Introduction

Variables are fundamental in any programming language, and Go is no exception. In this guide, we'll explore how variables work in Go, along with the various data types available.


Declaring Variables

In Go, you declare a variable using the var keyword. Here's a simple example:

package main
import "fmt"
func main() {
    var age int
    age = 30
    fmt.Println("My age is", age)
}

In this code, we declare a variable named age with the type int and assign it the value 30.


Data Types in Go

Go has various built-in data types, including integers, floating-point numbers, strings, and more. Here are some common data types in Go:

  • int: Signed integers (e.g., int, int8, int16, int32, int64).
  • float64: 64-bit floating-point numbers.
  • string: Textual data.
  • bool: Boolean values (either true or false).

Here's an example of declaring variables with different data types:

package main
import "fmt"
func main() {
    var age int
    var height float64
    var name string
    var isStudent bool
    age = 30
    height = 175.5
    name = "John Doe"
    isStudent = true
    fmt.Println("Name:", name)
    fmt.Println("Age:", age)
    fmt.Println("Height:", height)
    fmt.Println("Is Student:", isStudent)
}

Type Inference

In many cases, Go can infer the type of a variable from the value you assign to it. This is known as type inference. For example:

package main
import "fmt"
func main() {
    name := "Alice"
    age := 25
    isStudent := false
    fmt.Println("Name:", name)
    fmt.Println("Age:", age)
    fmt.Println("Is Student:", isStudent)
}

In this code, we didn't explicitly specify the variable types. Go inferred them from the assigned values.


Constants

Constants are variables whose values cannot be changed once they are set. In Go, you can declare constants using the const keyword. Here's an example:

package main
import "fmt"
const pi = 3.14159
func main() {
    fmt.Println("The value of pi is", pi)
}

Further Resources

To continue learning about Go variables and data types, explore the following resources: