Variables and constants

Context

Go provides several ways to declare variables and constants.

Variable declarations

1. var with type – var name string
2. var with initializer – var name = "Alice" (type inferred)
3. Short assignment := – name := "Alice" (inside functions only)
4. Multiple variables – var x, y int = 1, 2 or x, y := 1, 2

Constants

• Declared with const keyword.
• Cannot be changed after declaration.
• Can be untyped (e.g., const Pi = 3.14).

Example

Demonstrate different variable declarations and constants.

Code example

package main

import "fmt"

const Pi = 3.14159
const (
    StatusOK = 200
    StatusNotFound = 404
)

func main() {
    var name string = "Alice"
    var age = 30
    city := "Paris"
    var x, y int = 10, 20
    a, b := "hello", true

    fmt.Println(name, age, city)
    fmt.Println(x, y, a, b)
    fmt.Println(Pi, StatusOK, StatusNotFound)
}

Output

Alice 30 Paris
10 20 hello true
3.14159 200 404

Useful links

• Go specification: Variables
• Go by Example: Variables
• Go by Example: Constants