Golang: Basic Types

By Xah Lee. Date: . Last updated: .

Basic Types

Go's basic types are

Boolean:

String:

Signed integer types:

Unsigned Integer types:

Type to represent pointer address. [see Golang: Pointer]

Float type. (uses decimal notation, to represent approximation of Real Numbers)

Complex numbers type:

The int, uint, and uintptr types are usually 32 bits wide on 32-bit systems and 64 bits wide on 64-bit systems.

Rune Type

Golang: Rune

Find a Value's Type

fmt.Printf("%T\n", val) → print a value's type.

package main

import "fmt"

func main() {

	var nn = 3
	var ff = 3.123

	// print their types
	fmt.Printf("%T\n", nn) // int
	fmt.Printf("%T\n", ff) // float64
}

Type conversions

type(v) → converts the value v to the type type, where type is the same keyword as the type declaration.

example:

float64(3) → convert value 3 to float64 type.

package main

import (
	"fmt"
	"reflect"
)

func main() {
	var i int = 42
	var f = float64(i)
	fmt.Println(reflect.TypeOf(f)) // float64

}

Number to String

To convert number type to string, use fmt.Sprintf(…)

see Golang: Print

Convert String, Byte Slice, Rune Slice

see Golang: String, Byte Slice, Rune Slice

Reference

The Go Programming Language Specification - The Go Programming Language#Types

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Golang

Examples

Reference