To print CoCoA output to a file, one first opens the file
with 'OpenOFile' then prints to the file using 'Print On'.
To receive verbatim input from a file, one first opens the file with
'OpenIFile', then gets characters from the file with 'Get'. Actually,
'Get' gets a list of ascii codes for the characters in the file.
These can be converted to real characters using the function 'Ascii'.
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D := OpenOFile('my-file'); -- open text file with name 'my-file',
-- creating it if necessary
Print 'hello world' On D; -- append 'hello world' to my-file
Close(D); -- close the file
D := OpenIFile('my-file'); -- open 'my-file'
Get(D,10); -- get the first ten characters, in ascii code
[104, 101, 108, 108, 111, 32, 119, 111, 114, 108]
-------------------------------
Ascii(It); -- convert the ascii code
hello worl
-------------------------------
Close(D);
To read and execute a sequence of CoCoA commands from a text file, one
uses the 'Source' command, or equivalently '<<'. For instance, if the
file 'MyFile.coc' contains a list of CoCoA commands, then
<<'MyFile.coc';
reads and executes the commands.
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