Zero values

Variables declared without an explicit initial value are given their zero value.

The zero value is:

• 0 for numeric types,
• false for the boolean type, and
• "" (the empty string) for strings.

zero.go

package main
import "fmt"
func main() {
    var i int
    var f float64
    var b bool
    var s string
    fmt.Printf("%v %v %v %q\n", i, f, b, s)
}