Computer Programming/Objects/C++

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objects.cpp[edit]

#include <iostream>

using namespace std;

// This class converts temperature between Celsius and Fahrenheit.
// It may be used by assigning a value to either Celsius or Fahrenheit 
// and then retrieving the other value, or by calling the ToCelsius or
// ToFahrenheit methods directly.

class Temperature
{
    public:
        double getCelsius(void);
        void setCelsius(double value);
        double getFahrenheit(void);
        void setFahrenheit(double value);
        double toCelsius(double fahrenheit);
        double toFahrenheit(double celsius);
    
    private:
        double celsius;
        double fahrenheit;
};

double Temperature::getCelsius(void)
{
    return celsius;
}

void Temperature::setCelsius(double value)
{
    celsius = value;
    fahrenheit = toFahrenheit(celsius);
}

double Temperature::getFahrenheit(void)
{
    return fahrenheit;
}

void Temperature::setFahrenheit(double value)
{
    fahrenheit = value;
    celsius = toCelsius(fahrenheit);
}
    
double Temperature::toCelsius(double fahrenheit)
{
    return (fahrenheit - 32) * 5 / 9;
}

double Temperature::toFahrenheit(double celsius)
{
    return celsius * 9 / 5 + 32;
}

// This program creates instances of the Temperature class to convert Cesius 
// and Fahrenheit temperatures.

int main()
{
    Temperature temp1;
    temp1.setCelsius(100.0);
    cout << "temp1.celsius = " << temp1.getCelsius() << endl;
    cout << "temp1.fahrenheit = " << temp1.getFahrenheit() << endl;
    cout << endl;
    
    Temperature temp2;
    temp2.setFahrenheit(100.0);
    cout << "temp2.fahrenheit = " << temp2.getFahrenheit() << endl;
    cout << "temp2.celsius = " << temp2.getCelsius() << endl;
}

Try It[edit]

Copy and paste the code above into one of the following free online development environments or use your own C++ compiler / interpreter / IDE.

See Also[edit]