Print itself
Create a program, which prints its source code to the stdout!
DO NOT USE the source file of the program! It is the running program itself which has to contain it's source code somehow, without reading the source file!
- Related task
Furor
A very short solution, using some special features of Furor: <lang Furor> "#s sto selfstring QUOTE @selfstring dup print QUOTE NL printnl end { „selfstring” }"
- s sto selfstring QUOTE @selfstring dup print QUOTE NL printnl end { „selfstring” }
</lang> And behold, here is a more complex but "traditional" solution of this famous task, solved by 3 loops: <lang Furor>
- g §vége §eleje - tokensize / sto maxlines
- s
7 {| {} §eleje[] printnl |}
@maxlines {| {} §eleje[] QUOTE print QUOTE NL |}
7 @maxlines {|| {} §eleje[] printnl |} end eleje: "#g §vége §eleje - tokensize / sto maxlines" "#s" "7 {| {} §eleje[] printnl |}" " @maxlines {| {} §eleje[] QUOTE print QUOTE NL |}" "7 @maxlines {|| {} §eleje[] printnl |}" "end" "eleje:" "vége:" "{ „selfstring” }" "{ „maxlines” }" vége: { „selfstring” } { „maxlines” } </lang>
Go
<lang go>package main
import (
"fmt" "io/ioutil" "log" "os" "path"
)
func main() {
self := path.Base(os.Args[0]) + ".go" bytes, err := ioutil.ReadFile(self) if err != nil { log.Fatal(err) } fmt.Print(string(bytes))
}</lang>
- Output:
Just the invoking line as remainder is, of course, as above.
$ go run self_print.go
REXX
<lang rexx>/*REXX program prints its own multi─line source to the standard output (stdout). */
do j=1 for sourceline() call lineout , sourceline(j) end /*j*/ /*stick a fork in it, we're all done. */</lang>
Wren
<lang ecmascript>import "os" for Process import "io" for File
var args = Process.allArguments System.write(File.read(args[1]))</lang>
- Output:
Just the invoking line as remainder is, of course, as above.
$ wren self_print.wren