forked from golang/hotime
101 lines
2.3 KiB
Go
101 lines
2.3 KiB
Go
package util
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import (
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"math"
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"reflect"
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"strconv"
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"strings"
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"unsafe"
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)
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// 字符串转Int
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// intStr：数字的字符串
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func String2Int(intStr string) (intNum int) {
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intNum, _ = strconv.Atoi(intStr)
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return
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}
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// 字符串转Int64
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// intStr：数字的字符串
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func String2Int64(intStr string) (int64Num int64) {
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intNum, _ := strconv.Atoi(intStr)
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int64Num = int64(intNum)
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return
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}
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// 字符串转Float64
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// floatStr：小数点数字的字符串
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func String2Float64(floatStr string) (floatNum float64) {
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floatNum, _ = strconv.ParseFloat(floatStr, 64)
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return
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}
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// 字符串转Float32
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// floatStr：小数点数字的字符串
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func String2Float32(floatStr string) (floatNum float32) {
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floatNum64, _ := strconv.ParseFloat(floatStr, 32)
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floatNum = float32(floatNum64)
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return
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}
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// Int转字符串
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// intNum：数字字符串
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func Int2String(intNum int) (intStr string) {
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intStr = strconv.Itoa(intNum)
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return
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}
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// Int64转字符串
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// intNum：数字字符串
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func Int642String(intNum int64) (int64Str string) {
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//10, 代表10进制
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int64Str = strconv.FormatInt(intNum, 10)
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return
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}
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// Float64转字符串
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// floatNum：float64数字
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// prec：精度位数（不传则默认float数字精度）
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func Float64ToString(floatNum float64, prec ...int) (floatStr string) {
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if len(prec) > 0 {
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floatStr = strconv.FormatFloat(floatNum, 'f', prec[0], 64)
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return
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}
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floatStr = strconv.FormatFloat(floatNum, 'f', -1, 64)
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return
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}
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// Float32转字符串
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// floatNum：float32数字
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// prec：精度位数（不传则默认float数字精度）
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func Float32ToString(floatNum float32, prec ...int) (floatStr string) {
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if len(prec) > 0 {
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floatStr = strconv.FormatFloat(float64(floatNum), 'f', prec[0], 32)
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return
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}
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floatStr = strconv.FormatFloat(float64(floatNum), 'f', -1, 32)
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return
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}
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// 二进制转10进制
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func BinaryToDecimal(bit string) (num int) {
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fields := strings.Split(bit, "")
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lens := len(fields)
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var tempF float64 = 0
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for i := 0; i < lens; i++ {
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floatNum := String2Float64(fields[i])
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tempF += floatNum * math.Pow(2, float64(lens-i-1))
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}
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num = int(tempF)
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return
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}
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// BytesToString 0 拷贝转换 slice byte 为 string
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func BytesToString(b []byte) (s string) {
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_bptr := (*reflect.SliceHeader)(unsafe.Pointer(&b))
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_sptr := (*reflect.StringHeader)(unsafe.Pointer(&s))
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_sptr.Data = _bptr.Data
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_sptr.Len = _bptr.Len
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return s
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}
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