Your first GTM module

Let's create a module named 'hello' that can display 'world'.

1. Start the client: mumps -dir
2. Edit the file "hello": zed "hello"
3. Write this code:  say w "hello",! q
4. Save: :wq
5. Compile: zl
6. Run the code: d say^hello
7. Enjoy !

The code in an indented version

say
  w "hello",!
  q

Here's the session:

#GTM] zed "hello"
[ INSIDE  YOUR $EDITOR ]
[ you save the file    ]
[ and quits the editor ]
#GTM] zl
#GTM] d say^hello
world

#GTM]

Some explanations:

say                   ; Name of the label
  w "hello",!         ; w[rite] the string "hello" followed by end of line: '!'
  q                   ; q[uit] return the control to the caller

You can use the fully qualified name for functions:

say                   ; Name of the label
  write "hello",!     ; w[rite] the string "hello" followed by end of line: '!'
  quit                ; q[uit] return the control to the caller