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360344ab6c
Conversion between Celsius and Fahrenheit should be understandable to most. Inverting the formula is still not very hard, but a little harder than only multiplying by 100.
55 lines
1.4 KiB
Rust
55 lines
1.4 KiB
Rust
// The `From` trait is used for value-to-value conversions. If `From` is
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// implemented, an implementation of `Into` is automatically provided.
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// You can read more about it in the documentation:
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// https://doc.rust-lang.org/std/convert/trait.From.html
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//
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// Representing units of measurements with separate types is a common practice.
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// It avoids accidentally mixing up values of different units of measurement.
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struct Celsius(f64);
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struct Fahrenheit(f64);
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impl From<Celsius> for Fahrenheit {
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// TODO: Convert Celsius to Fahrenheit. Don't worry about floating-point
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// precision. The formula is: F = C * 1.8 + 32
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}
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impl From<Fahrenheit> for Celsius {
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// TODO: Convert Fahrenheit to Celsius.
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}
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fn main() {
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// You can optionally experiment here.
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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const CASES: [(f64, f64); 6] = [
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(-50.0, -58.0),
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(0.0, 32.0),
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(20.0, 68.0),
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(100.0, 212.0),
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(400.0, 752.0),
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(1000.0, 1832.0),
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];
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#[test]
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fn celsius_to_fahrenheit() {
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for (celsius, fahrenheit) in CASES {
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let Fahrenheit(actual) = Celsius(celsius).into();
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assert_eq!(actual.round(), fahrenheit);
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}
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}
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#[test]
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fn fahrenheit_to_celsius() {
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for (celsius, fahrenheit) in CASES {
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let Celsius(actual) = Fahrenheit(fahrenheit).into();
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assert_eq!(actual.round(), celsius);
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}
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}
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}
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