How to Get Int31 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 every time when 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 the non-negative pseudo-random number of 31-bit integer as an int32 type from the default source with the help of the Int31() 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 Int31() function.

Syntax:

func Int31() int32

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

Example 1:



filter_none

edit
close

play_arrow

link
brightness_4
code

// Golang program to illustrate
// how to get a random number
package main
  
import (
    "fmt"
    "math/rand"
)
  
// Main function
func main() {
  
    // Finding random numbers of int type
    // Using Int31() function
    res_1 := rand.Int31()
    res_2 := rand.Int31()
    res_3 := rand.Int31()
  
    // Displaying the result
    fmt.Println("Random Number 1: ", res_1)
    fmt.Println("Random Number 2: ", res_2)
    fmt.Println("Random Number 3: ", res_3)
}

chevron_right


Output:

Random Number 1:  1298498081
Random Number 2:  2019727887
Random Number 3:  1427131847

Example 2:

filter_none

edit
close

play_arrow

link
brightness_4
code

// Golang program to illustrate the
// use of the random numbers
package main
  
import (
    "fmt"
    "math/rand"
)
  
// Function
func int31random(value_1, value_2 int32) int32 {
    return value_1 + value_2 + rand.Int31()
  
}
  
// Main function
func main() {
  
    // Getting result from int31random() function
    res1 := int31random(2, 9)
    res2 := int31random(47, 20)
    res3 := int31random(400, 98)
  
    // Displaying results
    fmt.Println("Result 1: ", res1)
    fmt.Println("Result 2: ", res2)
    fmt.Println("Result 3: ", res3)
}

chevron_right


Output:

Result 1:  1298498092
Result 2:  2019727954
Result 3:  1427132345



My Personal Notes arrow_drop_up

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.


Article Tags :

Be the First to upvote.


Please write to us at contribute@geeksforgeeks.org to report any issue with the above content.