By default, when ending in an operator, use it with the neutral element of that operator

[Former user]

Sometimes I write things like:

1000+500+

and I get a compiling error. It would be really useful that, if the input ends on an operator, it's assumed that (if possible) it's used with the neutral element of that operator, so that the equation written is interpreted as:

1000+500+0

Or that

1000500

is interpreted as

10005001