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Класс Rational с перегрузкой и исключениями
Время создания: 16.08.2017 14:45
Раздел: Computer - Programming - C++ - Coursera White_Belt

#include <iostream>

#include <sstream>

#include <vector>

#include <set>

#include <map>

#include <exception>


using namespace std;


int Divider(const int& n, const int& d) {

if(n == d)

{

return n;

}

else if(n == 0)

{

return n;

}

else

{

int dividend_t = 0;

int divider_t = 0;

int reminder = 0;


if(n > d)

{

dividend_t = n;

divider_t = d;

}

else

{

dividend_t = d;

divider_t = n;

}


reminder = dividend_t % divider_t;

while(reminder != 0)

{

dividend_t = divider_t;

divider_t = reminder;

reminder = dividend_t % divider_t;

}

if(divider_t < 0)

return -divider_t;

else return divider_t;

}


}


class Rational {

public:

Rational() {

p = 0;

q = 1;

}


Rational(int numerator, int denominator) {

if(denominator == 0)

{

throw invalid_argument("R u fckn srsly?!");

}

else Initialize(numerator, denominator);

}


void Initialize(const int& n, const int& d)

{

p = n;

q = d;

SignedFactional();

}


void SignedFactional()

{

if(p == 0)

{

q = 1;

}

else

{

if(q < 0)

{

p = -p;

q = -q;

}

int divider = Divider(p, q);

p /= divider;

q /= divider;

}

}



int Numerator() const {

return p;

}


int Denominator() const {

return q;

}


const bool operator == (const Rational& a) const

{

if((a.p == p))

return true;

else return false;

}

const bool operator > (const Rational& a) const

{

if((p * a.q) > (q * a.p))

return true;

else return false;

}

const bool operator < (const Rational& a) const

{

if((p * a.q) < (q * a.p))

return true;

else return false;

}

Rational operator + (const Rational& x)

{

Rational result;

if(x.q == q)

{

result.p = x.p + p;

result.q = x.q;

}

else

{

result.p = (x.p * q) + (p * x.q);

result.q = x.q * q;

}

result.SignedFactional();

return result;

}

Rational operator - (const Rational& x)

{

Rational result;

if(x.q == q)

{

result.p = p - x.p;

result.q = x.q;

}

else

{

result.p = (p * x.q) - (x.p * q);

result.q = x.q * q;

}

result.SignedFactional();

return result;

}

private:

int p;

int q;

};




istream& operator >> (istream& stream, Rational& r)

{

int p_t, q_t;

stream >> p_t;

stream.ignore(1); //ignore '/'

stream >> q_t;

r.Initialize(p_t, q_t);

return stream;

}


ostream& operator << (ostream& stream, const Rational& r)

{

stream << r.Numerator() << '/' << r.Denominator();

return stream;

}


Rational operator * (const Rational& left, const Rational& right)

{

Rational result;

result.Initialize(

(right.Numerator() * left.Numerator()),

(right.Denominator() * left.Denominator())

);

return result;

}


Rational operator / (const Rational& left, const Rational& right)

{

if(right.Numerator() == 0)

{

throw domain_error("WTF?");

}

else

{

Rational result;

result.Initialize(

(left.Numerator() * right.Denominator()),

(left.Denominator() * right.Numerator())

);

return result;

}

}


int main() {

try {

Rational r(1, 0);

cout << "Doesn't throw in case of zero denominator" << endl;

return 1;

} catch (invalid_argument&) {

}

try {

auto x = Rational(1, 2) / Rational(0, 1);

cout << "Doesn't throw in case of division by zero" << endl;

return 2;

} catch (domain_error&) {

}

cout << "OK" << endl;

getchar();

return 0;

}

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