英文:
The binary representation of unsigned integer in Go
问题
有没有内置的函数可以将uint转换为二进制整数的切片{0,1}？
>> convert_to_binary(2)
[1, 0]
英文:
Is there a built-in function to convert a uint to a slice of binary integers {0,1} ?
>> convert_to_binary(2)
[1, 0]
答案1
得分: 2
我不知道有这样的函数，但是你可以使用strconv.FormatUint来实现这个功能。
示例（在play上）：
func Bits(i uint64) []byte {
bits := []byte{}
for _, b := range strconv.FormatUint(i, 2) {
bits = append(bits, byte(b - rune('0')))
}
return bits
}
FormatUint会将给定的uint转换为指定进制的字符串表示，这里是二进制。所以对于i=2，返回的字符串是"10"。在字节中，这表示为[49 48]，因为1在ASCII和Unicode中表示为49，0表示为48。所以我们只需要遍历字符串，将每个字符（rune）减去48，并将其转换为字节即可。
英文:
I am not aware of such a function, however you can use strconv.FormatUint for that purpose.
Example (on play):
func Bits(i uint64) []byte {
bits := []byte{}
for _, b := range strconv.FormatUint(i, 2) {
bits = append(bits, byte(b - rune('0')))
}
return bits
}
FormatUint will return the string representation of the given uint to a base, in this case 2, so we're encoding it in binary. So the returned string for i=2 looks like this: "10". In bytes this is [49 48] as 1 is 49 and 0 is 48 in ASCII and Unicode. So we just need to iterate over the string, subtracting 48 from each rune (unicode character) and converting it to a byte.
答案2
得分: 0
这是另一种方法：
package main
import (
"bytes"
"fmt"
"math/bits"
)
func unsigned(x uint) []byte {
b := make([]byte, bits.UintSize)
for i := range b {
if bits.LeadingZeros(x) == 0 {
b[i] = 1
}
x = bits.RotateLeft(x, 1)
}
return b
}
func trimUnsigned(x uint) []byte {
return bytes.TrimLeft(unsigned(x), string(0))
}
func main() {
b := trimUnsigned(2)
fmt.Println(b) // [1 0]
}
https://golang.org/pkg/math/bits#LeadingZeros
英文:
Here is another method:
package main
import (
"bytes"
"fmt"
"math/bits"
)
func unsigned(x uint) []byte {
b := make([]byte, bits.UintSize)
for i := range b {
if bits.LeadingZeros(x) == 0 {
b[i] = 1
}
x = bits.RotateLeft(x, 1)
}
return b
}
func trimUnsigned(x uint) []byte {
return bytes.TrimLeft(unsigned(x), string(0))
}
func main() {
b := trimUnsigned(2)
fmt.Println(b) // [1 0]
}
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论