Rationale Zahlen, C (gcc)

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//Title of this code

#include <iostream>

using namespace std;

class Q{

double zahler;
    double nenner;
    double div;

public:

Q(double x=0, double y=1){
        init(x, y);
    }

void init(double z, double n){
        zahler=z;
        if(n!=0)
            nenner=n;
        else
            nenner=1;
    }

double wert(){
        if(zahler==0 && nenner==0){
            //cout << "Double Wert ist: 0" << endl;
        }else{
            div=zahler/nenner;
            //cout << "Double Wert ist: " << div << endl;
            return div;
        }
    }

int ggt(int a, int b){
        if(a<b){
            int temp=a;
            a=b;
            b=temp;
        }

if(b==0)
            return a;
        else
            return ggt(b, a%b);
    }

void kuerzen(double zKuerzen, double nKuerzen){
        zahler=zKuerzen/ggt(zKuerzen,nKuerzen);
        nenner=nKuerzen/ggt(zKuerzen,nKuerzen);
    }

void print(){
        kuerzen(zahler,nenner);
        cout << "Bruchform der Zahl ist: " << zahler << "/" << nenner << endl;
    }

Q operator+(Q amount);
    friend std::ostream& operator<<(std::ostream& stream, Q p);

};

Q Q::operator+(Q amount){
        return Q(this->zahler+amount.wert());
    }

std::ostream& operator<<(std::ostream& stream, Q p) {
    stream << p.wert() << std::endl;
    return stream;
}

int main()
{
    Q a;
    Q b=10;
    Q c(3,9);

a.print();
    b.print();
    c.print();

a.wert();
    b.wert();
    c.wert();

Q d=a+b;

cout << d;
    
    return 0;
}

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Compilation time: 0.04 sec, absolute service time: 0.21 sec