/* Octal Numbers sample implementation Input validation not done */ #include #include #include using namespace std; class OctalNumber { public: OctalNumber() = default; OctalNumber(char const* str) :OctalNumber((string)str) {} OctalNumber(string const& num) : m_whole(num), m_frac{""} { auto pos = num.find('.'); if(pos != string::npos) { // store whole part and fraction // part separately. It's easier // to handle this way m_whole = num.substr(0,pos); m_frac = num.substr(pos+1); } } ~OctalNumber() = default; // convert to string operator operator string () const { return m_whole + (!m_frac.empty() ? ('.' + m_frac) : ""); } string getWhole() const { return m_whole; } string getFrac() const { return m_frac; } private: friend OctalNumber operator + (OctalNumber const&, OctalNumber const&); string m_whole; string m_frac; }; // Helper for adding strings, converts // to octal and takes care of carry string Adder(string const& lhs, string const& rhs, int& carry, bool isfrac=true) { string res, addtores; lhs.size() >= rhs.size() ? (res = lhs, addtores = rhs): (res = rhs, addtores = lhs); addtores = string(res.size()-addtores.size(), '0') + addtores; transform(rbegin(addtores), rend(addtores), rbegin(res), rbegin(res), [&](char t, char b) { int sum = t - '0' + b - '0' + carry; if(sum > 7){ sum -= 8; carry = 1; } else carry = 0; return sum + '0'; }); return res; } OctalNumber operator + (OctalNumber const& lhs, OctalNumber const& rhs) { int carry{0}; // add fraction part first string frac = Adder(lhs.getFrac(), rhs.getFrac(), carry); // add whole part string whole = Adder(lhs.getWhole(), rhs.getWhole(), carry, false); return OctalNumber(carry ? (to_string(carry)+whole+'.'+frac): (whole+'.'+frac)); } int main() { OctalNumber o1("12.221"); OctalNumber o2("3.11"); cout << (string)o1 << " + " << (string)o2 << " + " << (string)o1 << " = " << (string)(o1 + o2 + o1); cout << "\n\n"; cout << (string)o2 << " + " << "2.22" << " = " << (string)(o2 + "2.22"); cout << "\n\n"; // the type of "3.22" is char const[5] // it uses OctalNumber(char const*) // constructor cout << "3.22" << " + " << (string)o1 << " = " << (string)("3.22" + o1); cout << "\n\n"; // the type of "0.4467"s is std::string // it uses OctalNumber(string const&) // constructor cout << "0.4467" << " + " << (string)o2 << " = " << (string)("0.4467"s + o2); cout << "\n\n"; OctalNumber o3{"3"}; cout << "5" << " + " << (string)o3 << " = " << (string)("5" + o3) << endl << endl; return 0; }

OctalNumbers.cpp