Use rand in golang to generate random non-repeating numbers

In Golang, there are two packages that provide rand, namely "math/rand" and "crypto/rand", corresponding to two application scenarios.

1. The "math/rand" package implements a pseudo-random number generator. That is, generating integers and floating point types.

2. The "crypto/rand" package implements a more secure random number generator for encryption and decryption.

Use rand in golang to generate random non-repeating numbers:

package test import ( "fmt" "math/rand" "time" ) //生成若干个不重复的随机数 func RandomTestBase() { //测试5次 for i := 0; i < 5; i++ { nums := generateRandomNumber(10, 30, 10) fmt.Println(nums) } } //生成count个[start,end)结束的不重复的随机数 func generateRandomNumber(start int, end int, count int) []int { //范围检查 if end < start || (end-start) < count { return nil } //存放结果的slice nums := make([]int, 0) //随机数生成器，加入时间戳保证每次生成的随机数不一样 r := rand.New(rand.NewSource(time.Now().UnixNano())) for len(nums) < count { //生成随机数 num := r.Intn((end - start)) + start //查重 exist := false for _, v := range nums { if v == num { exist = true break } } if !exist { nums = append(nums, num) } } return nums }

Output result:

[12 20 18 19 21 28 15 13 11 10]

[28 15 12 10 20 18 16 24 27 17]

[25 28 29 19 21 12 16 13 11 15]

[27 20 19 23 18 13 21 24 12 26]

[19 10 27 18 28 12 22 14 16 26]

Recommended:golang tutorial

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