Exercise · Variables and Types · lesson 6 of 10

Exercise: temperature conversion

Write two functions: double to_fahrenheit(double c) converts a temperature from degrees Celsius to degrees Fahrenheit, and double to_celsius(double f) converts it back. The scales are related by the formulas F = C × 1.8 + 32 and C = (F − 32) × 5/9. The factors kFahrenheitPerCelsius (1.8) and kCelsiusPerFahrenheit (5.0 / 9.0) are already defined in the file.

to_fahrenheit(100.0) → 212.0
to_fahrenheit(-40.0) → -40.0
to_celsius(32.0) → 0.0

Constraints: the temperature is not below absolute zero (−273.15 °C), and the result is compared with the expected value to within 1e-9.

temperature.cpp — cpp

cpp · 11 lines

constexpr double kFahrenheitPerCelsius = 1.8;
constexpr double kCelsiusPerFahrenheit = 5.0 / 9.0;

double to_fahrenheit(double c) {
    return -1.0;
}

double to_celsius(double f) {
    return -1.0;
}

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