Comment on page
Variables
var <name> <type>
var <name> <type> = <expression>
package main
import "fmt"
func main(){
var hello_str string
hello_str="Hello, World!"
fmt.Println(hello_str)
}
The type can be omitted if there is an initializer. The variables takes the type of the initializer.
package main
import "fmt"
var i, j int = 1, 2
func main() {
var c, python, java = true, false, "no!"
fmt.Println(i, j, c, python, java)
}
1 2 true false no!
Inside a function, the
:= short assignment statement can be used in place of a var declaration with implicit type.Outside a function, every statement begins with a keyword (
var, func, and so on) and so the := construct is not available.package main
import "fmt"
func main() {
var i, j int = 1, 2
k := 3
c, python, java := true, false, "no!"
fmt.Println(i, j, k, c, python, java)
}
1 2 3 true false no!
TYPES | ZERO VALUES |
Numeric types | 0 |
Boolean type | false |
Strings | "" (empty string) |
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)
}
0 0 false ""
Last modified 2yr ago