Add manipulation function to pointer example

src/pointer.go

@@ -1,22 +1,27 @@
 package main
 
-import (  
-    "fmt"
+import (
+	"fmt"
 )
 
-func main() {  
-    b := 255
-    var a *int = &b                       //Saving b's address into variable a
-    fmt.Printf("Type of a is %T\n", a)
+func main() {
+	b := 255
+	var a *int = &b //Saving b's address into variable a
+	fmt.Printf("Type of a is %T\n", a)
 	fmt.Println("address of b is", a)
-
 
-   // Creating pointers using the new function
+	// Creating pointers using the new function
 
-   size := new(int)  // we can imagine that "new" keyword is a pointer
-   fmt.Printf("Size value is %d, type is %T, address is %v\n", *size, size, size)
-   *size = 85 
-   fmt.Println("New size value is", *size)
+	size := new(int) // we can imagine that "new" keyword is a pointer
+	fmt.Printf("Size value is %d, type is %T, address is %v\n", *size, size, size)
+	*size = 85
+	fmt.Println("New size value is", *size)
+	// by using pointers when handing over function parameters you can even manipulate parameters and their origin values
+	manipulatePointerValue(size)
+	fmt.Println("New size value is", *size) // 170
+}
 
-
-}
+// manipulatePointerValue simply just doubles the given input
+func manipulatePointerValue(input *int) {
+	*input = 2 * (*input)
+}