You may need to dlimit argument to 1!:2 ,eg y 1!:2[2 or y 1!:2 ]2 or y 1!:2(2) or y (1!:2) 2
For what is worth, C, similar to J, does not have any i/o instructions in its core language. All i/o are supposed to be done by external i/o library. You can try the ncurses addons for text mode interface. Чтв, 29 Дек 2011, PackRat писал(а): > Most well known programming languages have a built-in command to get > data entered on the keyboard by the user (e.g., input, etc.) and > another built-in command to send/display data to the screen (e.g., > print, etc.). However, these "simple" commands SEEM nonexistent or > nearly impossible in J. > > For example, from "Learning J" and the Dictionary, I learned that > keyboard input could be accomplished via the foreign conjunction 1!:1 1 > and that output to the screen could be done via 1!:2 2. I had thought > to write cover verbs along these lines: > > input=: 3 : 0 > y > entry=. 1!:1 1 > ) > > display=: 3 : 0 > y 1!:2 2 > ) > > I thought I could then use something similar to these lines of code: > > d=. input 'enter something' > display d > > However, regarding keyboard input, the Dictionary states that 1!:1 1 > "read from the keyboard (does not work within a script)". Well, for > pete's sake, what then DOES work within a script? > > Regarding keyboard output, when I use the foreign conjunction above (in > the "display" cover verb) to display output, I get the following error: > > |rank error: display > | y 1!:2 2 > > I get the same error with a direct call to the conjunction: > > |rank error: txttest > | 'Hello, world!' 1!:2 2 > > These are usually the first and easiest commands a beginner learns in > virtually every programming language. Based on the above, J seems not > to fit this paradigm. > > This is the first time I've tried to write some somewhat interactive > code in J between the user and the program. How in the world does one > implement these absolutely BASIC commands in J? I'm trying to get > simple user input (NOT using complicated forms) to create calls to one > of several explicit verbs within a script. Any help, please, with > this? Many thanks in advance! > > > Harvey > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
