程式語言 - GnuCOBOL - Hello, world!

參考資訊：
https://gnucobol.sourceforge.io/

main.cob

       IDENTIFICATION DIVISION.
       PROGRAM-ID. MAIN.
      *---------------------------
       DATA DIVISION.
      *---------------------------
       PROCEDURE DIVISION.
       DISPLAY 'Hello, world!'.
       STOP RUN.

編譯、執行

$ cobc -x main.cob
$ ./main
	Hello, world!