Numeral systems - hexadecimal

        package main

        import "fmt"

        func main() {
            //    fmt.Printf("%d - %b - %x \n", 42, 42, 42)
           //    fmt.Printf("%d - %b - %#x \n", 42, 42, 42)
          //    fmt.Printf("%d - %b - %#X \n", 42, 42, 42)
            fmt.Printf("%d \t %b \t %#X \n", 42, 42, 42)
       }

Run{:.button.button--outline-success.button--pill}

output:

```   
   42      101010      0X2A 
```

in above program the annotation verb %x formats a number in hexadecimal Ex:- which represent 0X2A ( base 16 format)

integer to hexadecimal cheatsheet:

%x    base 16, with lower-case letters for a-f
    %x    base 16, with upper-case letters for a-f