math

func AbsInt8 ¶

func AbsInt8(n int8) int8

AbsInt8 gets absolute value of int8.

Example 1: AbsInt8(-5) -5 code value as below original code 1000,0101 inverse code 1111,1010 complement code 1111,1011 Negative numbers are represented by complement code in memory. shifted = n >> 7 = (1111,1011) >> 7 = 1111,1111 = -1(10-base) (负数右移，左补1)

1111,1011

n xor shifted = ----------- = 0000,0100 = 4(10-base)

1111,1111

(n ^ shifted) - shifted = 4 - (-1) = 5

Example 2: AbsInt8(5) 5 code value as below original code 0000,0101 Positive numbers are represented by original code in memory, and the XOR operation between positive numbers and 0 is equal to itself. shifted = n >> 7 = 0

0000,0101

n xor shifted = ----------- = 0000,0101 = 5(10-base)

0000,0000

(n ^ shifted) - shifted = 5 - 0 = 5

func AbsInt16 ¶

func AbsInt16(n int16) int16

AbsInt16 gets absolute value of int16.

func AbsInt32 ¶

func AbsInt32(n int32) int32

AbsInt32 gets absolute value of int32.

func AbsInt64 ¶

func AbsInt64(n int64) int64

AbsInt64 gets absolute value of int64.

func Max ¶ added in v0.0.62

func Max[T cmp.Ordered](x, y T) T

Max compare two values and return larger value. Deprecated: as of go 1.21, please use builtin func max.

func Min ¶ added in v0.0.62

func Min[T cmp.Ordered](x, y T) T

Min compare two values and return smaller value. Deprecated: as of go 1.21, please use builtin func min.

func RandAlphanumeric ¶ added in v0.0.52

func RandAlphanumeric(l int) string

RandAlphanumeric returns a truly random string of the specified length and the contents of which are composed of alphanumeric letters.

func RandBytes ¶ added in v0.0.52

func RandBytes(l uint32) []byte

RandBytes gets a truly random byte slice of the specified length with the value range in [0x00,0xff].

func RandInt ¶

func RandInt() int

RandInt returns a non-negative truly random int number.

func RandIntRange ¶

func RandIntRange(min, max int) int

RandIntRange returns a non-negative truly random int number in [min,max).

func RandIntn ¶

func RandIntn(n int) int

RandIntn returns a non-negative truly random int number in [0,n).

func RandInts ¶ added in v0.0.52

func RandInts(l, max int) []int

RandInts returns a non-negative truly random int specified length slice with the value range in [0,max).

func RandLowerAlphanumeric ¶ added in v0.0.53

func RandLowerAlphanumeric(l int) string

RandLowerAlphanumeric returns a truly random string of the specified length and the contents of which are composed of lowercase letters and numbers.

func RandLowerStr ¶

func RandLowerStr(l uint32) string

RandLowerStr returns a truly random lowercase string of a specified length.

func RandStr ¶

func RandStr(l int) string

RandStr returns a truly random string of the specified length and the contents of which are composed of uppercase and lowercase letters.

func RandUpperStr ¶

func RandUpperStr(l uint32) string

RandUpperStr returns a truly random uppercase string of a specified length.