カテゴリー: Go言語

package main

import (
    "fmt"
    "time"
)

func double(num int, ch chan int) {
    time.Sleep(time.Second * 1)
    ch <- num * 2
}

func main() {
    // var ch chan int = make(chan int)
    ch := make(chan int)
    fmt.Println("Start!")

    go double(10, ch)

    time.Sleep(time.Second * 3)
    fmt.Println("Finish!")
}

package main

import "fmt"

type englishScoreType int
type mathScoreType int

func (e englishScoreType) isPassed() bool {
    return e >= 80
}

func (m mathScoreType) isPassed() bool {
    return m >= 70
}

type passChecker interface {
    isPassed() bool
}

func showResult(score passChecker) {
    if score.isPassed() {
        fmt.Println("Pass!")
    } else {
        fmt.Println("Fail...")
    }
}

func main() {
    englishScore := englishScoreType(90)
    mathScore := mathScoreType(50)

    showResult(englishScore)
    showResult(mathScore)
}

package main

import "fmt"

type studentType struct {
    name string
    score scoreType
}

type scoreType struct {
    subject string
    points int
}

func (s scoreType) isPassed() bool {
    if s.points >= 70 {
        return true
    } else {
        return false
    }
}

func main() {
    taro := studentType{
        name:  "Taro",
        score: scoreType{
            subject: "Math",
            points:  85,
        },
    }

    fmt.Println(taro.name)
    fmt.Println(taro.score.subject)
    fmt.Println(taro.score.points)
    fmt.Println(taro.score.isPassed())
}

package main

import "fmt"

type nameString string

func (n nameString)showInfo() {
    fmt.Println(n)
}

func main() {
    var productName nameString = "Banana"

    productName.showInfo()
}

package main

import "fmt"

type student struct {
    name string
    subject string
    score int
}

func addScore(pStudent *student) {
    pStudent.score++
}

func main() {
    taro := student{
        name: "Taro",
        subject: "Math",
        score: 40,
    }
    addScore(&taro)

    fmt.Println(taro.score)
}

package main

import "fmt"

// func showIntThreeTimes(num int) {
//     fmt.Println(num)
//     fmt.Println(num)
//     fmt.Println(num)
// }

// func showFloat64ThreeTimes(num float64) {
//     fmt.Println(num)
//     fmt.Println(num)
//     fmt.Println(num)
// }

func showThreeTimes[T any](num T) {
    fmt.Println(num)
    fmt.Println(num)
    fmt.Println(num)
}

func main() {
    // showIntThreeTimes(3)
    // showFloat64ThreeTimes(5.2)
    showThreeTimes(3)
    showThreeTimes(5.2)
}

package main

import "fmt"

// func triple(num int) int {
//     return num * 3
// }

func main() {
    // f := triple
    f := func(num int) int {
        return num * 3
    }

    fmt.Println(f(5))
}

package main

import "fmt"

func isPasswordValid(password string) bool {
    if len(password) < 8 {
        return false
    } else {
        return true
    }
}

func main() {
    fmt.Println(isPasswordValid("abc")) // false
    fmt.Println(isPasswordValid("helloworld")) // true
}

package main

import "fmt"

func divide(a, b int) (int, int) {
    return a / b, a % b
}

func main() {
    quotient, remainder := divide(10, 3)
    fmt.Println(quotient)
    fmt.Println(remainder)
}

package main

import "fmt"

func main() {
    var score int
    fmt.Println("Score?")
    fmt.Scanf("%d", &score)

    if score >= 90 {
        fmt.Println("A!")
    } else if score >= 70 {
        fmt.Println("B!")
    } else {
        fmt.Println("C!")
    }

    switch{
    case score >= 90:
        fmt.Println("A!")
    case score >= 70:
        fmt.Println("B!")
    default:
        fmt.Println("C!")
    }
}