first go at the exercises

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!");
 }

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}");
 }

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!");

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 = 5;
 
     println!("Number {x}");
 }

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

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);
 }

exercises/01_variables/variables6.rs

@@ -1,5 +1,5 @@
 // TODO: Change the line below to fix the compiler error.
-const NUMBER = 3;
+const NUMBER: u32 = 3;
 
 fn main() {
     println!("Number: {NUMBER}");

exercises/02_functions/functions1.rs

@@ -1,5 +1,10 @@
 // TODO: Add some function with the name `call_me` without arguments or a return value.
 
+fn call_me()
+{
+    println!("hoi");
+}
+
 fn main() {
     call_me(); // Don't change this line
 }

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: u32) {
     for i in 0..num {
         println!("Ring! Call number {}", i + 1);
     }

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(255);
 }

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 {

exercises/02_functions/functions5.rs

@@ -1,6 +1,6 @@
 // TODO: Fix the function body without changing the signature.
 fn square(num: i32) -> i32 {
-    num * num;
+    num * num
 }
 
 fn main() {

exercises/03_if/if1.rs

@@ -4,6 +4,12 @@ fn bigger(a: i32, b: i32) -> i32 {
     // Do not use:
     // - another function call
     // - additional variables
+    if a < b {
+        b
+    }
+    else {
+        a
+    }
 }
 
 fn main() {

exercises/03_if/if2.rs

@@ -2,8 +2,12 @@
 fn foo_if_fizz(fizzish: &str) -> &str {
     if fizzish == "fizz" {
         "foo"
-    } else {
-        1
+    } 
+    else if fizzish == "fuzz" {
+        "bar"
+    }
+    else {
+        "baz"
     }
 }
 

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"
+        4
     };
 
     // Don't change the expression below!

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

@@ -17,6 +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 = 'e';
 
     if your_character.is_alphabetic() {
         println!("Alphabetical!");

exercises/04_primitive_types/primitive_types3.rs

@@ -1,6 +1,7 @@
 fn main() {
     // TODO: Create an array called `a` with at least 100 elements in it.
     // let a = ???
+    let a = (1..150).collect::<std::vec::Vec<u8>>();
 
     if a.len() >= 100 {
         println!("Wow, that's a big array!");

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 +3,8 @@ fn main() {
 
     // TODO: Destructure the `cat` tuple in one statement so that the println works.
     // let /* your pattern here */ = cat;
+    let name = cat.0;
+    let age = cat.1;
 
     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/quizzes/quiz1.rs

@@ -11,6 +11,13 @@
 // 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: u16) -> u16 {
+    if apples <= 40 {
+        apples * 2
+    } else {
+        apples
+    }
+}
 
 fn main() {
     // You can optionally experiment here.