# include # include # include using namespace std; int main() { FieldNumber> nf1, nf2; nf1 = 10; nf2 = 20; cout << nf1 + nf2 << '\n'; cout << nf1 - nf2 << '\n'; cout << nf1 * nf2 << '\n'; nf1 += nf2; cout << nf1 << '\n'; nf1 -= nf2; cout << nf1 << '\n'; nf1 *= nf2; cout << nf1 << '\n'; return 0; }