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競プロで使うための GO 入門 ~型変換~

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型変換

Go は、別の型同士の演算・代入・比較が行えないため、型変換を頻繁に利用する。

int <-> float64

package main

import (
    "fmt"
)

func main() {

    var i int = 5
    var f float64 = 5.9
    
    // float64をintへキャスト(小数点切り捨て)
    fmt.Println(i + int(f)) // ->10

    //intをfloat64へキャスト
    fmt.Println(float64(i) + f) // ->10.9
}

数値 <-> 文字

"strconv"パッケージを使用する

package main

import (
    "fmt"
    "strconv" // strconv
)

func main() {

    var s_1 string = "12"
    var s_2 string = "34"
    var i_1 int
    var i_2 int

    i_1, _ = strconv.Atoi(s_1)
    i_2, _ = strconv.Atoi(s_2)
    
    fmt.Println(i_1 + i_2) // ->46
    
    s_1 = strconv.Itoa(i_2)
    s_2 = strconv.Itoa(i_1)
    
    fmt.Println(s_1 + s_2) // ->3412
}

文字列 <-> 論理型

package main

import (
    "fmt"
    "strconv" // strconv
)

func main() {

    var s string = "true"
    var b bool
    b, _ = strconv.ParseBool(s)
    fmt.Println(b) // ->true

    s= strconv.FormatBool(b)
    fmt.Println(s) // ->"false"
}
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