+ | Function |
+ &rest numbers → sum
number — a number.
sum — a number.
Returns the sum of numbers, performing any necessary type conversions in the process. If no numbers are supplied, 0
is returned.
(+) → 0 (+ 1) → 1 (+ 31/100 69/100) → 1 (+ 1/5 0.8) → 1.0
Might signal type-error if some argument is not a number. Might signal arithmetic-error.
Section 12.1.1 (Numeric Operations), Section 12.1.3 (Rational Computations), Section 12.1.4 (Floating-point Computations), Section 12.1.5 (Complex Computations)