golang tutorial - Golang Random Number | Random Number Generation In Golang
- golang - go programming language - google go - go language - go program - google language
Random number generation is the generation of a sequence of numbers or symbols that cannot be reasonably predicted better than by a random chance, usually through a random-number generator technique or program
Examples of random number generation -
Includes the rolling of dice,
coin flipping,
the shuffling of playing cards,
the use of yarrow stalks
package main
import "time"
import "fmt"
import "math/rand"
func main() {
// For example, rand.Intn returns a random int n, 0 <= n < 100.
fmt.Print(rand.Intn(100), ",")
fmt.Print(rand.Intn(100))
fmt.Println()
// rand.Float64 returns a float64 f, 0.0 <= f < 1.0.
fmt.Println(rand.Float64())
// This can be used to generate random floats in other ranges, for example 5.0 <= f' < 10.0.
fmt.Print((rand.Float64()*5)+5, ",")
fmt.Print((rand.Float64() * 5) + 5)
fmt.Println()
//The default number generator is deterministic, so it’ll produce the same sequence of numbers each time by default. To produce varying sequences, give it a seed that changes. Note that this is not safe to use for random numbers you intend to be secret, use crypto/rand for those.
s1 := rand.NewSource(time.Now().UnixNano())
r1 := rand.New(s1)
/// Call the resulting rand.Rand just like the functions on the rand package.
fmt.Print(r1.Intn(100), ",")
fmt.Print(r1.Intn(100))
fmt.Println()
//// If you seed a source with the same number, it produces the same sequence of random numbers.
s2 := rand.NewSource(42)
r2 := rand.New(s2)
fmt.Print(r2.Intn(100), ",")
fmt.Print(r2.Intn(100))
fmt.Println()
s3 := rand.NewSource(42)
r3 := rand.New(s3)
fmt.Print(r3.Intn(100), ",")
fmt.Print(r3.Intn(100))
}
click below button to copy the code. By - golang tutorial - team
golang , gopro , google go , golang tutorial , google language , go language , go programming language
Output for the above go program is :
$ go run random-numbers.go
81,87
0.6645600532184904
7.123187485356329,8.434115364335547
0,28
5,87
5,87
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