Built-in types

Context

Go is a statically typed language. Every variable has a type known at compile time. Here are the main built‑in types.

Boolean type

• bool – true or false

Numeric types

• Signed integers: int8, int16, int32, int64, int (platform‑dependent: 32 or 64 bits)
• Unsigned integers: uint8, uint16, uint32, uint64, uint, uintptr
• Floating point: float32, float64
• Complex numbers: complex64 (float32+float32), complex128 (float64+float64)
• Byte and rune: byte = uint8 (ASCII/UTF‑8 byte), rune = int32 (Unicode code point)

String type

• string – immutable sequence of bytes (usually UTF‑8)

Example

Declaring variables with explicit types.

Code example

package main

import "fmt"

func main() {
    var flag bool = true
    var age int = 30
    var price float64 = 19.99
    var name string = "Alice"
    var letter byte = 'A'
    var symbol rune = 'é'

    fmt.Println(flag, age, price, name, letter, symbol)
}

Output

true 30 19.99 Alice 65 233

Useful links

• Go language specification: Types
• Go by Example: Values