rustlings: complete 03

1 files changed, 28 insertions, 2 deletions

diff --git a/rustlings/solutions/quizzes/quiz1.rs b/rustlings/solutions/quizzes/quiz1.rs
index dcf2377..5503c8c 100644
--- a/rustlings/solutions/quizzes/quiz1.rs
+++ b/rustlings/solutions/quizzes/quiz1.rs
@@ -1,4 +1,30 @@
+// Mary is buying apples. The price of an apple is calculated as follows:
+// - An apple costs 2 rustbucks.
+// - However, if Mary buys more than 40 apples, the price of each apple in the
+// entire order is reduced to only 1 rustbuck!
+
+fn calculate_price_of_apples(n_apples: u64) -> u64 {
+    if n_apples > 40 {
+        n_apples
+    } else {
+        2 * n_apples
+    }
+}
+
 fn main() {
-    // DON'T EDIT THIS SOLUTION FILE!
-    // It will be automatically filled after you finish the exercise.
+    // You can optionally experiment here.
+}
+
+// Don't change the tests!
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn verify_test() {
+        assert_eq!(calculate_price_of_apples(35), 70);
+        assert_eq!(calculate_price_of_apples(40), 80);
+        assert_eq!(calculate_price_of_apples(41), 41);
+        assert_eq!(calculate_price_of_apples(65), 65);
+    }
 }