How to Get Uint64 Type Random Number in Golang?

Go language provides inbuilt support for generating random numbers of the specified type with the help of a math/rand package. This package implements pseudo-random number generators. These random numbers are generated by a source and this source produces a deterministic sequence of values whenever the program run. And if you want to random numbers for security-sensitive work, then use the crypto/rand package.

You are allowed to generate a pseudo-random number of 64-bit integer as an uint64 type from the default source with the help of the Uint64() function provided by the math/rand package. So, you need to add a math/rand package in your program with the help of the import keyword to access the Uint64() function.

Syntax:

func Uint64() uint64

Let us discuss this concept with the help of the given examples:

Example 1:

// Golang program to illustrate
// how to get a random number
package main

import (
    "fmt"
    "math/rand"
)

// Main function
func main() {

    // Finding random numbers
    // Using Uint64() function
    res_1 := rand.Uint64()
    res_2 := rand.Uint64()
    res_3 := rand.Uint64()

    // Displaying the result
    fmt.Println("Random Number 1: ", res_1)
    fmt.Println("Random Number 2: ", res_2)
    fmt.Println("Random Number 3: ", res_3)
}

Output:

Random Number 1:  5577006791947779410
Random Number 2:  8674665223082153551
Random Number 3:  15352856648520921629

Example 2:

// Golang program to illustrate the
// use of the random numbers
package main

import (
    "fmt"
    "math/rand"
)

// Function
func uint64random(value_1, value_2 uint64) uint64 {
    return value_1 + value_2 + rand.Uint64()

}

// Main function
func main() {

    // Getting result from uint32random() function
    res1 := uint64random(10, 3)
    res2 := uint64random(44, 59)
    res3 := uint64random(130, 50)

    // Displaying results
    fmt.Println("Result 1: ", res1)
    fmt.Println("Result 2: ", res2)
    fmt.Println("Result 3: ", res3)
}

Output:

Result 1:  5577006791947779423
Result 2:  8674665223082153654
Result 3:  15352856648520921809