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# How to generate random numbers in Go language

Shubham Singh Kshatriya

### Overview

The Go language provides a built-in package named math/rand for generating pseudo-random numbers.

Pseudo-random numbers are a deterministic sequence that depends on a seed value. To generate random numbers on every execution, we need to set the seed every time.

In this shot, we will use the math/rand package to generate a random number.

### Syntax

rand.Int()

rand.Intn(n)

rand.Float64()

• rand.Int(): Returns a random integer.
• rand.Intn(n): Accepts one argument, n (the upper bound), and will throw an error if the value of n is less than zero. rand.Intn(n) returns a random integer between 0 and n.
• rand.Float64(): Returns a random float64 number between 0.0 and 1.0.

### Example

package main

import (
"fmt"
"math/rand"
"time"
)

func main() {
// seed to get different result every time
rand.Seed(time.Now().UnixNano())

fmt.Println(rand.Int())
fmt.Println(rand.Int())
fmt.Println(rand.Int())
fmt.Println()
fmt.Println(rand.Intn(50))
fmt.Println(rand.Intn(50))
fmt.Println(rand.Intn(50))
fmt.Println()
fmt.Println(rand.Float64())
fmt.Println(rand.Float64())
fmt.Println(rand.Float64())
}
Random Number Generation

RELATED TAGS

golang
communitycreator

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Shubham Singh Kshatriya
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