How do you print two items on the same line in lisp?

Question

I am looking for something like:

(printem 1 2) 1 2

I assume you do this with a format call, but the examples don't focus on this. Or maybe you write to a string and output that? But that doesn't seem right either.

Why do you put apostrophes ' before numbers? Non-cons values (atoms) evaluate to themselves. — coredump
– coredump, Commented Feb 3, 2016 at 20:57

coredump · Accepted Answer · 2021-08-29 10:27:44Z

In Common Lisp you can write:

(format t "~d ~d~%" 1 2)

See A Few FORMAT Recipes from Peter Seibel's Practical Common Lisp (other chapters might interest you too).

Frank Zalkow · Accepted Answer · 2016-02-04 11:46:58Z

You can simply build a function that prints all its arguments by the iteration construct of format.

(defun printem (&rest args) (format t "~{~a~^ ~}" args))

Usage:

CL-USER> (printem 1 2 3) 1 2 3 CL-USER> (printem '(1 2 3) '(4 5 6)) (1 2 3) (4 5 6)

Diogo Franco · Accepted Answer · 2016-02-04 11:44:09Z

The function you want could be written like

(defun printem (&rest args) (dolist (el args) (princ el) (princ #\SPACE))) >> (printem 1 2) 1 2

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