dk: added variables example

variables/constants.go

@@ -0,0 +1,20 @@
+package main
+
+import (
+	"fmt"
+)
+
+func const_var() {
+	// constant variable declaration
+	const str = `Constant variables in Go, where a compile time value is assigned to a variable and 
+	cannot be changed during the execution of the program.`
+	fmt.Println(str)
+
+	const PI float64 = 3.14
+	fmt.Println("Value of PI:", PI)
+
+	// PI = 3.14159
+	// fmt.Println("New Value of PI:", PI)
+	// This will cause a compile-time error
+
+}

variables/main.go

@@ -0,0 +1,8 @@
+package main
+
+func main() {
+	vars()
+	const_var()
+}
+
+// go run *.go

variables/variables.go

@@ -0,0 +1,21 @@
+package main
+
+import "fmt"
+
+// Different ways to declare variables in Go
+
+func vars() {
+	// Method 1: Declare variable with var keyword and specify type
+	var a int = 10
+	// Method 2: Declare variable with var keyword without type (type inferred)
+	var b = 60
+	// Method 3: Declare multiple variables in a single line
+	var c, d int = 20, 30
+	// Method 4: Declare variable without initialization
+	var e int
+	e = 50
+	// Method 5: Type inference | shorthand initialization
+	f := 40
+
+	fmt.Printf("a: %d b: %d c: %d d: %d e: %d f: %d\n", a, b, c, d, e, f)
+}