add own edits to compile all 6 exercises

exercises/variables/variables1.rs

@@ -6,9 +6,8 @@
 // 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.
 
-// I AM NOT DONE
 
 fn main() {
-    x = 5;
+    let x = 5;
     println!("x has the value {}", x);
 }

exercises/variables/variables2.rs

@@ -1,13 +1,12 @@
 // 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 = 7;
     if x == 10 {
         println!("Ten!");
     } else {
-        println!("Not ten!");
+        println!("Not ten, but {}", x);
     }
 }

exercises/variables/variables3.rs

@@ -1,11 +1,12 @@
 // 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);
+    println!("Then changed to ");
     x = 5; // don't change this line
     println!("Number {}", x);
+    println!("Because of the keyword mut");
 }

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 = 90;
     println!("Number {}", x);
 }

exercises/variables/variables5.rs

@@ -1,11 +1,11 @@
 // 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";
+    let mut number = "T-H-R-E-E";
-    println!("Spell a Number : {}", number);
+    println!("Spell a Number (string): {}", number);
-    number = 3;
+    let number = 3;
+    println!("new number (type int) is : {}", number);
     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;
+const NUMBER: i64 = 300;
 fn main() {
     println!("Number {}", NUMBER);
 }