edit
( 'filename --- )
This word shells to the OS to execute the editor specified in
the global C variable editor. The default is EMACS, except for
Coherent where the name is "me". Usage is:
{ filename} here edit
or
" filename" edit
Once the filename has been specified in the first edit, simply use
here to edit the same file again. Use system to use
another editor at run-time.
else
( --- )
"else". Else is the starting execution point for the FALSE portion
of an if statement. Its usage is:
: aword if ." true" else ." false" then ;
Use only within a colon definition. See if.
emit
( c --- )
"emit". Type the character on the top of the stack to the
screen.
65 emit
displays an `A'.
endcase
( n --- )
"end-case". Close a case conditional statement.
endif
( --- )
"end-if". A synonym for then.
Terminate an if statement. endif is the branch
point for exiting the conditional. See if.
It
is used in the
form"
: aword if true_words else false_words endif ;
: bword if true_words endif ;
The if statement and its parts can only be used in a colon
definition.
endof
( n --- )
"end-of". Close the of portion of a case conditional statement.
execute
( 'word --- )
"execute". Execute the word whose address, 'word, is on the
top of the stack. Used in the form:
' aword execute
Some Forths expect the CFA and others expect the PFA. Until uses the
WA, which is the address of the dictionary entry structure. In the
case where ' returns the CFA and expect requires the PFA, the
word >body must
be used to convert the CFA to the PFA. This is
not required by Until.
exit
( --- )
"exit". This word presently does nothing at the present. Someday, it
will exit from the currently executing word.
expect
( addr len --- )
"expect". Read up to len characters from the keyboard
into the buffer pointed to by addr. Input is terminated either
by a <CR> or len bytes being read. The number of bytes input
can be obtained from the system variable span.
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