Completed till exercise 4

22 files changed, 31 insertions, 20 deletions

diff --git a/exercises/00_intro/intro2.rs b/exercises/00_intro/intro2.rs
index c6cb645..03e376e 100644
--- a/exercises/00_intro/intro2.rs
+++ b/exercises/00_intro/intro2.rs
@@ -1,4 +1,4 @@
 fn main() {
     // TODO: Fix the code to print "Hello world!".
-    printline!("Hello world!");
+    println!("Hello world!");
 }
diff --git a/exercises/01_variables/variables1.rs b/exercises/01_variables/variables1.rs
index f83b44d..ec1bcac 100644
--- a/exercises/01_variables/variables1.rs
+++ b/exercises/01_variables/variables1.rs
@@ -1,6 +1,6 @@
 fn main() {
     // TODO: Add the missing keyword.
-    x = 5;
+    let x = 5;
 
     println!("x has the value {x}");
 }
diff --git a/exercises/01_variables/variables2.rs b/exercises/01_variables/variables2.rs
index e2a3603..e2fd5d0 100644
--- a/exercises/01_variables/variables2.rs
+++ b/exercises/01_variables/variables2.rs
@@ -1,6 +1,6 @@
 fn main() {
     // TODO: Change the line below to fix the compiler error.
-    let x;
+    let x = 10;
 
     if x == 10 {
         println!("x is ten!");
diff --git a/exercises/01_variables/variables3.rs b/exercises/01_variables/variables3.rs
index 06f35bb..45a8586 100644
--- a/exercises/01_variables/variables3.rs
+++ b/exercises/01_variables/variables3.rs
@@ -1,6 +1,6 @@
 fn main() {
     // TODO: Change the line below to fix the compiler error.
-    let x: i32;
+    let x: i32 = 10;
 
     println!("Number {x}");
 }
diff --git a/exercises/01_variables/variables4.rs b/exercises/01_variables/variables4.rs
index 6c138b1..90d4ef0 100644
--- a/exercises/01_variables/variables4.rs
+++ b/exercises/01_variables/variables4.rs
@@ -1,6 +1,6 @@
 // TODO: Fix the compiler error.
 fn main() {
-    let x = 3;
+    let mut x = 3;
     println!("Number {x}");
 
     x = 5; // Don't change this line
diff --git a/exercises/01_variables/variables5.rs b/exercises/01_variables/variables5.rs
index cf5620d..085e099 100644
--- a/exercises/01_variables/variables5.rs
+++ b/exercises/01_variables/variables5.rs
@@ -3,6 +3,6 @@ fn main() {
     println!("Spell a number: {number}");
 
     // TODO: Fix the compiler error by changing the line below without renaming the variable.
-    number = 3;
+    let number = 3;
     println!("Number plus two is: {}", number + 2);
 }
diff --git a/exercises/01_variables/variables6.rs b/exercises/01_variables/variables6.rs
index 4a040fd..deb33ed 100644
--- a/exercises/01_variables/variables6.rs
+++ b/exercises/01_variables/variables6.rs
@@ -1,5 +1,5 @@
 // TODO: Change the line below to fix the compiler error.
-const NUMBER = 3;
+const NUMBER: i32 = 3;
 
 fn main() {
     println!("Number: {NUMBER}");
diff --git a/exercises/02_functions/functions1.rs b/exercises/02_functions/functions1.rs
index a812c21..ba37396 100644
--- a/exercises/02_functions/functions1.rs
+++ b/exercises/02_functions/functions1.rs
@@ -3,3 +3,7 @@
 fn main() {
     call_me(); // Don't change this line
 }
+
+fn call_me() {
+    println!("Hello");
+}
diff --git a/exercises/02_functions/functions2.rs b/exercises/02_functions/functions2.rs
index 2c773c6..a2cffc1 100644
--- a/exercises/02_functions/functions2.rs
+++ b/exercises/02_functions/functions2.rs
@@ -1,5 +1,5 @@
 // TODO: Add the missing type of the argument `num` after the colon `:`.
-fn call_me(num:) {
+fn call_me(num: i32) {
     for i in 0..num {
         println!("Ring! Call number {}", i + 1);
     }
diff --git a/exercises/02_functions/functions3.rs b/exercises/02_functions/functions3.rs
index 8d65477..845a1b4 100644
--- a/exercises/02_functions/functions3.rs
+++ b/exercises/02_functions/functions3.rs
@@ -6,5 +6,5 @@ fn call_me(num: u8) {
 
 fn main() {
     // TODO: Fix the function call.
-    call_me();
+    call_me(4);
 }
diff --git a/exercises/02_functions/functions4.rs b/exercises/02_functions/functions4.rs
index b22bffd..c1e078c 100644
--- a/exercises/02_functions/functions4.rs
+++ b/exercises/02_functions/functions4.rs
@@ -8,7 +8,7 @@ fn is_even(num: i64) -> bool {
 }
 
