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cout << "BigUint(\"18431029234558821566\") = " << BigUint("18431029234558821566") << endl;
cout << "BigUint(\"18449999999999999999\") = " << BigUint("18449999999999999999") << endl; // correct
uint64_t A(18449999999999999999);
uint64_t B(18450000000000000000);
cout << "A: " << A << ", B: " << B << endl; // A: 3255926290448383 (= 18449999999999999999 mod 2^64), B: 3255926290448384 (= 18450000000000000000 mod 2^64)
cout << "BigUint(\"18450000000000000000\") = " << BigUint("18450000000000000000") << endl; //BigUint("18450000000000000000") = 3255926290448384
cout << "BigUint(\"18470091734558821566\") = " << BigUint("18470091734558821566") << endl; //BigUint("18470091734558821566") = 23347660849269950
cout << "BigUint(\"18821754234558921567\") = " << BigUint("18821754234558921567") << endl;
cout << "BigUint(\"20479999999999999999\") = " << BigUint("20479999999999999999") << endl; //BigUint("20479999999999999999") = 2033255926290448383
uint64_t C(20479999999999999999);
uint64_t D(20480000000000000000);
cout << "C: " << C << ", D: " << D << endl; // C: 2033255926290448383 (= 20479999999999999999 mod 2^64), D: 2033255926290448384 (= 20480000000000000000 mod 2^64)
cout << "BigUint(\"20480000000000000000\") = " << BigUint("20480000000000000000") << endl; //correct
cout << "BigUint(\"20548786484558921568\") = " << BigUint("20548786484558921568") << endl;

BigUint x("18449999999999999999");
cout << "\nx = " << x << endl;
cout << "x + 1 = " << x + 1 << endl;
BigUint y("18450000000000000000"); // fail
cout << "y = " << y << endl;
BigUint z = x + 1 - y;
cout << "z = " << z << endl;
cout << "y + z = " << y + z << endl; // ok: 18450000000000000000
cout << "y * 50 = " << y * 50 << endl; // ok

//Operators also fail:
cout << BigUint("18821754234558921567") << endl; // fail: 375010160849369951
BigUint a("18821754234558921567");
cout << a * 50 << endl; // fail: 303763968758945934
cout << 50 * a << endl; // fail: 303763968758945934