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autosimplify(2);
expr(integer); returns expr(2);

Why does not returns 2?

expr(integer); => 2

expr expects a string (or 2 args like expr(sin,x), cf. example)

Mr. Bernard, pleasse add the option that if the entry in a number, or if it is a variable, returns the final value, for example, it serves to determine the value of the reserved variables, since eval, does not give the final value anymore be. eval(DOM_INT) => DOM_INT

expr(DOM_INT); => 2
the trick DOM_INT+0 => 2 is not so intuitive

That's your opinion, not mine!

It is not my point of view, it is the opinion of several students.

We use your software in engineering for the teaching of mathematics, not for technical or scientific calculation, for that this $ matlab, mathematica, maple

Can you give me an example where you need the numeric value of DOM_INT with your students?