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(read-char [file-descriptor])


Read a single character.


This function reads a single character from the file or keyboard. When a file-descriptor is included (as assigned by the read-char reads from the keyboard. ]

The read-char function doesn't actually return the letter, rather it returns the ASCII code of that letter. To actually see the letter, you must convert the ASCII code using the chr function.

Examples

For the following example, assume the file sample.lsp exists, and the first line is "C:\Sample\First.txt".

Code Returns
(setq file (open "sample.lsp" "r"))  
(setq c (read-char file)) 67
(setq a (chr c)) "C"
   
(read-char)
[press A]
Waits for you to press a key.
65

(read-line [file-descriptor])

(setq symbol1 statement1 [symbol2 statement2] ...)

(write-char character [file-descriptor])

LISP Compatibility

Programming Overview of LISP (LISt Processing) Language

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