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How to Get Int31 Type Random Number in Golang?
  • Last Updated : 26 Mar, 2020
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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:






// 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)
}

Output:

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

Example 2:




// 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)
}

Output:

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

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