Merge pull request #16 from Joaopmorais/Quiz3

quiz 3

exercises/quiz3.rs

@@ -16,15 +16,16 @@
 //
 // Execute `rustlings hint quiz3` or use the `hint` watch subcommand for a hint.
 
-// I AM NOT DONE
 
-pub struct ReportCard {
-    pub grade: f32,
+use std::fmt::Display;
+
+pub struct ReportCard<T> {
+    pub grade: T,
     pub student_name: String,
     pub student_age: u8,
 }
 
-impl ReportCard {
+impl <T: Display> ReportCard<T> {
     pub fn print(&self) -> String {
         format!("{} ({}) - achieved a grade of {}",
             &self.student_name, &self.student_age, &self.grade)
@@ -34,7 +35,7 @@ impl ReportCard {
 #[cfg(test)]
 mod tests {
     use super::*;
-
+    
     #[test]
     fn generate_numeric_report_card() {
         let report_card = ReportCard {
@@ -52,7 +53,7 @@ mod tests {
     fn generate_alphabetic_report_card() {
         // TODO: Make sure to change the grade here after you finish the exercise.
         let report_card = ReportCard {
-            grade: 2.1,
+            grade: "A+",
             student_name: "Gary Plotter".to_string(),
             student_age: 11,
         };