27.9.3: C++ Examples
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// 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. // // References: // https://www.mathsisfun.com/temperature-conversion.html // https://en.wikibooks.org/wiki/C%2B%2B_Programming #include <iostream> using namespace std; 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 Celsius // and Fahrenheit temperatures. // // References: // https://www.mathsisfun.com/temperature-conversion.html // https://en.wikibooks.org/wiki/C%2B%2B_Programming 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; }
temp1.celsius = 100 temp1.fahrenheit = 212 temp2.fahrenheit = 100 temp2.celsius = 37.7778