go initial errors "cannot refer to unexported name fmt.printf"

I'm getting started with golang, just recording my initial hiccups and the solutions.

cannot refer to unexported name fmt.printf

hello/hello.go:6: undefined: fmt.printf

Golang is case sensitive , hence the function is fmt.Printf , with a capital P.

In Go, a name is exported if it begins with a capital letter. For example, Pizza is an exported name, as is Pi, which is exported from the math package.