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Tyler Pruden Jin2188's questions

Martin Hope
Tyler Pruden Jin2188
Asked: 2025-04-08 08:00:54 +0800 CST
  • 5

Recebo esse erro mesmo tendo sobrecarregado o operador <<.

Meu protótipo é o seguinte, colocado dentro do arquivo de cabeçalho da classe Fraction.

friend std::ostream& operator << (std::ostream&, Fraction&);

Minha função sobrecarregada é a seguinte:

    std::ostream& operator << (std::ostream &output, Fraction &f1)
    {
        if(f1.denominator == 1){
            output << f1.numerator;
        }
        if(abs(f1.numerator) >= f1.denominator){
            if(f1.numerator % f1.denominator == 0){
                output << f1.numerator / f1.denominator;
            }
            else {
                Fraction f2(f1.numerator % f1.denominator, f1.denominator);
                f2.simplify();
                output << f1.numerator / f1.denominator << "+" << f2.numerator << "/" << f2.denominator;
            }
        }
        else {
            output << f1.numerator << "/" << f1.denominator;
        }
        return output;
    }

Esta é a função onde recebo o erro:

void BasicTest()
{
    cout << "***********************************************************************\n";
    cout << "* Basic Test: Testing member constructor, simplify() and nonmember    *\n";
    cout << "* friend ostream << operator for basic Fraction object creation &     *\n";
    cout << "* printing(Fractions should be in reduced form, and as mixed numbers.)*\n";
    cout << "***********************************************************************\n";

    const Fraction fr[] = {Fraction(4, 8), Fraction(-15,21),
                           Fraction(10), Fraction(12, -3),
                           Fraction(), Fraction(28, 6), Fraction(0, 12)};

    for (int i = 0; i < 7; i++){
        cout << "Fraction [" << i <<"] = " << fr[i] << endl; // This is where I get the error
    }

    cout << "\n***********************************************************************\n";
    cout << "* Basic Test: Testing simplify() and nonmember friend istream >> and  *\n";
    cout << "* ostream << operators for reading and display of Fraction objects    *\n";
    cout << "* from data file                                                      *\n";
    cout << "***********************************************************************\n";

    string fileName;

    cout << "Enter file name with fraction data to read: ";
    cin >> fileName;

    ifstream in(fileName);

    while(!in)
    {
        cin.ignore(200, '\n');
        cout << fileName << " not found!" <<endl;
        cout << "Make sure the fraction data file to read is in the project folder." << endl;
        cout << "Enter file name with fraction data to read: ";
        cin >> fileName;
        in.open(fileName);
    }

    while (!eof(in)) {
        Fraction f;
        if(in.peek() == '/' || in.peek() == '*' || isalpha(in.peek()) ){
            in.ignore(200, '\n');   //skip this line, it's a comment
        } else {
            in >> f;
            cout << "Read Fraction = " << f << endl;
        }
    }
}

Realmente não tenho ideia do que possa estar errado, nem sei por onde começar. Sou iniciante em C++ e Programação Orientada a Objetos, então se alguém puder identificar o problema, seria de grande ajuda.

c++