Merge pull request #372 from DiD92/exercise_structs3

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fmoko 2020-05-03 19:44:26 +02:00 committed by GitHub
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// structs3.rs
// Structs contain more than simply some data, they can also have logic, in this
// exercise we have defined the Package struct and we want to test some logic attached to it,
// make the code compile and the tests pass! If you have issues execute `rustlings hint structs3`
// I AM NOT DONE
#[derive(Debug)]
struct Package {
from: String,
to: String,
weight: f32
}
impl Package {
fn new(from: String, to: String, weight: f32) -> Package {
if weight <= 0.0 {
// Something goes here...
} else {
return Package {from, to, weight};
}
}
fn is_international(&self) -> ??? {
// Something goes here...
}
fn get_fees(&self, cost_per_kg: f32) -> ??? {
// Something goes here...
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
#[should_panic]
fn fail_creating_weightless_package() {
let country_from = String::from("Spain");
let country_to = String::from("Austria");
Package::new(country_from, country_to, -2.21);
}
#[test]
fn create_international_package() {
let country_from = String::from("Spain");
let country_to = String::from("Russia");
let package = Package::new(country_from, country_to, 1.2);
assert!(package.is_international());
}
#[test]
fn calculate_transport_fees() {
let country_from = String::from("Spain");
let country_to = String::from("Spain");
let country_fee = ???;
let package = Package::new(country_from, country_to, 22.0);
assert_eq!(package.get_fees(country_fee), 176.0);
}
}

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@ -241,6 +241,19 @@ Creating instances of structs is easy, all you need to do is assign some values
There is however some shortcuts that can be taken when instantiating structs. There is however some shortcuts that can be taken when instantiating structs.
Have a look in The Book, to find out more: https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html#creating-instances-from-other-instances-with-struct-update-syntax""" Have a look in The Book, to find out more: https://doc.rust-lang.org/stable/book/ch05-01-defining-structs.html#creating-instances-from-other-instances-with-struct-update-syntax"""
[[exercises]]
name = "structs3"
path = "exercises/structs/structs3.rs"
mode = "test"
hint = """
The new method needs to panic if the weight is physically impossible :), how do we do that in Rust?
For is_international: What makes a package international? Seems related to the places it goes through right?
For calculate_transport_fees: Bigger is more expensive usually, we don't have size, but something may fit the bill here :)
Have a look in The Book, to find out more about method implementations: https://doc.rust-lang.org/book/ch05-03-method-syntax.html"""
# STRINGS # STRINGS
[[exercises]] [[exercises]]