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Variables

Syntax

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)
}

Variables with Initializers

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!

Short Variable Declarations

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!

Zero Values

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