Although the Standard Library doesn’t define functions that convert Fahrenheit degrees to Celsius degrees and vice versa, you can implement them by yourself. These functions are particularly useful in localization and internationalization projects. You may also find them useful in any international weather report Web site. Here are the two conversion functions:
double to_celsius(double fahr){ return 5.0/9.0*(fahr-32.0);}double to_fahrenheit(double cel){ return 9.0/5.0*cel+32.0;}
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