var keyword in Go
Last Updated :
20 Nov, 2019
var keyword in Golang is used to create the variables of a particular type having a proper name and initial value. Initialization is optional at the time of declaration of variables using var keyword that we will discuss later in this article.
Syntax:
var identifier type = expression
Example:
// here geek1 is the identifier
// or variable name, int is the
// type and 200 is assigned value
var geek1 int = 200
As you know that Go is a statically typed language but it still provides a facility to remove the declaration of data type while declaring a variable as shown in below syntax. This is generally termed as the Type Inference.
Syntax:
var identifier = initialValue
Example:
var geek1 = 200
Multiple variable declarations using var Keyword
var keyword is also used to declare multiple variables in a single line. You can also provide the initial value to the variables as shown below:
- Declaring multiple variables using var keyword along with the type:
var geek1, geek2, geek3, geek4 int
- Declaring multiple variables using var keyword along with the type and initial values:
var geek1, geek2, geek3, geek4 int = 10, 20, 30, 40
Note:
- You can also use type inference(discussed above) that will let the compiler to know about the type i.e. there is an option to remove the type while declaring multiple variables.
Example:
var geek1, geek2, geek3, geek4 = 10, 20, 30.30, true
- You can also use multiple lines to declare and initialize the values of different types using a var keyword as follows:
Example:
var(
geek1 = 100
geek2 = 200.57
geek3 bool
geek4 string = "GeeksforGeeks"
)
- While using type during declaration you are only allowed to declare multiple variables of the same type. But removing type during declarations you are allowed to declare multiple variables of different types.
Example:
package main
import "fmt"
func main() {
var geek1, geek2, geek3 int = 232, 784, 854
var geek4, geek5, geek6 = 100, "GFG" , 7896.46
fmt.Printf( "The value of geek1 is : %d\n" , geek1)
fmt.Printf( "The value of geek2 is : %d\n" , geek2)
fmt.Printf( "The value of geek3 is : %d\n" , geek3)
fmt.Printf( "The value of geek4 is : %d\n" , geek4)
fmt.Printf( "The value of geek5 is : %s\n" , geek5)
fmt.Printf( "The value of geek6 is : %f" , geek6)
}
|
Output:
The value of geek1 is : 232
The value of geek2 is : 784
The value of geek3 is : 854
The value of geek4 is : 100
The value of geek5 is : GFG
The value of geek6 is : 7896.460000
Important Points about var keyword:
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