Values and Variables

Values

package main

import "fmt"

func main() {
    fmt.Println("go" + "lang") //문자열은 +로 더할 수 있
    
    fmt.Println("1+1 =", 1+1)
    fmt.Println("7.0/3.0 =", 7.0/3.0)
    
    fmt.Println(true && false) //불리언도 당연히 가능하
    fmt.Println(true || false)
    fmt.Println(!true)
}

• Go has various value types. Here are a few basic examples.

Variables

package main

import "fmt"

func main() {
    
    var a = "initial"
    
    var b, c int = 1, 2

    var d = true
    
    var e int // is 0
    fmt.Println(e)
    
    var g string // is ""
    
    fmt.Println(g == "") // true
    
    f := "apple" // 선언과 초기화를 동시
    fmt.Println(f)
}

• var declares 1 or more variables.

• You can declare multiple variables at once - var b, c int 1, 2

• Variables declared without initialization are zero-valued.

  • int is 0, string is ""

• The := syntax is shorthand for declaring and initializing a variable