Update document

README.md

@@ -43,21 +43,27 @@ func main() {
 ### Usage of [mt][github.com/goark/mt/v2].PRNG type (concurrency-safe version)
 
 ```go
+package main
+
 import (
     "fmt"
 
     "github.com/goark/mt/v2"
     "github.com/goark/mt/v2/mt19937"
 )
 
-fmt.Println(mt.New(mt19937.New(19650218)).Uint64())
-//Output:
-//13735441942630277712
+func main() {
+    fmt.Println(mt.New(mt19937.New(19650218)).Uint64())
+    //Output:
+    //13735441942630277712
+}
 ```
 
 #### Use [io].Reader interface
 
 ```go
+package main
+
 import (
     "encoding/binary"
     "fmt"

mt19937/mt19937.go

@@ -120,11 +120,6 @@ func (s *Source) Uint64() uint64 {
 	return x
 }
 
-// // Int63 generates a random number on [0, 2^63-1]-interval
-// func (s *Source) Int63() int64 {
-// 	return (int64)(s.Uint64() >> 1)
-// }
-
 // Real generates a random number
 // on [0,1)-real-interval if mode==1,
 // on (0,1)-real-interval if mode==2,

sample/sample2.go

@@ -5,7 +5,7 @@ package main
 
 import (
 	"fmt"
-	stdrand "math/rand/v2"
+	"math/rand/v2"
 	"sync"
 	"time"
 
@@ -16,7 +16,7 @@ import (
 func main() {
 	start := time.Now()
 	wg := sync.WaitGroup{}
-	prng := mt.New(mt19937.New(stdrand.Int64()))
+	prng := mt.New(mt19937.New(rand.Int64()))
 	for i := 0; i < 1000; i++ {
 		wg.Add(1)
 		go func() {