fmtFprintosStdout

fmtFprintosStdout is not a formal function name in the Go standard library. Rather, it denotes the common pattern of sending formatted output to a program’s standard output by calling fmt.Fprint with os.Stdout as the writer. In practice, this idiom is written as fmt.Fprint(os.Stdout, ...), where os.Stdout provides the standard output stream.

The fmt.Fprint function, in the fmt package, has the signature Fprint(w io.Writer, a ...interface{}) (n int, err error). When called with w = os.Stdout, it writes the formatted representation of each argument to the program’s standard output. It does not insert spaces or newlines between arguments automatically; any separators must be included in the arguments themselves. For a trailing newline, you can use fmt.Fprintln or include a newline in the content you pass.

Typical usage examples include fmt.Fprint(os.Stdout, "Hello, ", "world") which prints Hello, world, and fmt.Fprintln(os.Stdout, "Value:", v) which prints Value: followed by the value and a newline. The function returns the number of bytes written and an error, if one occurred. In robust code, the error should be checked rather than ignored.

Compared with fmt.Printf, which formats according to explicit verbs and can include complex formatting, Fprint writes each argument using its default representation and leaves explicit formatting responsibilities to the caller. The choice between Fprint and Fprintln or Printf depends on whether you need raw argument formatting, automatic newlines, or full format directives.