day one

I_have_done/intro/README.md

@@ -0,0 +1,8 @@
+# Intro
+
+Rust uses the `print!` and `println!` macros to print text to the console.
+
+## Further information
+
+- [Hello World](https://doc.rust-lang.org/rust-by-example/hello.html)
+- [Formatted print](https://doc.rust-lang.org/rust-by-example/hello/print.html)

I_have_done/intro/intro1.rs

@@ -0,0 +1,21 @@
+// intro1.rs
+// About this `I AM NOT DONE` thing:
+// We sometimes encourage you to keep trying things on a given exercise, even
+// after you already figured it out. If you got everything working and feel
+// ready for the next exercise, remove the `I AM NOT DONE` comment below.
+// Execute the command `rustlings hint intro1` for a hint.
+
+fn main() {
+    println!("Hello and");
+    println!(r#"       welcome to...                      "#);
+    println!(r#"                 _   _ _                  "#);
+    println!(r#"  _ __ _   _ ___| |_| (_)_ __   __ _ ___  "#);
+    println!(r#" | '__| | | / __| __| | | '_ \ / _` / __| "#);
+    println!(r#" | |  | |_| \__ \ |_| | | | | | (_| \__ \ "#);
+    println!(r#" |_|   \__,_|___/\__|_|_|_| |_|\__, |___/ "#);
+    println!(r#"                               |___/      "#);
+    println!();
+    println!("This exercise compiles successfully. The remaining exercises contain a compiler");
+    println!("or logic error. The central concept behind Rustlings is to fix these errors and");
+    println!("solve the exercises. Good luck!");
+}

I_have_done/intro/intro2.rs

@@ -0,0 +1,7 @@
+// intro2.rs
+// Make the code print a greeting to the world.
+// Execute `rustlings hint intro2` for a hint.
+
+fn main() {
+    println!("Hello!");
+}

I_have_done/intro/mod.rs

@@ -0,0 +1,2 @@
+mod intro1;
+mod intro2;

I_have_done/variables/README.md

@@ -0,0 +1,9 @@
+# Variables
+
+In Rust, variables are immutable by default.
+When a variable is immutable, once a value is bound to a name, you can’t change that value.
+You can make them mutable by adding mut in front of the variable name.
+
+## Further information
+
+- [Variables and Mutability](https://doc.rust-lang.org/book/ch03-01-variables-and-mutability.html)

I_have_done/variables/mod.rs

@@ -0,0 +1,6 @@
+mod variables1;
+mod variables2;
+mod variables3;
+mod variables4;
+mod variables5;
+mod variables6;

I_have_done/variables/variables1.rs

@@ -0,0 +1,9 @@
+// variables1.rs
+// Make me compile!
+// Execute the command `rustlings hint variables1` if you want a hint :)
+
+
+fn main() {
+    let x = 5;
+    println!("x has the value {}", x);
+}

I_have_done/variables/variables2.rs

@@ -0,0 +1,12 @@
+// variables2.rs
+// Make me compile! Execute the command `rustlings hint variables2` if you want a hint :)
+
+
+fn main() {
+    let x = 10;
+    if x == 10 {
+        println!("Ten!");
+    } else {
+        println!("Not ten!");
+    }
+}

I_have_done/variables/variables3.rs

@@ -0,0 +1,10 @@
+// variables3.rs
+// Make me compile! Execute the command `rustlings hint variables3` if you want a hint :)
+
+
+fn main() {
+    let mut x = 3;
+    println!("Number {}", x);
+    x = 5; // don't change this line
+    println!("Number {}", x);
+}

I_have_done/variables/variables4.rs

@@ -0,0 +1,8 @@
+// variables4.rs
+// Make me compile! Execute the command `rustlings hint variables4` if you want a hint :)
+
+
+fn main() {
+    let x: i32 = 100;
+    println!("Number {}", x);
+}

I_have_done/variables/variables5.rs

@@ -0,0 +1,10 @@
+// variables5.rs
+// Make me compile! Execute the command `rustlings hint variables5` if you want a hint :)
+
+
+fn main() {
+    let number = "T-H-R-E-E"; // don't change this line
+    println!("Spell a Number : {}", number);
+    let mut number = 3;
+    println!("Number plus two is : {}", number + 2);
+}

I_have_done/variables/variables6.rs

@@ -0,0 +1,9 @@
+// variables6.rs
+// Make me compile! Execute the command `rustlings hint variables6` if you want a hint :)
+
+
+const NUMBER : i32 = 3;
+
+fn main() {
+    println!("Number {}", NUMBER);
+}

exercises/variables/variables1.rs

@@ -2,9 +2,8 @@
 // Make me compile!
 // Execute the command `rustlings hint variables1` if you want a hint :)
 
-// I AM NOT DONE
 
 fn main() {
-    x = 5;
+    let x = 5;
     println!("x has the value {}", x);
 }

exercises/variables/variables2.rs

@@ -1,10 +1,9 @@
 // variables2.rs
 // Make me compile! Execute the command `rustlings hint variables2` if you want a hint :)
 
-// I AM NOT DONE
 
 fn main() {
-    let x;
+    let x = 10;
     if x == 10 {
         println!("Ten!");
     } else {

exercises/variables/variables3.rs

@@ -1,10 +1,9 @@
 // variables3.rs
 // Make me compile! Execute the command `rustlings hint variables3` if you want a hint :)
 
-// I AM NOT DONE
 
 fn main() {
-    let x = 3;
+    let mut x = 3;
     println!("Number {}", x);
     x = 5; // don't change this line
     println!("Number {}", x);

exercises/variables/variables4.rs

@@ -1,9 +1,8 @@
 // variables4.rs
 // Make me compile! Execute the command `rustlings hint variables4` if you want a hint :)
 
-// I AM NOT DONE
 
 fn main() {
-    let x: i32;
+    let x: i32 = 100;
     println!("Number {}", x);
 }

exercises/variables/variables5.rs

@@ -1,11 +1,10 @@
 // variables5.rs
 // Make me compile! Execute the command `rustlings hint variables5` if you want a hint :)
 
-// I AM NOT DONE
 
 fn main() {
     let number = "T-H-R-E-E"; // don't change this line
     println!("Spell a Number : {}", number);
-    number = 3;
+    let mut number = 3;
     println!("Number plus two is : {}", number + 2);
 }

exercises/variables/variables6.rs

@@ -1,9 +1,9 @@
 // variables6.rs
 // Make me compile! Execute the command `rustlings hint variables6` if you want a hint :)
 
-// I AM NOT DONE
 
-const NUMBER = 3;
+const NUMBER : i32 = 3;
+
 fn main() {
     println!("Number {}", NUMBER);
 }