《通链参考手册》


Function +

●语法设定:

+ &rest numbers => sum

●参数和值:

number---a number.

sum---a number.

●详情:

Returns the sum of numbers, performing any necessary type conversions in the process. If no numbers are supplied, 0 is returned.

●例子:

 (+) =>  0
 (+ 1) =>  1
 (+ 31/100 69/100) =>  1
 (+ 1/5 0.8) =>  1.0

●受制于: 无。

●例外情况:

Might signal type-error if some argument is not a number. Might signal arithmetic-error.

●更多信息:

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)

●说明: 无。


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