It says:
Printf formats according to a format specifier and writes to standard output. It returns the number of bytes written and any write error encountered.
How do I create/test an error and show the error if it is stored in b when I run the program it shows "nil" since no error, how can i show any error?
a,b :=fmt.Println("Hello, playground")
fmt.Println(a)
fmt.Println(b)
https://golang.org/pkg/fmt/#Println
func Println(a ...interface{}) (n int, err error)
https://play.golang.org/p/8Cjb2Sfunx7
It is unusual to have Println errors, the docs also this. But if you are really interesting in doing a test of it, it works:
package main
import (
"fmt"
"os"
"log"
)
func main() {
const name, age = "Kim", 22
os.Stdout.Close()
_, err := fmt.Println(name, "is", age, "years old.")
log.Fatal(err)
}
In order to artificially trigger an error we are closing the default Stdout file, used by Println. See the os documentation.