How to solve 'undefined: rand.Seed' error in golang?

During the development or learning process using Golang, we may encounter the error message undefined: rand.Seed. This error usually occurs when you need to use a random number generator, because in Golang you need to set a random number seed before you can use the functions in the rand package. This article will explain how to resolve this error.

1. Introduce the math/rand package

First, we need to introduce the math/rand package into the code. In the Go language, all packages need to be declared with import before they can be used. For example:

import "math/rand"

At this time, we may have used a function of the rand package in the code, but received the error undefined: rand.Seed hint.

2. Set the random number seed

In order to solve this problem, we need to set a random number seed in the code, which will affect the subsequent random number generation. In Golang, you can use the Now() function in the time package to get the current timestamp, and then pass the timestamp as a seed to rand.Seed() Function, for example:

rand.Seed(time.Now().Unix())

In this way, we set a random number seed based on the current time. Based on this seed, we can use various functions in the rand package to generate random numbers. An example is as follows:

rand.Seed(time.Now().Unix())
value := rand.Intn(10)
fmt.Println(value)

In the above code, we first set the random number seed, and then used the rand.Intn(n) function to generate a random number between 0 and 9 number.

3. Summary

When using a random number generator in Golang, you need to set a random number seed first, otherwise the error message undefined: rand.Seed will appear . The solution to this problem is to import the math/rand package, then use the time.Now().Unix() function to generate a random number seed based on the current time, and put this seed Just pass it to the rand.Seed() function. In this way, we can happily use random number generators in Golang.

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