Printing the Address of a Struct Variable in Go

In Go, the & operator returns the address of a variable, and the * operator dereferences a pointer to access the value it points to. However, when printing the value of a struct using fmt.Println(), the default format is applied, which results in a special syntax for the address of a struct value.

To print the address of a struct variable explicitly, a format string can be used with the %p verb. This verb specifies that the value should be printed as a pointer.

Consider the following example:

type Rect struct {
    width int
    name int
}

func main() {
    r := Rect{4, 6}
    fmt.Printf("%p\n", &r)
}

This code will output the address of the struct variable r as a hexadecimal number. In this case, the output could be similar to:

0x414020

By using the %p verb, you can retrieve and print the address of any variable in Go, including struct variables. This can be useful for debugging purposes or for passing addresses to functions that require them.