Go Variables

Back to: Golang

A variable is a named memory location that stores a value of a specific data type. Variables are used to hold data that may change during the execution of a program. Let’s see how we use variables in Golang:

Golang uses a static type system, which means that each variable must be declared with a specific type before it can be used. To declare a variable in Golang, use the following syntax:

var variable_name data_type

For example, to declare a variable called “age” of type “int”, you would write:

var age int

You can also initialize a variable at the time of declaration by assigning a value to it:

var name string = "John"

In some cases, Golang can infer the type of a variable based on the assigned value, in which case you can omit the type declaration:

age := 42

Once a variable is declared, you can assign new values to it as needed:

age = 43

You can also declare and assign multiple variables at once using the following syntax:

var x, y, z int = 1, 2, 3

Code example of how to declare and use variables in Golang:

package main

import "fmt"

func main() {
    // Declare a variable called "age" of type "int"
    var age int

    // Assign a value of 42 to the "age" variable
    age = 42

    // Declare and initialize a variable called "name" of type "string"
    var name string = "John"

    // Declare and initialize multiple variables at once
    var x, y, z int = 1, 2, 3

    // Golang can infer the type of a variable based on the assigned value
    greeting := "Hello, world!"

    // Print the values of the variables
    fmt.Println("Age:", age)
    fmt.Println("Name:", name)
    fmt.Println("x:", x, "y:", y, "z:", z)
    fmt.Println(greeting)
}

In this example, we declare a variable called “age” of type “int” and assign a value of 42 to it. We also declare and initialize a variable called “name” of type “string” and multiple variables at once. Additionally, we use Golang’s type inference to declare a variable called “greeting” and assign it a value of “Hello, world!”.

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