65 lines
1.8 KiB
Rust
65 lines
1.8 KiB
Rust
// quiz3.rs
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//
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// This quiz tests:
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// - Generics
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// - Traits
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//
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// An imaginary magical school has a new report card generation system written
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// in Rust! Currently the system only supports creating report cards where the
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// student's grade is represented numerically (e.g. 1.0 -> 5.5). However, the
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// school also issues alphabetical grades (A+ -> F-) and needs to be able to
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// print both types of report card!
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//
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// Make the necessary code changes in the struct ReportCard and the impl block
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// to support alphabetical report cards. Change the Grade in the second test to
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// "A+" to show that your changes allow alphabetical grades.
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//
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// Execute `rustlings hint quiz3` or use the `hint` watch subcommand for a hint.
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pub struct ReportCard<T> {
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pub grade: T,
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pub student_name: String,
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pub student_age: u8,
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}
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impl<T: std::fmt::Display> ReportCard<T> {
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pub fn print(&self) -> String {
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format!(
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"{} ({}) - achieved a grade of {}",
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&self.student_name, &self.student_age, &self.grade
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)
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}
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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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#[test]
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fn generate_numeric_report_card() {
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let report_card = ReportCard {
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grade: 2.1,
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student_name: "Tom Wriggle".to_string(),
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student_age: 12,
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};
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assert_eq!(
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report_card.print(),
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"Tom Wriggle (12) - achieved a grade of 2.1"
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);
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}
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#[test]
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fn generate_alphabetic_report_card() {
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// TODO: Make sure to change the grade here after you finish the exercise.
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let report_card = ReportCard {
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grade: String::from("A+"),
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student_name: "Gary Plotter".to_string(),
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student_age: 11,
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};
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assert_eq!(
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report_card.print(),
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"Gary Plotter (11) - achieved a grade of A+"
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);
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}
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}
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