add: arrays

14-arrays/exercises/01-declare-empty/solution/main.go

@@ -10,34 +10,38 @@ package main
 import "fmt"
 
 func main() {
-	//  1. Declare and printf the following arrays:
-	//   1. A string array with 4 items
-	//   2. An int array 5 items
-	//   3. A byte array with 5 items
-	//   4. A float64 array with 1 item
-	//   5. A bool array with 4 items
-	//   6. A byte array without any items
 	var (
-		names     [4]string
-		distances [5]int
-		data      [5]byte
-		ratios    [1]float64
-		switches  [4]bool
-		zero      [0]bool
+		names     [3]string  // The names of your best three friends
+		distances [5]int     // The distances to five different locations
+		data      [5]byte    // A data buffer with five bytes of capacity
+		ratios    [1]float64 // Currency exchange ratios only for a single currency
+		alives    [4]bool    // Up/Down status of four different web servers
+		zero      [0]byte    // A byte array that doesn't occupy memory space
 	)
 
+	// 1. Declare and print the arrays with their types.
 	fmt.Printf("names    : %#v\n", names)
 	fmt.Printf("distances: %#v\n", distances)
 	fmt.Printf("data     : %#v\n", data)
 	fmt.Printf("ratios   : %#v\n", ratios)
-	fmt.Printf("switches : %#v\n", switches)
+	fmt.Printf("alives   : %#v\n", alives)
 	fmt.Printf("zero     : %#v\n", zero)
 
-	//  2. Print the types of the previous arrays.
+	//  2. Print only the types of the same arrays.
+	fmt.Println()
 	fmt.Printf("names    : %T\n", names)
 	fmt.Printf("distances: %T\n", distances)
 	fmt.Printf("data     : %T\n", data)
 	fmt.Printf("ratios   : %T\n", ratios)
-	fmt.Printf("switches : %T\n", switches)
+	fmt.Printf("alives   : %T\n", alives)
 	fmt.Printf("zero     : %T\n", zero)
+
+	// 3. Print only the elements of the same arrays.
+	fmt.Println()
+	fmt.Printf("names    : %q\n", names)
+	fmt.Printf("distances: %d\n", distances)
+	fmt.Printf("data     : %d\n", data)
+	fmt.Printf("ratios   : %.2f\n", ratios)
+	fmt.Printf("alives   : %t\n", alives)
+	fmt.Printf("zero     : %d\n", zero)
 }