Question

In this program Iam trying to take 78 degrees Fahrenheit and return them in a class with the Celsius version and kelvin. But for some odd reason I’m just getting this as the output. What am I doing wrong?

This is my output.

78
0
273.15

#include <iostream>
using namespace std;


class Temperature
{
public:

    double getTempKelvin();
    double getTempFahrenheit();
    double getTempCelcius();

    void setTempKelvin(double k);
    void setTempFahrenheit(double f);
    void setTempCelcius(double c);

private:
    double kelvin, fahrenheit, celcius;
    double c, f, k;
};

int main ()
{
    double c, f, k;
    Temperature Conv;

    Conv.setTempFahrenheit(f);
    Conv.setTempCelcius(c);
    Conv.setTempKelvin(k);
    cout << Conv.getTempFahrenheit() << endl;
    cout << Conv.getTempCelcius() << endl;
    cout << Conv.getTempKelvin() << endl;



    return 0;
}

void Temperature::setTempFahrenheit(double f)
{
    f = 78;
    fahrenheit = f;
}

void Temperature::setTempCelcius(double c)
{
    c = (5/9) * ( f - 32);
    celcius = c;
}

void Temperature::setTempKelvin(double k)
{
    k = c + 273.15;
    kelvin = k;
}




double Temperature::getTempFahrenheit()
{
    return fahrenheit;
}

double Temperature::getTempCelcius()
{
    return celcius;
}


double Temperature::getTempKelvin()
{
    return kelvin;
}

Answer 1

5/9 is integer division and will result in 0. You need to use doubles, Try:

void Temperature::setTempCelcius(double c)
{
    c = (5.0/9.0) * ( f - 32);
    celcius = c;
}