Simplified Common Lisp reference

Symbol class: Mathematics, Arithmetics, Logic and Comparisons

Syntax:

Symbol type: function

1+number => number

Argument description:

number

numeric value

1+ function adds one to the argument. See +.

(1+ 5) => 6
(1+ 1234567890123456789) => 1234567890123456790
(1+ 1.3) => 2.3
(1+ 1.3d0) => 2.3d0
(1+ #c(2 4)) => #C(3 4)
(1+ 3/4) => 7/4