Expression Eval by Joske

[aurelCB]

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[GWS]

Hi Aurel,

Nice try ..    Joske is a really clever programmer.

If you try the expression 2 * sqrt(7), you will uncover a couple of errors.

Near line 340, you will find bc++ and bo++ which need to be changed to bc = bc + 1, and bo = bo + 1.
(In good old Basic fashion ..  )

Also, it needs a function declaration at the start of the program ..
DECLARE eval_function(name as STRING, expr as STRING)

That gets the program to run and it gives the correct answer - but the output formatting also needs to be changed.
Embedded control characters like '\t' don't work in CB.  It would require chr$(9) for a Tab or chr$(10) for a new line.

Near line 130 this helps format the output ..
result = chr$(10) + expression + chr$(9) + eval_line(expression)

A nice program to play with though ..

best wishes,

Graham