Go 语言编程 — 数据类型转换

目录

数据类型转换

类型转换用于将一种数据类型的变量转换为另外一种类型的变量。

格式：

type_name(expression)

[]byte => other type

注：[]byte 为字节流类型。

• []byte => string

string([]byte)

int => other type

• int => string

s = strconv.Itoa(i)

• int => int32

i32 = int32(num)

• int => int64

i64 = int64(num)

• int64/int32 => int

i = int(num)

• int64 => string

strconv.FormatInt(int64, 10)

• int64 => time.Duration

time.Duration(int64)

• int32 => byte

bytes.NewBuffer()

• int => float64

float64(num) 

• other type -> int

int(int32/int64)
int(int64/int32)

string => other type

• string => int

strconv.Atoi(s)

• string => bool

strconv.ParseBool("true")

• string => float32

strconv.ParseFloat(s, 32)

• string => float64

strconv.ParseFloat(s, 64)

• string => uint

strconv.ParseUint()

• string => int32/int64

strconv.ParseInt(s, 10, 32/64)

• string（16进制） => int32/int64

strconv.ParseInt(s, 0, 32/64)

• string => []byte

[]byte(string)

other type => string

• int,int32,int64 => string

str1 := fmt.Sprintf("%d", i)            // int/int32/int64
str3 := strconv.FormatInt(int64(i), 10) // int/int32/int64
str2 := strconv.Itoa(i)                 // int

• uint64 => string

strconv.FormatUint(unit64, 10)

• bool => string

strconv.FormatBool(true)

• float64 => string

strconv.FormatFloat(float64(12), 'f', -1, 64) 
fmt.Sprintf("%.2f", float64)

array => slice

copy(array[:], slice[0:4])
copy(array[:], slice)

for index, b := range someSlice {
	array[index] = b
}