add solutions to exercise primitives_types

exercises/primitive_types/primitive_types1.rs

@@ -2,7 +2,7 @@
 // Fill in the rest of the line that has code missing!
 // No hints, there's no tricks, just get used to typing these :)
 
-// I AM NOT DONE
+// may 25/21 DONE
 
 fn main() {
     // Booleans (`bool`)
@@ -12,7 +12,7 @@ fn main() {
         println!("Good morning!");
     }
 
-    let // Finish the rest of this line like the example! Or make it be false!
+    let is_evening = false;
     if is_evening {
         println!("Good evening!");
     }

exercises/primitive_types/primitive_types2.rs

@@ -2,7 +2,7 @@
 // Fill in the rest of the line that has code missing!
 // No hints, there's no tricks, just get used to typing these :)
 
-// I AM NOT DONE
+// done may 25/21
 
 fn main() {
     // Characters (`char`)
@@ -16,7 +16,8 @@ fn main() {
         println!("Neither alphabetic nor numeric!");
     }
 
-    let // Finish this line like the example! What's your favorite character?
+    //let // Finish this line like the example! What's your favorite character?
+    let your_character = '&';
     // Try a letter, try a number, try a special character, try a character
     // from a different language than your own, try an emoji!
     if your_character.is_alphabetic() {

exercises/primitive_types/primitive_types3.rs

@@ -2,14 +2,27 @@
 // Create an array with at least 100 elements in it where the ??? is.
 // Execute `rustlings hint primitive_types3` for hints!
 
-// I AM NOT DONE
+// may 25/21 DONE
 
 fn main() {
-    let a = ???
+    // create array of type i32 having 120 elements
+    let a: [i32; 120] = [0; 120];
 
     if a.len() >= 100 {
         println!("Wow, that's a big array!");
+        //println!("the number of elements in array: {}", a.len());
+		//make function to borrow whole array as slice
+		analyze_slice(&a);
+		//slice can point to a section of array
+		println!("borrow a section of the array as a slice");
+		analyze_slice(&a[0 .. 10]);
     } else {
         println!("Meh, I eat arrays like that for breakfast.");
     }
 }
+// this function borrows a slice
+fn analyze_slice(slice: &[i32]) {
+	println!("slice first element: {}", slice[0]);
+	println!("borrowed slice has {} elements", slice.len());
+
+}

exercises/primitive_types/primitive_types4.rs

@@ -2,13 +2,14 @@
 // Get a slice out of Array a where the ??? is so that the test passes.
 // Execute `rustlings hint primitive_types4` for hints!!
 
-// I AM NOT DONE
+// May 25/21 DONE
 
 #[test]
 fn slice_out_of_array() {
     let a = [1, 2, 3, 4, 5];
 
-    let nice_slice = ???
+    let nice_slice = &a[1 .. 4];
+	//println!("value is {:#?}", nice_slice);
 
     assert_eq!([2, 3, 4], nice_slice)
 }

exercises/primitive_types/primitive_types5.rs

@@ -2,11 +2,12 @@
 // Destructure the `cat` tuple so that the println will work.
 // Execute `rustlings hint primitive_types5` for hints!
 
-// I AM NOT DONE
+// may 25/21 DONE
 
 fn main() {
     let cat = ("Furry McFurson", 3.5);
-    let /* your pattern here */ = cat;
+    //let /* your pattern here */ = cat;
+    let (name, age) = cat;
 
     println!("{} is {} years old.", name, age);
 }

exercises/primitive_types/primitive_types6.rs

@@ -3,13 +3,13 @@
 // You can put the expression for the second element where ??? is so that the test passes.
 // Execute `rustlings hint primitive_types6` for hints!
 
-// I AM NOT DONE
+// may 25/21 DONE
 
 #[test]
 fn indexing_tuple() {
     let numbers = (1, 2, 3);
     // Replace below ??? with the tuple indexing syntax.
-    let second = ???;
+    let second = numbers.1;
 
     assert_eq!(2, second,
         "This is not the 2nd number in the tuple!")