In APL\360 the only way for a program to "gather data" from an outside source was via the (selectric typewriter) terminal the user was working at - and if a program wanted to "request input" the quad symbol was used to open a prompt that let the user type in numbers or an expression. If the program wanted a literal string/vector, the quad symbol overstruck with a quote was available (not requiring the user to quote the string) - hence Quote Quad was used for literal input.
At 10:33 +0900 2009/08/23, June Kim wrote: >There was a magazine for APL-like languages : APL Quote Quad >http://www.sigapl.org/qq.htm > >I have much pleasure mining through the Quote Quad archives. However, >I don't know the meaning of the title. > >I think "Quote Quad" has a special meaning to APL community. What is it? >---------------------------------------------------------------------- >For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
