add: slice exercises

16-slices/exercises/04-declare-arrays-as-slices/main.go

@@ -0,0 +1,44 @@
+// For more tutorials: https://blog.learngoprogramming.com
+//
+// Copyright © 2018 Inanc Gumus
+// Learn Go Programming Course
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+//
+
+package main
+
+import "fmt"
+
+// ---------------------------------------------------------
+// EXERCISE: Declare the arrays as slices
+//
+//   1. First run the following program as it is
+//
+//   2. Then change the array declarations to slice declarations
+//
+//   3. Observe whether anything changes or not (on the surface :)).
+//
+// EXPECTED OUTPUT
+//  names    : []string ["Einstein" "Tesla" "Shepard"]
+//  distances: []int [50 40 75 30 125]
+//  data     : []uint8 [72 69 76 76 79]
+//  ratios   : []float64 %!f(BADINDEX)
+//  alives   : []bool [true false true false]
+//  zero     : []uint8 []
+// ---------------------------------------------------------
+
+func main() {
+	names := [3]string{"Einstein", "Tesla", "Shepard"}
+	distances := [...]int{50, 40, 75, 30, 125}
+	data := [5]byte{'H', 'E', 'L', 'L', 'O'}
+	ratios := [1]float64{3.14145}
+	alives := [...]bool{true, false, true, false}
+	zero := [0]byte{}
+
+	fmt.Printf("names    : %[1]T %[1]q\n", names)
+	fmt.Printf("distances: %[1]T %[1]d\n", distances)
+	fmt.Printf("data     : %[1]T %[1]d\n", data)
+	fmt.Printf("ratios   : %[1]T %[1].2f\n", ratios)
+	fmt.Printf("alives   : %[1]T %[1]t\n", alives)
+	fmt.Printf("zero     : %[1]T %[1]d\n", zero)
+}