package main import ( "fmt" "os" "strconv" ) func main() { c, _ := strconv.ParseFloat(os.Args[1], 64) f := c*1.8 + 32 // Like this: fmt.Printf("%g ºC is %g ºF\n", c, f) // Or just like this (both are correct): fmt.Printf("%g ºF\n", f) }