Go 使い方メモ 1

package main

import (
    "strconv"
    "fmt"
)

type struct_test struct {
    X int
    Y int
}

func add(x int,y int) int {
    return x + y
}

func add_minus(x, y int)(string,string) {
    addval := x + y
    minusval := x - y
    return strconv.Itoa(addval),strconv.Itoa(minusval)
}

func isminus(x int) bool {
    retbool := false
    if x < 0 {
        retbool = true
    }
    return retbool
}


func add_for(x,loop int)(result int) {
    var sum = 0
    for i := 0; i < loop;i++ {
        sum = sum + x
    }
    return sum
}

func to_byte(targetstr string) []byte {
    return []byte(targetstr)
}

func main() {
    retadd := add(1,3)
    fmt.Println(retadd)
    fmt.Println(" ")

    retplus,retminus := add_minus(10,5)
    fmt.Println(retplus)
    fmt.Println(retminus)
    fmt.Println(" ")

    strct1 := struct_test{3,4}
    strct1.X = 5
    fmt.Println(strct1.X , strct1.Y)
    strct1.Y += 3
    fmt.Println(strct1.X , strct1.Y)
    p := &strct1
    p.X = 30
    fmt.Println(strct1.X , strct1.Y)
    fmt.Println(" ")

    var retfor = add_for(2,10)
    fmt.Println(retfor)
    fmt.Println(" ")
    
    var retbs []byte = to_byte("テスト")
    fmt.Println(string(retbs))
    fmt.Println(len(retbs))
    fmt.Println(" ")

    retbl := isminus(-10)
    fmt.Println(retbl)
    fmt.Println(" ")

}