go - 将整数转换为浮点数

Question

如何将整数值转换为float64类型？

我试过了

float(integer_value)

但这不起作用。并且在Golang.org上找不到任何可以执行此操作的包

如何float64从整数值中获取值？

Answer 1

没有float类型。看起来像你想要float64的。float32如果您只需要一个单精度浮点值，您也可以使用。

package main

import "fmt"

func main() {
    i := 5
    f := float64(i)
    fmt.Printf("f is %f\n", f)
}

Answer 2

只是为了完整起见，这里是描述所有类型的 golang 文档的链接。在您的情况下，它是数字类型：

uint8       the set of all unsigned  8-bit integers (0 to 255)
uint16      the set of all unsigned 16-bit integers (0 to 65535)
uint32      the set of all unsigned 32-bit integers (0 to 4294967295)
uint64      the set of all unsigned 64-bit integers (0 to 18446744073709551615)

int8        the set of all signed  8-bit integers (-128 to 127)
int16       the set of all signed 16-bit integers (-32768 to 32767)
int32       the set of all signed 32-bit integers (-2147483648 to 2147483647)
int64       the set of all signed 64-bit integers (-9223372036854775808 to 9223372036854775807)

float32     the set of all IEEE-754 32-bit floating-point numbers
float64     the set of all IEEE-754 64-bit floating-point numbers

complex64   the set of all complex numbers with float32 real and imaginary parts
complex128  the set of all complex numbers with float64 real and imaginary parts

byte        alias for uint8
rune        alias for int32

这意味着您需要使用float64(integer_value).

Answer 3

intutils.ToFloat32

// ToFloat32 converts a int num to a float32 num
func ToFloat32(in int) float32 {
    return float32(in)
}

// ToFloat64 converts a int num to a float64 num
func ToFloat64(in int) float64 {
    return float64(in)
}

Answer 4

正确放置括号是关键：

package main

import (
    "fmt"
)

func main() {

    var payload uint32
    var fpayload float32
    payload = 1320
    
    // works
    fpayload = float32(payload) / 100.0
    fmt.Printf("%T = %d, %T = %f\n", payload, payload, fpayload, fpayload)
    
    // doesn't work
    fpayload = float32(payload / 100.0)
    fmt.Printf("%T = %d, %T = %f\n", payload, payload, fpayload, fpayload)
}

结果：

uint32 = 1320，float32 = 13.200000

uint32 = 1320，float32 = 13.000000

围棋游乐场

Answer 5

类型转换T()其中T是结果的所需数据类型，在 GoLang 中非常简单。

在我的程序中，我从用户输入中扫描一个整数i，对其执行类型转换并将其存储在变量f中。输出打印输入的float64等价物int。float32数据类型在 GoLang 中也可用

代码：

package main
import "fmt"
func main() {
    var i int
    fmt.Println("Enter an Integer input: ")
    fmt.Scanf("%d", &i)
    f := float64(i)
    fmt.Printf("The float64 representation of %d is %f\n", i, f)
}

解决方案：

>>> Enter an Integer input:
>>> 232332
>>> The float64 representation of 232332 is 232332.000000