 // TODO: Fix the function signature.
-fn sale_price(price: i64) -> {
+fn sale_price(price: i64) -> i64 {
     if is_even(price) {
         price - 10
     } else {
diff --git a/exercises/02_functions/functions5.rs b/exercises/02_functions/functions5.rs
index 34a2ac7..800703c 100644
--- a/exercises/02_functions/functions5.rs
+++ b/exercises/02_functions/functions5.rs
@@ -1,9 +1,9 @@
 // TODO: Fix the function body without changing the signature.
 fn square(num: i32) -> i32 {
-    num * num;
+    num * num
 }
 
 fn main() {
-    let answer = square(3);
+    let answer: i32 = square(3);
     println!("The square of 3 is {answer}");
 }
diff --git a/exercises/03_if/if1.rs b/exercises/03_if/if1.rs
index e5a3c5a..8036c89 100644
--- a/exercises/03_if/if1.rs
+++ b/exercises/03_if/if1.rs
@@ -4,6 +4,7 @@ fn bigger(a: i32, b: i32) -> i32 {
     // Do not use:
     // - another function call
     // - additional variables
+    if a > b { a } else { b }
 }
 
 fn main() {
diff --git a/exercises/03_if/if2.rs b/exercises/03_if/if2.rs
index ca8493c..8104487 100644
--- a/exercises/03_if/if2.rs
+++ b/exercises/03_if/if2.rs
@@ -2,8 +2,10 @@
 fn picky_eater(food: &str) -> &str {
     if food == "strawberry" {
         "Yummy!"
+    } else if food == "potato" {
+        "I guess I can eat that."
     } else {
-        1
+        "No thanks!"
     }
 }
 
diff --git a/exercises/03_if/if3.rs b/exercises/03_if/if3.rs
index 89164eb..96f81f9 100644
--- a/exercises/03_if/if3.rs
+++ b/exercises/03_if/if3.rs
@@ -3,11 +3,11 @@ fn animal_habitat(animal: &str) -> &str {
     let identifier = if animal == "crab" {
         1
     } else if animal == "gopher" {
-        2.0
+        2
     } else if animal == "snake" {
         3
     } else {
-        "Unknown"
+        0
     };
 
     // Don't change the expression below!
diff --git a/exercises/04_primitive_types/primitive_types1.rs b/exercises/04_primitive_types/primitive_types1.rs
index 84923c7..c464bd9 100644
--- a/exercises/04_primitive_types/primitive_types1.rs
+++ b/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!");
     }
diff --git a/exercises/04_primitive_types/primitive_types2.rs b/exercises/04_primitive_types/primitive_types2.rs
index 1401847..4532608 100644
--- a/exercises/04_primitive_types/primitive_types2.rs
+++ b/exercises/04_primitive_types/primitive_types2.rs
@@ -16,7 +16,7 @@ fn main() {
     // below with your favorite character.
     // 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!");
diff --git a/exercises/04_primitive_types/primitive_types3.rs b/exercises/04_primitive_types/primitive_types3.rs
index 9b79c0c..6ee4a3b 100644
--- a/exercises/04_primitive_types/primitive_types3.rs
+++ b/exercises/04_primitive_types/primitive_types3.rs
@@ -1,6 +1,6 @@
 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!");
diff --git a/exercises/04_primitive_types/primitive_types4.rs b/exercises/04_primitive_types/primitive_types4.rs
index 16e4fd9..a15feb1 100644
--- a/exercises/04_primitive_types/primitive_types4.rs
+++ b/exercises/04_primitive_types/primitive_types4.rs
@@ -9,7 +9,7 @@ mod tests {
         let a = [1, 2, 3, 4, 5];
 
         // 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);
     }
diff --git a/exercises/04_primitive_types/primitive_types5.rs b/exercises/04_primitive_types/primitive_types5.rs
index 6e00ef5..3dce863 100644
--- a/exercises/04_primitive_types/primitive_types5.rs
+++ b/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");
 }
diff --git a/exercises/04_primitive_types/primitive_types6.rs b/exercises/04_primitive_types/primitive_types6.rs
index a97e531..e70cb69 100644
--- a/exercises/04_primitive_types/primitive_types6.rs
+++ b/exercises/04_primitive_types/primitive_types6.rs
@@ -10,7 +10,7 @@ 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!");
     }
diff --git a/exercises/quizzes/quiz1.rs b/exercises/quizzes/quiz1.rs
index 04fb2aa..d3a200d 100644
--- a/exercises/quizzes/quiz1.rs
+++ b/exercises/quizzes/quiz1.rs
@@ -10,7 +10,9 @@
 
 // TODO: Write a function that calculates the price of an order of apples given
 // the quantity bought.
-// fn calculate_price_of_apples(???) -> ??? { ??? }
+fn calculate_price_of_apples(apples: i32) -> i32 {
+    if apples <= 40 { apples * 2 } else { apples }
+}
 
 fn main() {
     // You can optionally experiment here.