(+) and (inc)

[alex]

(+) and (inc)

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newLISP v.8.8.0 on Win32 MinGW, execute 'newlisp -h' for more info.

> (setq num 2147483646)
2147483646
> (+ num 5)
-2147483645
> (inc 'num 5)
2147483651
>
Why?

[cormullion]

Could it be that:

If num is supplied, inc always returns the result as floating point even for integer input arguments.

I notice that

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(add num 5)

also gives 2147483651...