4 to 6 excercises

exercises/04_primitive_types/primitive_types1.rs

@@ -9,6 +9,7 @@ fn main() {
     // TODO: Define a boolean variable with the name `is_evening` before the `if` statement below.
     // The value of the variable should be the negation (opposite) of `is_morning`.
     // let …
+    let is_evening = !is_morning;
     if is_evening {
         println!("Good evening!");
     }

exercises/04_primitive_types/primitive_types2.rs

@@ -17,7 +17,7 @@ fn main() {
     // Try a letter, try a digit (in single quotes), try a special character, try a character
     // from a different language than your own, try an emoji 😉
     // let your_character = '';
-
+    let your_character = '😊';
     if your_character.is_alphabetic() {
         println!("Alphabetical!");
     } else if your_character.is_numeric() {

exercises/04_primitive_types/primitive_types3.rs

@@ -1,7 +1,7 @@
 fn main() {
     // TODO: Create an array called `a` with at least 100 elements in it.
     // let a = ???
-
+    let a = [0; 100];
     if a.len() >= 100 {
         println!("Wow, that's a big array!");
     } else {

exercises/04_primitive_types/primitive_types4.rs

@@ -10,6 +10,7 @@ mod tests {
 
         // TODO: Get a slice called `nice_slice` out of the array `a` so that the test passes.
         // let nice_slice = ???
+        let nice_slice = &a[1..4];
 
         assert_eq!([2, 3, 4], nice_slice);
     }

exercises/04_primitive_types/primitive_types5.rs

@@ -3,6 +3,7 @@ fn main() {
 
     // TODO: Destructure the `cat` tuple in one statement so that the println works.
     // let /* your pattern here */ = cat;
+    let (name, age) = cat;
 
     println!("{name} is {age} years old");
 }

exercises/04_primitive_types/primitive_types6.rs

@@ -11,6 +11,7 @@ mod tests {
         // TODO: Use a tuple index to access the second element of `numbers`
         // and assign it to a variable called `second`.
         // let second = ???;
+        let second = numbers.1;
 
         assert_eq!(second, 2, "This is not the 2nd number in the tuple!");
     }

exercises/05_vecs/vecs1.rs

@@ -4,6 +4,7 @@ fn array_and_vec() -> ([i32; 4], Vec<i32>) {
     // TODO: Create a vector called `v` which contains the exact same elements as in the array `a`.
     // Use the vector macro.
     // let v = ???;
+    let v = vec![10, 20, 30, 40]; // Vector
 
     (a, v)
 }

exercises/05_vecs/vecs2.rs

@@ -4,6 +4,7 @@ fn vec_loop(input: &[i32]) -> Vec<i32> {
     for element in input {
         // TODO: Multiply each element in the `input` slice by 2 and push it to
         // the `output` vector.
+        output.push(element * 2);
     }
 
     output

exercises/06_move_semantics/move_semantics1.rs

@@ -1,6 +1,6 @@
 // TODO: Fix the compiler error in this function.
 fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
-    let vec = vec;
+    let mut vec = vec;
 
     vec.push(88);
 

exercises/06_move_semantics/move_semantics2.rs

@@ -20,7 +20,7 @@ mod tests {
     fn move_semantics2() {
         let vec0 = vec![22, 44, 66];
 
-        let vec1 = fill_vec(vec0);
+        let vec1 = fill_vec(vec0.clone());
 
         assert_eq!(vec0, [22, 44, 66]);
         assert_eq!(vec1, [22, 44, 66, 88]);

exercises/06_move_semantics/move_semantics3.rs

@@ -1,5 +1,5 @@
 // TODO: Fix the compiler error in the function without adding any new line.
-fn fill_vec(vec: Vec<i32>) -> Vec<i32> {
+fn fill_vec(mut vec: Vec<i32>) -> Vec<i32> {
     vec.push(88);
 
     vec

exercises/06_move_semantics/move_semantics4.rs

@@ -9,10 +9,13 @@ mod tests {
     #[test]
     fn move_semantics4() {
         let mut x = Vec::new();
+        
         let y = &mut x;
-        let z = &mut x;
         y.push(42);
+        let z = &mut x;
         z.push(13);
+        
+
         assert_eq!(x, [42, 13]);
     }
 }

exercises/06_move_semantics/move_semantics5.rs

@@ -9,7 +9,7 @@ fn get_char(data: String) -> char {
 }
 
 // Should take ownership
-fn string_uppercase(mut data: &String) {
+fn string_uppercase(mut data: String) {
     data = data.to_uppercase();
 
     println!("{data}");
@@ -18,7 +18,7 @@ fn string_uppercase(mut data: &String) {
 fn main() {
     let data = "Rust is great!".to_string();
 
-    get_char(data);
+    get_char(data.clone());
 
-    string_uppercase(&data);
+    string_uppercase(data);
 }

exercises/quizzes/quiz1.rs

@@ -12,6 +12,14 @@
 // the quantity bought.
 // fn calculate_price_of_apples(???) -> ??? { ??? }
 
+fn calculate_price_of_apples(quantity: i32) -> i32 {
+    if quantity > 40 {
+        quantity
+    } else {
+        quantity * 2
+    }
+}
+
 fn main() {
     // You can optionally experiment here.
 }