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