First commit

exercises/02_functions/README.md

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+# Functions
+
+Here, you'll learn how to write functions and how the Rust compiler can help you debug errors even
+in more complex code.
+
+## Further information
+
+- [How Functions Work](https://doc.rust-lang.org/book/ch03-03-how-functions-work.html)

exercises/02_functions/functions1.rs

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+// TODO: Add some function with the name `call_me` without arguments or a return value.
+
+fn main() {
+    call_me(); // Don't change this line
+}
+
+fn call_me(){
+    
+}

exercises/02_functions/functions2.rs

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+// TODO: Add the missing type of the argument `num` after the colon `:`.
+fn call_me(num: i32) {
+    for i in 0..num {
+        println!("Ring! Call number {}", i + 1);
+    }
+}
+
+fn main() {
+    call_me(3);
+}

exercises/02_functions/functions3.rs

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+fn call_me(num: u8) {
+    for i in 0..num {
+        println!("Ring! Call number {}", i + 1);
+    }
+}
+
+fn main() {
+    // TODO: Fix the function call.
+    call_me(6);
+}

exercises/02_functions/functions4.rs

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+// This store is having a sale where if the price is an even number, you get 10
+// Rustbucks off, but if it's an odd number, it's 3 Rustbucks off.
+// Don't worry about the function bodies themselves, we are only interested in
+// the signatures for now.
+
+fn is_even(num: i64) -> bool {
+    num % 2 == 0
+}
+
+// TODO: Fix the function signature.
+fn sale_price(price: i64) -> i64{
+    if is_even(price) {
+        price - 10
+    } else {
+        price - 3
+    }
+}
+
+fn main() {
+    let original_price = 51;
+    println!("Your sale price is {}", sale_price(original_price));
+}

exercises/02_functions/functions5.rs

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+// TODO: Fix the function body without changing the signature.
+fn square(num: i32) -> i32 {
+   return num * num;
+}
+
+fn main() {
+    let answer = square(3);
+    println!("The square of 3 is {answer}");
+}