Execute GO Language Online

package main  
import (  
   "sync"  
   "time"  
  "math/rand"  
   "fmt"  
)  
var wait sync.WaitGroup  
var count int  
//var mutex sync.Mutex  
func  increment(s string)  { 
    start := time.Now()
  //  mutex.Lock() 
   for i :=0;i<10;i++ {  
       
      x := count  
      x++;  
    //rand.Seed(time.Now().UnixNano())
      time.Sleep(time.Duration(rand.Intn(10))*time.Millisecond)  
      count = x;  
      fmt.Println(s, i,"Count: ",count,"time taken: ",time.Since(start))  
    
        
   }  
    // mutex.Unlock()  
   wait.Done()  
     
}  
func main(){  
   wait.Add(2)  
   go increment("foo: ")  
   go increment("bar: ")  
   wait.Wait()  
   fmt.Println("last count value " ,count)  
}  























/*import (
    "crypto/rand"
    "fmt"
)

func main() {
    key := [256]byte{}
    _, err := rand.Read(key[:])
    if err != nil {
        panic(err)
    }
    fmt.Println(key)
}*/



/*...........................................................
generating a random number and sequencse
https://flaviocopes.com/go-random/
.......................................................
.......................................................
.....................................................
.....................................................*/

// for concurrency waitgroup is to hold the 
/* import (  
   "fmt"  
   "time"  
   "sync"  
)  
var wg = sync.WaitGroup{}  
  
func main() {  
   wg.Add(2)  
   go fun1()  
   go fun2()  
   wg.Wait()  
}  
func fun1(){  
   for  i:=0;i<10;i++{  
      fmt.Println("fun1,  ->",i)  
      time.Sleep(time.Duration(5*time.Millisecond))  
   }  
   wg.Done()  
}  
func fun2(){  
   for i:=0;i<10;i++{  
      fmt.Println("fun2,  ->",i)  
      time.Sleep(time.Duration(10*time.Millisecond))  
   }  
   wg.Done()  
} */


/*error handling 
......................................................................

import (  
  "fmt"
   "errors"
  //"math"  
  )
  func sqr(value int) (int, error){
      i:=10
      if(value<=0){
     return 0, errors.New("Math: negative number passed to Sqrt")
      }
  //else{
         i=i/value
          return i,nil
    //  }
 }

  func main(){
 //    i:=10
     result,err:=sqr(3)
     if err !=nil{
    fmt.Println(err)
    }else{
       fmt.Println(result)
       }
   }*/