Array Examples

Author: Rajeev Kumar Singh

tutorial6-arrays/array.go

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+package main
+
+import "fmt"
+
+func main() {
+	var x [5]int // An array of 5 integers
+	fmt.Println(x)
+
+	var y [8]string // An array of 8 strings
+	fmt.Println(y)
+
+	var z [3]complex128 // An array of 3 complex numbers
+	fmt.Println(z)
+
+	// By default, all the array elements are assigned the zero value of the array type.
+	// For example, if we declare an integer array, all the elements will be initialized with zero.
+	// If we declare a string array, all the elements will be initialized with an empty string, and so on.
+}

tutorial6-arrays/array_indexing.go

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+package main
+
+import "fmt"
+
+func main() {
+	var x [5]int // An array of 5 integers
+
+	x[0] = 100
+	x[1] = 101
+	x[3] = 103
+	x[4] = 105
+
+	fmt.Printf("x[0] = %d, x[1] = %d, x[2] = %d\n", x[0], x[1], x[2])
+	fmt.Println("x = ", x)
+}

tutorial6-arrays/array_initialization_short_hand_declaration.go

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+package main
+
+import "fmt"
+
+func main() {
+	// Declaring and initializing an array at the same time
+	var a = [5]int{2, 4, 6, 8, 10}
+	fmt.Println(a)
+
+	// Short hand declaration for declaring and initializing an array
+	b := [5]int{2, 4, 6, 8, 10}
+	fmt.Println(b)
+
+	// You don't need to initialize all the elements of the array.
+	// The un-initialized elements will be assigned the zero value of the corresponding array type
+	c := [5]int{2}
+	fmt.Println(c)
+
+	// Letting Go compiler infer the length of the array
+	d := [...]int{3, 5, 7, 9, 11, 13, 17}
+	fmt.Println(d)
+}

tutorial6-arrays/array_iteration.go

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+package main
+
+import "fmt"
+
+func main() {
+	// Iterating over and Array and printing its elements
+	names := [3]string{"Mark Zuckerberg", "Bill Gates", "Larrt Page"}
+
+	for i := 0; i < len(names); i++ {
+		fmt.Println(names[i])
+	}
+
+	// Finding the Sum of an Array
+	a := [4]float64{3.5, 7.2, 4.8, 9.5}
+	sum := float64(0)
+
+	for i := 0; i < len(a); i++ {
+		sum = sum + a[i]
+	}
+
+	fmt.Printf("Sum of all the elements in array  %v = %f\n", a, sum)
+}

tutorial6-arrays/array_iteration_range.go

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+package main
+
+import "fmt"
+
+func main() {
+	// Iterating over an array using range form of for loop
+	daysOfWeek := [7]string{"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"}
+
+	for index, value := range daysOfWeek {
+		fmt.Printf("Day %d of week = %s\n", index, value)
+	}
+
+	// Finding the sum of an array
+	a := [4]float64{3.5, 7.2, 4.8, 9.5}
+	sum := float64(0)
+
+	for _, value := range a {
+		sum = sum + value
+	}
+
+	fmt.Printf("Sum of all the elements in array %v = %f\n", a, sum)
+}

tutorial6-arrays/array_value_types.go

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+package main
+
+import "fmt"
+
+func main() {
+	a1 := [5]string{"English", "Japanese", "Spanish", "French", "Hindi"}
+	a2 := a1 // A copy of the array `a1` is assigned to `a2`
+
+	a2[1] = "German"
+
+	fmt.Println("a1 = ", a1) // The array `a1` remains unchanged
+	fmt.Println("a2 = ", a2)
+}

tutorial6-arrays/multi_dimensional_array.go

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+package main
+
+import "fmt"
+
+func main() {
+	a := [2][2]int{
+		{3, 5},
+		{7, 9}, // This comma is necessary
+	}
+	fmt.Println(a)
+
+	// Just like 1D arrays, you don't need to initialize all the elements in a multi-dimensional array.
+	// Un-initialized array elements will be assigned the zero value of the array type
+	b := [3][4]float64{
+		{1, 3},
+		{4.5, -3, 7.4, 2},
+		{6, 2, 11},
+	}
+	fmt.Println(b)
+}