How to get int63 type random number in Go language?

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 63-bit integer as an int64 type from the default source with the help of the Int63() 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 Int63() function.

Syntax:

func Int63() int64

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 int63 type 
    // Using Int63() function 
    res_1 := rand.Int63() 
    res_2 := rand.Int63() 
    res_3 := rand.Int63() 
  
    // 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:  6129484611666145821

Example 2:

// Golang program to illustrate 
// the use of the random numbers 
package main 
  
import ( 
    "fmt"
    "math/rand"
) 
  
// Function 
func int63random(value_1, value_2 int64) int64 { 
    return value_1 + value_2 + rand.Int63() 
  
} 
  
// Main function 
func main() { 
  
    // Getting result from Int63random() function 
    res1 := int63random(10, 3) 
    res2 := int63random(430, 56) 
    res3 := int63random(13, 500) 
  
    // Displaying results 
    fmt.Println("Result 1: ", res1) 
    fmt.Println("Result 2: ", res2) 
    fmt.Println("Result 3: ", res3) 
} 

Output:

Result 1:  5577006791947779423
Result 2:  8674665223082154037
Result 3:  6129484611666146334

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