c3);
S1.print();
S2 = S2.frac_subt_int(c5, c4);
S20 = S20.multiplication_int(S2, -1);
S20.print();
S3 = S3.multiplication(S1, S20);
S3.print();
S4 = c1.pow(2);
S4.print();
S = S.multiplication(S3, c1.pow(2));
S.print();
}
public static IEnumerable <frac> Combine(frac a, frac b)
{
yield return(a * b);
yield return(a + b);
if (b.n != 0)
{
yield return(a / b);
}
yield return(a - b);
}
