Hello World

Here's the traditional first program:

	use(io).
	print("Hello World\n")

What do we see here? Here are some of the important points:

use(io) loads the input/output library. This declares the print function among other things.
print("Hello World\n") is a function call. Its one parameter is a string literal which uses the 'C' style \nnotation for newline.
The . character is used to separate a declaration (the use expression) from the body expression (the print expression).

Compiling and Executing

Note: you need to set some environment variables before using the LARD tools. Please refer to the overview section of the compilation tools user guide and the release notes for the version that you're using for details.

Here's how to compile and execute the Hello World example:

	ernie$ lcd hw.l
	ernie$ li hw.bcode run 
	Hello World
	Program terminated

	ernie$

lcd compiles the source lard program into a binary .bcode file.
li interprets the bcode file. The argument run to li tells it to run the program immediately.